/* ========================================
   ChessOK - Base Styles
   Arcade-inspired, clean design
   ======================================== */

/* CSS Variables */
:root {
    /* Colors - Light Theme (Default) */
    --color-bg-primary: #f5f1ea;
    --color-bg-secondary: #fbf8f2;
    --color-bg-tertiary: #efe7dc;
    --color-bg-card: #fffaf2;

    --color-accent-primary: #e94560;
    --color-accent-secondary: #0f9b8e;
    --color-accent-warning: #f39c12;
    --color-accent-success: #27ae60;
    --color-accent-error: #c0392b;

    --color-text-primary: #2b2a27;
    --color-text-secondary: #5b554d;
    --color-text-muted: #7a736b;

    --color-border: #e2d9cc;
    --color-border-light: #eee6da;

    --btn-arcade-shadow-primary: #c94a5d;
    --btn-arcade-shadow-secondary: #efe7dc;

    /* Typography */
    --font-display: 'Gowun Dodum', 'Noto Sans KR', sans-serif;
    --font-body: 'Gowun Dodum', 'Noto Sans KR', sans-serif;
    --font-chat: var(--font-body);
    --letter-spacing-normal: -0.02em;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    /* Shadows */
    --shadow-sm: 0 2px 6px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 6px 14px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 12px 24px rgba(0, 0, 0, 0.18);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;

    /* Layout */
    --navbar-height: 60px;
    --footer-height: 50px;
    --content-max-width: 1200px;
    --safe-bottom: env(safe-area-inset-bottom, 0px);
    --safe-left: env(safe-area-inset-left, 0px);
    --safe-right: env(safe-area-inset-right, 0px);
    --z-mobile-tabbar: 999;
    --z-floating: 1050;
    --z-modal: 1300;
    --z-toast: 1400;
    --z-status-badge: 1450;
    --brand-checker-light: rgba(233, 69, 96, 0.045);
    --brand-checker-dark: rgba(15, 155, 142, 0.038);
}

/* Dark Theme */
html[data-theme="dark"] {
    /* Midnight blue tuned palette */
    --color-bg-primary: #0a1424;
    --color-bg-secondary: #121f35;
    --color-bg-tertiary: #1a2b45;
    --color-bg-card: #15253c;

    --color-accent-primary: #38bdf8;
    --color-accent-secondary: #0ea5e9;
    --color-accent-warning: #f59e0b;
    --color-accent-success: #10b981;
    --color-accent-error: #ef4444;

    --color-text-primary: #e6edf7;
    --color-text-secondary: #bfd0e7;
    --color-text-muted: #8fa7c7;

    --color-border: #2f4467;
    --color-border-light: #3f5a85;

    --btn-arcade-shadow-primary: #0369a1;
    --btn-arcade-shadow-secondary: #1e293b;

    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 12px 24px rgba(0, 0, 0, 0.6);
    --brand-checker-light: rgba(56, 189, 248, 0.06);
    --brand-checker-dark: rgba(14, 165, 233, 0.04);
}

/* Reset */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* Base */
html {
    font-size: clamp(14px, 1.1vw + 10px, 16px);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-display);
    font-weight: 400;
    line-height: 1.6;
    letter-spacing: var(--letter-spacing-normal);
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    position: relative;
    isolation: isolate;
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: -1;
    background:
        radial-gradient(circle at top left, rgba(255, 255, 255, 0.52), transparent 26%),
        linear-gradient(135deg, var(--brand-checker-light) 0 25%, transparent 25% 50%, var(--brand-checker-dark) 50% 75%, transparent 75% 100%);
    background-size: 100% 100%, 28px 28px;
    opacity: 0.42;
}

/* A11y: keyboard navigation visibility */
:focus-visible {
    outline: 2px solid var(--color-accent-secondary);
    outline-offset: 2px;
}

/* Respect reduced motion preference */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

button,
input,
select,
textarea {
    font-family: inherit;
    letter-spacing: inherit;
}

/* Chat uses body font for readability */
.chat-container,
.chat-messages,
.chat-message,
.chat-nickname,
.chat-bubble,
.chat-input,
.chat-time,
.chat-notice {
    font-family: var(--font-chat);
}

/* Mobile Chat Toggle */
.mobile-tabbar {
    display: none;
}

@media (max-width: 768px) {
    .mobile-tabbar {
        position: fixed;
        left: 0;
        right: 0;
        bottom: 0;
        display: flex;
        justify-content: center;
        gap: var(--space-sm);
        padding: var(--space-sm) max(var(--space-md), var(--safe-right)) var(--space-sm) max(var(--space-md), var(--safe-left));
        padding-bottom: max(var(--space-sm), var(--safe-bottom));
        background-color: var(--color-bg-secondary);
        border-top: 1px solid var(--color-border);
        z-index: var(--z-mobile-tabbar);
    }

    .mobile-tab {
        position: relative;
        border: 1px solid var(--color-border);
        background: var(--color-bg-secondary);
        color: var(--color-text-primary);
        padding: var(--space-sm) var(--space-md);
        border-radius: var(--radius-md);
        font-size: 0.875rem;
        font-family: var(--font-display);
        cursor: pointer;
    }

.mobile-tab.active {
        border-color: var(--color-accent-primary);
        color: var(--color-accent-primary);
        font-weight: 700;
        box-shadow: inset 0 -2px 0 var(--color-accent-primary);
    }

    .mobile-tab-badge {
        position: absolute;
        top: -6px;
        right: -6px;
        min-width: 16px;
        height: 16px;
        border-radius: 999px;
        background-color: var(--color-accent-primary);
        color: #fff;
        font-size: 0.625rem;
        display: flex;
        align-items: center;
        justify-content: center;
        padding: 0 4px;
    }

    body.has-mobile-tabbar .main-content {
        padding-bottom: calc(64px + var(--safe-bottom));
    }

    .chat-input {
        font-size: 16px;
    }
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 400;
    line-height: 1.3;
    margin-bottom: var(--space-md);
}

h1 { font-size: clamp(1.2rem, 2.2vw, 1.5rem); }
h2 { font-size: clamp(1rem, 1.8vw, 1.25rem); }
h3 { font-size: clamp(0.9rem, 1.4vw, 1rem); }
h4 { font-size: clamp(0.8rem, 1.2vw, 0.875rem); }

p {
    margin-bottom: var(--space-md);
}

a {
    color: var(--color-accent-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-accent-primary);
}

/* Main Content */
.main-content {
    flex: 1;
    padding: clamp(0.75rem, 2.8vw, var(--space-lg));
    padding-top: calc(var(--navbar-height) + env(safe-area-inset-top, 0px) + clamp(0.75rem, 2.8vw, var(--space-lg)));
    padding-left: max(clamp(0.75rem, 2.8vw, var(--space-lg)), var(--safe-left));
    padding-right: max(clamp(0.75rem, 2.8vw, var(--space-lg)), var(--safe-right));
    width: min(100%, var(--content-max-width));
    margin: 0 auto;
    overflow-x: hidden;
}

/* Footer */
.footer {
    height: auto;
    background-color: var(--color-bg-primary);
    border-top: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-sm) var(--space-md);
}

html[data-theme="dark"] .footer {
    background-color: var(--color-bg-secondary);
}

.footer-content {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    color: var(--color-accent-primary);
    font-size: 0.75rem;
    font-family: var(--font-body);
}

.footer-dev,
.footer-contact {
    white-space: nowrap;
}

@media (max-width: 768px) {
    .footer-content {
        flex-direction: column;
        gap: var(--space-xs);
        text-align: center;
    }

    .footer {
        padding-bottom: calc(var(--space-sm) + 56px + var(--safe-bottom));
    }
}

.footer-logo,
.footer-brand,
.footer-dev,
.footer-contact {
    font-family: var(--font-body);
    font-size: 0.75rem;
    color: var(--color-accent-primary);
}

html:not([data-theme="dark"]) .mobile-tabbar {
    background-color: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
}

html[data-theme="dark"] .mobile-tabbar {
    background-color: var(--color-bg-secondary);
}

html:not([data-theme="dark"]) .mobile-tab {
    background-color: var(--color-bg-card);
    color: var(--color-text-primary);
    border-color: var(--color-border);
}

html:not([data-theme="dark"]) .mobile-tab.active {
    background-color: var(--color-bg-card);
    color: var(--color-accent-primary);
    border-color: var(--color-accent-primary);
}

html:not([data-theme="dark"]) .btn-secondary.btn-arcade {
    box-shadow: 0 4px 0 #e4dbcf;
}

html:not([data-theme="dark"]) .btn-secondary.btn-arcade:hover:not(:disabled) {
    box-shadow: 0 2px 0 #e4dbcf;
}

/* ========================================
   Components
   ======================================== */

/* Buttons */
.btn {
    --btn-tone-bg: var(--color-accent-primary);
    --btn-tone-border: var(--color-accent-primary);
    --btn-tone-color: #ffffff;
    --btn-tone-shadow: rgba(43, 42, 39, 0.14);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    min-height: 46px;
    padding: 0 clamp(0.95rem, 2.1vw, 1.2rem);
    font-family: var(--font-display);
    font-size: clamp(0.8rem, 1.2vw, 0.875rem);
    font-weight: 700;
    line-height: 1;
    border: 1px solid var(--btn-tone-border);
    border-radius: 16px;
    cursor: pointer;
    transition:
        transform var(--transition-fast),
        box-shadow var(--transition-fast),
        background-color var(--transition-fast),
        color var(--transition-fast),
        border-color var(--transition-fast),
        opacity var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
    background: var(--btn-tone-bg);
    color: var(--btn-tone-color);
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.28),
        0 10px 22px -14px var(--btn-tone-shadow);
    position: relative;
    overflow: hidden;
    will-change: transform, box-shadow;
}

.btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(115deg, transparent 12%, rgba(255, 255, 255, 0.24) 38%, transparent 62%);
    transform: translateX(-135%);
    opacity: 0;
    pointer-events: none;
}

.btn:disabled {
    opacity: 0.56;
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

.btn:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.32),
        0 14px 28px -16px var(--btn-tone-shadow);
}

.btn:hover:not(:disabled)::after {
    opacity: 1;
    animation: btn-sheen 540ms ease;
}

.btn:active:not(:disabled) {
    transform: translateY(0) scale(0.985);
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.2),
        0 8px 16px -16px var(--btn-tone-shadow);
}

.btn.is-confirmed {
    animation: btn-confirm-pop 420ms cubic-bezier(0.2, 0.9, 0.2, 1);
}

.btn-primary {
    --btn-tone-bg: linear-gradient(180deg, color-mix(in srgb, var(--color-accent-primary) 94%, white) 0%, var(--color-accent-primary) 100%);
    --btn-tone-border: color-mix(in srgb, var(--color-accent-primary) 76%, #90263d);
    --btn-tone-shadow: rgba(220, 76, 102, 0.46);
    --btn-tone-color: #ffffff;
}

.btn-primary:hover:not(:disabled) {
    background: linear-gradient(180deg, #ef4c68 0%, #dc4761 100%);
    border-color: #c53c56;
}

.btn-secondary {
    --btn-tone-bg: linear-gradient(180deg, rgba(255, 255, 255, 0.96) 0%, rgba(247, 240, 231, 0.92) 100%);
    --btn-tone-border: color-mix(in srgb, var(--color-border-light) 88%, white);
    --btn-tone-shadow: rgba(91, 82, 69, 0.18);
    --btn-tone-color: var(--color-text-primary);
}

.btn-secondary:hover:not(:disabled) {
    background: linear-gradient(180deg, rgba(255, 255, 255, 1) 0%, rgba(245, 237, 227, 0.96) 100%);
    border-color: color-mix(in srgb, var(--color-accent-secondary) 34%, white);
}

.btn[aria-pressed="true"],
.btn.is-active {
    border-color: var(--color-accent-primary);
    box-shadow: inset 0 -2px 0 var(--color-accent-primary);
    font-weight: 700;
}

.hero-tier-toggle[aria-expanded="true"],
.tab-btn[aria-selected="true"],
.mobile-tab[aria-selected="true"] {
    border-color: var(--color-accent-primary) !important;
    color: var(--color-accent-primary) !important;
    font-weight: 700 !important;
    box-shadow: inset 0 -2px 0 var(--color-accent-primary);
}

.btn-success {
    --btn-tone-bg: linear-gradient(180deg, color-mix(in srgb, var(--color-accent-success) 94%, white) 0%, var(--color-accent-success) 100%);
    --btn-tone-border: color-mix(in srgb, var(--color-accent-success) 72%, #1f8246);
    --btn-tone-shadow: rgba(46, 166, 97, 0.42);
    --btn-tone-color: #ffffff;
}

.btn-success:hover:not(:disabled) {
    background: linear-gradient(180deg, #2db968 0%, #269f58 100%);
    border-color: #238d4f;
}

.btn-danger {
    --btn-tone-bg: linear-gradient(180deg, color-mix(in srgb, var(--color-accent-error) 92%, white) 0%, var(--color-accent-error) 100%);
    --btn-tone-border: color-mix(in srgb, var(--color-accent-error) 72%, #8f2b23);
    --btn-tone-shadow: rgba(199, 70, 56, 0.44);
    --btn-tone-color: #ffffff;
}

.btn-danger:hover:not(:disabled) {
    background: linear-gradient(180deg, #d55042 0%, #bb4336 100%);
    border-color: #a83c31;
}

.btn-lg {
    min-height: 56px;
    padding: 0 clamp(1.1rem, 2.8vw, var(--space-xl));
    font-size: clamp(0.9rem, 1.4vw, 1rem);
}

.btn-sm {
    min-height: 38px;
    padding: 0 clamp(0.7rem, 1.8vw, 0.95rem);
    font-size: clamp(0.7rem, 1vw, 0.75rem);
}

.btn-xs {
    min-height: 32px;
    padding: 0 0.72rem;
    font-size: 0.68rem;
}

.btn-block {
    width: 100%;
}

.btn-arcade {
    font-family: var(--font-display);
    font-size: 0.875rem;
    letter-spacing: var(--letter-spacing-normal);
    padding: var(--space-md) var(--space-xl);
    box-shadow: 0 4px 0 var(--btn-arcade-shadow-primary, #a3324a);
    transform: translateY(0);
}

.btn-arcade:hover:not(:disabled) {
    transform: translateY(2px);
    box-shadow: 0 2px 0 var(--btn-arcade-shadow-primary, #a3324a);
}

.btn-arcade:active:not(:disabled) {
    transform: translateY(4px);
    box-shadow: none;
}

.btn-secondary.btn-arcade {
    box-shadow: 0 4px 0 var(--btn-arcade-shadow-secondary, #1a2a4a);
}

.btn-secondary.btn-arcade:hover:not(:disabled) {
    box-shadow: 0 2px 0 var(--btn-arcade-shadow-secondary, #1a2a4a);
}

.btn-secondary.btn-arcade:active:not(:disabled) {
    box-shadow: none;
}

.btn-icon {
    font-size: 1.5em;
    vertical-align: middle;
}

/* Form Elements */
.form-group {
    margin-bottom: var(--space-lg);
}

.form-label {
    display: block;
    margin-bottom: var(--space-sm);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
}

.form-input {
    width: 100%;
    padding: var(--space-md);
    font-family: var(--font-body);
    font-size: 1rem;
    color: var(--color-text-primary);
    background-color: var(--color-bg-secondary);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast);
}

@media (max-width: 768px) {
    .form-input {
        font-size: 16px; /* Prevent iOS zoom */
    }
}

.form-input:focus {
    outline: none;
    border-color: var(--color-accent-secondary);
    box-shadow: 0 0 0 3px rgba(15, 155, 142, 0.15);
}

html[data-theme="dark"] .form-input:focus {
    box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.2);
}

.form-input::placeholder {
    color: var(--color-text-muted);
}

.form-input.is-error {
    border-color: var(--color-accent-error);
}

.form-error {
    margin-top: var(--space-xs);
    font-size: 0.75rem;
    color: var(--color-accent-error);
}

.form-hint {
    margin-top: var(--space-xs);
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

/* Cards */
.card {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: clamp(0.75rem, 2.4vw, var(--space-lg));
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.66),
        0 14px 28px rgba(43, 42, 39, 0.06);
}

.card-header {
    margin-bottom: clamp(0.5rem, 2vw, var(--space-lg));
    padding-bottom: clamp(0.35rem, 1.6vw, var(--space-md));
    border-bottom: 1px solid var(--color-border);
}

.card-header--no-divider {
    border-bottom: none;
    padding-bottom: 0;
}

.card-title {
    font-family: var(--font-display);
    font-size: clamp(0.85rem, 1.4vw, 1rem);
    margin-bottom: 0;
}

.season-frame-champion,
.season-frame-runnerup,
.season-frame-third,
.season-frame-top10 {
    position: relative;
}

.season-frame-champion::before,
.season-frame-runnerup::before,
.season-frame-third::before,
.season-frame-top10::before {
    content: "";
    position: absolute;
    inset: -1px;
    border-radius: inherit;
    pointer-events: none;
}

.season-frame-champion::before {
    box-shadow: 0 0 0 2px #f59e0b, 0 0 18px rgba(245, 158, 11, 0.35);
}

.season-frame-runnerup::before {
    box-shadow: 0 0 0 2px #94a3b8, 0 0 14px rgba(148, 163, 184, 0.35);
}

.season-frame-third::before {
    box-shadow: 0 0 0 2px #b45309, 0 0 12px rgba(180, 83, 9, 0.3);
}

.season-frame-top10::before {
    box-shadow: 0 0 0 2px #06b6d4, 0 0 12px rgba(6, 182, 212, 0.26);
}

@media (max-width: 768px) {
    .card {
        padding: var(--space-md);
    }

    .card-header {
        margin-bottom: var(--space-md);
        padding-bottom: var(--space-sm);
    }

    .card-title {
        font-size: clamp(0.9rem, 3vw, 0.95rem);
    }

    .divider {
        margin: var(--space-md) 0;
    }
}

@media (max-width: 1200px) {
    .main-content {
        padding: clamp(0.75rem, 2.6vw, 1.5rem);
        padding-top: calc(var(--navbar-height) + clamp(0.75rem, 2.6vw, 1.5rem));
    }
}

@media (max-width: 900px) {
    .main-content {
        padding: clamp(0.7rem, 2.8vw, 1.25rem);
        padding-top: calc(var(--navbar-height) + clamp(0.7rem, 2.8vw, 1.25rem));
    }
}

@media (max-width: 640px) {
    .main-content {
        padding: clamp(0.6rem, 3vw, 1rem);
        padding-top: calc(var(--navbar-height) + clamp(0.6rem, 3vw, 1rem));
    }
}

/* Divider */
.divider {
    height: 1px;
    background-color: var(--color-border);
    margin: var(--space-lg) 0;
}

/* Toast Container */
#toast-container {
    position: fixed;
    top: calc(var(--navbar-height) + var(--space-md));
    right: var(--space-md);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    animation: toastIn 240ms cubic-bezier(0.22, 0.9, 0.3, 1);
    max-width: 320px;
    font-family: var(--font-body);
    font-size: 0.75rem;
    line-height: 1.5;
    word-break: break-word;
    cursor: pointer;
    transform-origin: top right;
    transition: transform 180ms ease, box-shadow 180ms ease;
    will-change: transform, opacity;
}

.toast:hover {
    transform: translateY(-2px);
    box-shadow: 0 16px 28px rgba(43, 42, 39, 0.15);
}

.toast-icon {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    font-weight: 700;
}

.toast-message {
    flex: 1;
}

.toast-success {
    border-left: 4px solid var(--color-accent-success);
}

.toast-success .toast-icon {
    background-color: var(--color-accent-success);
    color: #fff;
}

.toast-error {
    border-left: 4px solid var(--color-accent-error);
}

.toast-error .toast-icon {
    background-color: var(--color-accent-error);
    color: #fff;
}

.toast-warning {
    border-left: 4px solid var(--color-accent-warning);
}

.toast-warning .toast-icon {
    background-color: var(--color-accent-warning);
    color: #fff;
}

.toast-info {
    border-left: 4px solid var(--color-accent-secondary);
}

.toast-info .toast-icon {
    background-color: var(--color-accent-secondary);
    color: #fff;
}

@keyframes toastIn {
    from {
        opacity: 0;
        transform: translateX(18px) scale(0.96);
    }
    to {
        opacity: 1;
        transform: translateX(0) scale(1);
    }
}

@keyframes slideOut {
    from {
        opacity: 1;
        transform: translateX(0);
    }
    to {
        opacity: 0;
        transform: translateX(100%);
    }
}

@keyframes btn-sheen {
    0% { transform: translateX(-135%); }
    100% { transform: translateX(135%); }
}

@keyframes btn-confirm-pop {
    0% { transform: translateY(0) scale(1); }
    35% { transform: translateY(-1px) scale(1.035); }
    100% { transform: translateY(0) scale(1); }
}

/* Loading Spinner */
.spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.spinner-sm {
    width: 16px;
    height: 16px;
    border-width: 2px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Tier Name Colors */
.tier-name-Beginner { color: #94a3b8; }
.tier-name-Junior { color: #22c55e; }
.tier-name-Intermediate { color: #3b82f6; }
.tier-name-Advanced { color: #a855f7; }
.tier-name-Expert { 
    color: #f59e0b; 
    text-shadow: 0 0 8px rgba(245, 158, 11, 0.3);
    font-weight: 700;
}
.tier-name-Master { 
    color: #ef4444; 
    text-shadow: 0 0 12px rgba(239, 68, 68, 0.5);
    font-weight: 700;
    animation: master-glow 2s ease-in-out infinite alternate;
}

@keyframes master-glow {
    from { text-shadow: 0 0 8px rgba(239, 68, 68, 0.4); }
    to { text-shadow: 0 0 16px rgba(239, 68, 68, 0.7); }
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-xs) var(--space-sm);
    font-size: 0.625rem;
    font-weight: 700;
    border-radius: var(--radius-sm);
    text-transform: uppercase;
}

.badge-primary {
    background-color: var(--color-accent-primary);
    color: white;
}

.badge-success {
    background-color: var(--color-accent-success);
    color: white;
}

.badge-warning {
    background-color: var(--color-accent-warning);
    color: #1a1a2e;
}

.ui-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    border-radius: 999px;
    border: 1px solid var(--color-border);
    background: color-mix(in srgb, var(--color-bg-secondary) 84%, transparent);
    color: var(--color-text-secondary);
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    text-transform: uppercase;
}

.ui-eyebrow::before {
    content: '♞';
    font-size: 0.82rem;
    line-height: 1;
    opacity: 0.72;
}

.ui-state-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.ui-state-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    min-height: 32px;
    padding: 6px 12px;
    border-radius: 999px;
    border: 1px solid var(--color-border);
    background: var(--color-bg-secondary);
    color: var(--color-text-secondary);
    font-size: 0.76rem;
    font-weight: 600;
}

.ui-state-badge strong {
    color: var(--color-text-primary);
}

.ui-state-badge--success {
    border-color: color-mix(in srgb, var(--color-accent-success) 40%, var(--color-border));
    background: color-mix(in srgb, var(--color-accent-success) 10%, var(--color-bg-card));
}

.ui-state-badge--pending {
    border-color: color-mix(in srgb, var(--color-accent-secondary) 45%, var(--color-border));
    background: color-mix(in srgb, var(--color-accent-secondary) 10%, var(--color-bg-card));
}

.ui-state-badge--warning {
    border-color: color-mix(in srgb, var(--color-accent-warning) 45%, var(--color-border));
    background: color-mix(in srgb, var(--color-accent-warning) 12%, var(--color-bg-card));
}

/* Avatar */
.avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--color-bg-tertiary);
    border: 2px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}

.avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.avatar-sm {
    width: 32px;
    height: 32px;
}

.avatar-lg {
    width: 64px;
    height: 64px;
}

.avatar-placeholder {
    display: block;
    width: 100%;
    height: 100%;
    background: url("/static/images/icons/default-avatar.4cc3c134c816.svg") center/70% no-repeat;
    color: transparent;
    text-indent: -9999px;
}

.tier-badge {
    position: absolute;
    right: -6px;
    bottom: -6px;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.65rem;
    line-height: 1;
}

/* Online Status */
.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: var(--color-text-muted);
}

.status-dot.online {
    background-color: var(--color-accent-success);
    box-shadow: 0 0 6px var(--color-accent-success);
}

/* ========================================
   Utilities
   ======================================== */

.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--color-text-muted); }
.text-accent { color: var(--color-accent-primary); }
.text-success { color: var(--color-accent-success); }
.text-error { color: var(--color-accent-error); }

.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }

.d-flex { display: flex; }
.align-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }

.hidden { display: none !important; }

/* Empty State */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-xl) var(--space-md);
    text-align: center;
    color: var(--color-text-muted);
}

.empty-state-icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-md);
    opacity: 0.5;
}

.empty-state-text {
    font-size: 0.875rem;
}

.empty-state-hint {
    font-size: 0.75rem;
    margin-top: var(--space-xs);
    opacity: 0.7;
}

/* Loading Spinner */
.loading-spinner {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-lg);
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.loading-spinner::before {
    content: '';
    width: 18px;
    height: 18px;
    border: 2px solid var(--color-border);
    border-top-color: var(--color-accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Skeleton Loading */
.skeleton {
    background: linear-gradient(90deg, var(--color-bg-secondary) 25%, var(--color-bg-tertiary) 50%, var(--color-bg-secondary) 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
    border-radius: var(--radius-sm);
}

.skeleton-text {
    height: 1em;
    margin-bottom: 0.5em;
}

.skeleton-text:last-child {
    width: 60%;
}

.skeleton-avatar {
    width: 64px;
    height: 64px;
    border-radius: 50%;
}

.skeleton-stat {
    height: 2em;
    width: 60px;
}

.skeleton-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.skeleton-row {
    height: 42px;
    border-radius: var(--radius-md);
}

/* Skeleton utility sizes (inline style replacement) */
.sk-w-10 { width: 10px; }
.sk-w-18 { width: 18px; }
.sk-w-20 { width: 20px; }
.sk-w-32 { width: 32px; }
.sk-w-38 { width: 38px; }
.sk-w-40 { width: 40px; }
.sk-w-44 { width: 44px; }
.sk-w-50 { width: 50px; }
.sk-w-54 { width: 54px; }
.sk-w-56 { width: 56px; }
.sk-w-60 { width: 60px; }
.sk-w-62 { width: 62px; }
.sk-w-66 { width: 66px; }
.sk-w-70 { width: 70px; }
.sk-w-72 { width: 72px; }
.sk-w-80 { width: 80px; }
.sk-w-84 { width: 84px; }
.sk-w-85 { width: 85px; }
.sk-w-88 { width: 88px; }
.sk-w-90 { width: 90px; }
.sk-w-96 { width: 96px; }
.sk-w-100 { width: 100px; }
.sk-w-110 { width: 110px; }
.sk-w-118 { width: 118px; }
.sk-w-120 { width: 120px; }
.sk-w-130 { width: 130px; }
.sk-w-140 { width: 140px; }
.sk-w-168 { width: 168px; }
.sk-w-170 { width: 170px; }
.sk-w-180 { width: 180px; }
.sk-w-190 { width: 190px; }
.sk-w-200 { width: 200px; }
.sk-w-210 { width: 210px; }
.sk-w-230 { width: 230px; }

.sk-h-10 { height: 10px; }
.sk-h-11 { height: 11px; }
.sk-h-12 { height: 12px; }
.sk-h-14 { height: 14px; }
.sk-h-26 { height: 26px; }
.sk-h-28 { height: 28px; }
.sk-h-32 { height: 32px; }
.sk-h-40 { height: 40px; }
.sk-h-1r { height: 1rem; }
.sk-h-12r { height: 1.2rem; }

.sk-round-8 { border-radius: 8px; }
.sk-round-999 { border-radius: 999px; }
.sk-round-full { border-radius: 50%; }
.sk-mb-8 { margin-bottom: 8px; }

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* Offline Banner */
.offline-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--space-sm) var(--space-md);
    background-color: var(--color-accent-warning);
    color: #000;
    text-align: center;
    font-size: 0.75rem;
    font-weight: 500;
    z-index: var(--z-toast);
    display: none;
}

.offline-banner.show {
    display: block;
}

/* Shared social pages layout */
.main-content .social-page {
    max-width: min(1120px, 100%);
    margin-left: auto !important;
    margin-right: auto !important;
    width: 100%;
}

/* Global notice modal */
.notice-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(6, 10, 23, 0.65);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2200;
}

.notice-modal {
    width: min(520px, 92vw);
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    text-align: center;
    box-shadow: var(--shadow-lg);
}

.notice-modal-title {
    font-family: var(--font-display);
    font-size: 1rem;
    margin-bottom: var(--space-sm);
}

.notice-modal-message {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-md);
    word-break: keep-all;
}

/* Game Invite Modal */
.invite-modal {
    width: min(380px, 92vw);
    text-align: center;
}

.invite-user-info {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
    padding: var(--space-md);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
}

.invite-avatar {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    overflow: hidden;
    background: var(--color-bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    border: 2px solid var(--color-accent-primary);
}

.invite-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.invite-details {
    text-align: left;
}

.invite-nickname {
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: var(--space-xs);
}

.invite-rating {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.invite-message {
    font-size: 0.9rem;
    margin-bottom: var(--space-sm);
}

.invite-time {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
}

/* Shared modal */
.modal-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
}

.modal-overlay.hidden {
    display: none;
}

.modal {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    letter-spacing: 0;
    word-spacing: 0;
    width: min(520px, 92vw);
    max-height: 85vh;
    overflow-y: auto;
}

.modal-header,
.modal-body,
.modal-actions,
.modal-footer {
    letter-spacing: 0;
    word-spacing: 0;
}

/* Global status badge (saving/success/error/waiting) */
.global-status-badge {
    position: fixed;
    top: calc(var(--navbar-height) + var(--space-sm));
    left: 50%;
    transform: translateX(-50%);
    z-index: var(--z-status-badge);
    padding: var(--space-xs) var(--space-md);
    border-radius: 999px;
    border: 1px solid var(--color-border);
    background: var(--color-bg-card);
    color: var(--color-text-primary);
    box-shadow: var(--shadow-sm);
    font-size: 0.75rem;
    font-weight: 600;
}

.global-status-badge.hidden {
    display: none;
}

.global-status-badge--success { border-color: var(--color-accent-success); color: var(--color-accent-success); }
.global-status-badge--error { border-color: var(--color-accent-error); color: var(--color-accent-error); }
.global-status-badge--waiting { border-color: var(--color-accent-warning); color: var(--color-accent-warning); }

.modal-header {
    padding: var(--space-lg);
    border-bottom: 1px solid var(--color-border);
}

.modal-title {
    font-family: var(--font-display);
    font-size: 0.75rem;
    margin: 0;
    letter-spacing: 0;
    word-spacing: 0;
}

.modal-body {
    padding: var(--space-lg);
    font-family: var(--font-body);
}

.modal-actions,
.modal-footer {
    padding: 0 var(--space-lg) var(--space-lg);
    display: flex;
    gap: var(--space-sm);
    justify-content: flex-end;
}
.modal-actions.is-centered,
.modal-footer.is-centered {
    justify-content: center;
}

.section-title-wrap {
    display: grid;
    gap: 4px;
}

.section-copy {
    margin: 0;
    color: var(--color-text-muted);
    font-size: 0.7rem;
    line-height: 1.35;
}

.report-modal {
    max-width: 420px;
    width: min(90vw, 420px);
}

.report-modal .modal-body {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.report-modal .form-input {
    font-family: var(--font-body);
    font-size: 0.85rem;
}

/* Context Menu */
.context-menu {
    position: fixed;
    z-index: calc(var(--z-modal) - 10);
    min-width: 160px;
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: var(--space-xs);
    font-family: var(--font-body);
    font-size: 0.75rem;
    color: var(--color-text-primary);
}

.context-menu-item {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background-color var(--transition-fast);
    white-space: nowrap;
}

.context-menu-item:hover {
    background-color: var(--color-bg-tertiary);
}

/* ========================================
   Responsive
   ======================================== */

@media (max-width: 768px) {
    :root {
        --navbar-height: 56px;
    }

    .main-content {
        padding: var(--space-md);
        padding-top: calc(var(--navbar-height) + var(--space-md));
    }

    h1 { font-size: 1.25rem; }
    h2 { font-size: 1rem; }
}

/* ========================================
   Custom Modal (Dialog Component Only)
   ======================================== */

.modal-overlay.modal-overlay--dialog {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
    padding: var(--space-md);
    animation: fadeIn 0.15s ease;
}

.modal-overlay.modal-overlay--dialog.hidden {
    display: none;
}

.modal-dialog {
    background-color: var(--color-bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 360px;
    animation: slideUp 0.2s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--color-border);
}

.modal-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin: 0;
}

.modal-body {
    padding: var(--space-lg);
}

.modal-message {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.5;
    margin: 0 0 var(--space-md);
}

.modal-input {
    width: 100%;
    margin-top: var(--space-sm);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    border-top: 1px solid var(--color-border);
}

.modal-footer .btn {
    min-width: 80px;
}

@media (max-width: 480px) {
    .modal-dialog {
        max-width: 100%;
        margin: var(--space-sm);
    }

    .modal-footer {
        flex-direction: column-reverse;
    }

    .modal-footer .btn {
        width: 100%;
    }
}

/* Session Warning */
.session-warning-dialog {
    max-width: 340px;
}

/* Global status badges */
.status-badge-container {
    position: fixed;
    top: calc(var(--navbar-height) + 10px);
    right: 14px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    z-index: var(--z-status-badge);
    pointer-events: none;
}

.status-badge {
    pointer-events: auto;
    padding: 8px 12px;
    border-radius: 10px;
    border: 1px solid var(--color-border);
    background: var(--color-bg-card);
    color: var(--color-text-primary);
    box-shadow: var(--shadow-md);
    font-size: 0.75rem;
    animation: badge-in 0.16s ease;
}

.status-badge.is-leaving {
    animation: badge-out 0.16s ease forwards;
}

.status-badge-success {
    border-color: color-mix(in srgb, var(--color-accent-success) 55%, var(--color-border));
    background: color-mix(in srgb, var(--color-accent-success) 12%, var(--color-bg-card));
}

.status-badge-pending {
    border-color: color-mix(in srgb, var(--color-accent-secondary) 55%, var(--color-border));
    background: color-mix(in srgb, var(--color-accent-secondary) 12%, var(--color-bg-card));
}

.status-badge-error {
    border-color: color-mix(in srgb, var(--color-accent-error) 60%, var(--color-border));
    background: color-mix(in srgb, var(--color-accent-error) 12%, var(--color-bg-card));
}

.status-badge-info {
    border-color: color-mix(in srgb, var(--color-accent-primary) 55%, var(--color-border));
    background: color-mix(in srgb, var(--color-accent-primary) 10%, var(--color-bg-card));
}

@keyframes badge-in {
    from { opacity: 0; transform: translateY(-6px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes badge-out {
    from { opacity: 1; transform: translateY(0); }
    to { opacity: 0; transform: translateY(-6px); }
}

/* Selection visibility */
.tab-btn.active,
.mobile-tab.active,
.hero-tier-toggle[aria-expanded="true"] {
    font-weight: 700;
    text-decoration: none;
    box-shadow: inset 0 -3px 0 var(--color-accent-secondary);
    border-color: var(--color-accent-secondary);
}

.tab-btn {
    position: relative;
    transition:
        background-color var(--transition-fast),
        border-color var(--transition-fast),
        color var(--transition-fast),
        transform var(--transition-fast),
        box-shadow var(--transition-fast);
}

.tab-btn::after {
    content: '';
    position: absolute;
    left: 12px;
    right: 12px;
    bottom: 6px;
    height: 2px;
    border-radius: 999px;
    background: transparent;
    transition: background-color var(--transition-fast);
}

.tab-btn.active,
.tab-btn[aria-selected="true"] {
    color: var(--color-text-primary);
    background: color-mix(in srgb, var(--color-accent-secondary) 10%, var(--color-bg-card));
    transform: translateY(-1px);
}

.tab-btn.active::after,
.tab-btn[aria-selected="true"]::after {
    background: var(--color-accent-secondary);
}

.session-warning-dialog .modal-message strong {
    color: var(--color-accent-error);
}

.session-warning-hint {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-top: var(--space-sm);
}

/* ========================================
   Touch Feedback (Mobile)
   ======================================== */

@media (hover: none) and (pointer: coarse) {
    .btn:active,
    .nav-link:active,
    .card:active,
    .room-item:active,
    .user-item:active {
        transform: scale(0.97);
        opacity: 0.85;
        transition: transform 0.1s ease, opacity 0.1s ease;
    }

    /* 전역 탭 하이라이트 제거 */
    a, button, input, select, textarea, .card, .square {
        -webkit-tap-highlight-color: transparent;
    }
}

/* Focus visible for keyboard navigation */
.btn:focus-visible,
.square:focus-visible,
.nav-link:focus-visible,
.chat-input:focus-visible,
.form-input:focus-visible,
select:focus-visible,
textarea:focus-visible,
.tab-btn:focus-visible {
    outline: 2px solid var(--color-accent-primary);
    outline-offset: 2px;
}

/* ========================================
   Loading Skeleton
   ======================================== */

.skeleton {
    background: linear-gradient(
        90deg,
        var(--color-bg-tertiary) 25%,
        var(--color-bg-secondary) 50%,
        var(--color-bg-tertiary) 75%
    );
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
    border-radius: var(--radius-sm);
}

.skeleton-text {
    height: 1em;
    margin-bottom: var(--space-xs);
}

.skeleton-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
}

.skeleton-card {
    height: 60px;
    margin-bottom: var(--space-sm);
}

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.loading-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg);
    color: var(--color-text-muted);
}

.loading-placeholder .spinner {
    margin-bottom: var(--space-sm);
}

/* ========================================
   Guest Status Bar (Global)
   ======================================== */

.guest-status-bar-global {
    position: fixed;
    bottom: 16px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-sm) var(--space-md);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

.guest-status-bar-global .guest-status-info {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.85rem;
}

.guest-status-bar-global .guest-status-icon {
    font-size: 1rem;
}

.guest-status-bar-global .guest-status-name {
    font-weight: 500;
    color: var(--color-text-primary);
}

.guest-status-bar-global .guest-status-timer {
    color: var(--color-accent-primary);
    font-size: 0.75rem;
}

@media (max-width: 768px) {
    .guest-status-bar-global {
        bottom: 80px;
        left: 16px;
        right: 16px;
        transform: none;
    }
}

/* ========================================
   Reduced Motion Support
   ======================================== */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    .spinner,
    .loading-spinner::before {
        animation: none;
    }

    .skeleton {
        animation: none;
        background: var(--color-bg-tertiary);
    }
}

/* ========================================
   Floating Chat Button (FAB)
   ======================================== */

.chat-fab {
    position: fixed;
    right: 24px;
    bottom: calc(20px + var(--safe-bottom));
    width: 52px;
    height: 52px;
    border-radius: 50%;
    border: 1px solid var(--color-border);
    background: var(--color-bg-card);
    box-shadow: var(--shadow-md);
    font-size: 1.1rem;
    display: none; /* 기본적으로 숨김 (필요한 페이지에서 표시하거나 JS로 제어) */
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: var(--z-floating);
}

/* 로비나 게임 페이지에서 표시 */
body.has-chat-fab .chat-fab {
    display: flex;
}

.chat-fab.is-active {
    background: var(--color-accent-primary);
    color: #fff;
    border-color: var(--color-accent-primary);
}

.chat-fab-badge {
    position: absolute;
    top: -4px;
    right: -4px;
    min-width: 18px;
    height: 18px;
    padding: 0 5px;
    border-radius: 999px;
    background-color: var(--color-accent-error);
    color: #fff;
    font-size: 0.65rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.chat-fab-badge.hidden {
    display: none;
}

.chat-emoji-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 8px;
    align-items: center;
    border-top: 1px solid color-mix(in srgb, var(--color-border) 82%, transparent);
    padding-top: 10px;
}

.chat-emoji-bar + .chat-form {
    margin-top: 4px;
}

.chat-form {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    width: 100%;
}

.chat-form .chat-input {
    flex: 1;
    min-width: 0;
    min-height: 42px;
}

.chat-form .btn {
    flex: 0 0 auto;
    min-height: 42px;
    min-width: 68px;
}

.chat-form,
.dm-form,
.global-dm-form {
    padding-bottom: max(0px, env(safe-area-inset-bottom, 0px));
}

.chat-shell-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.chat-shell-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-sm);
    padding: var(--space-md);
    border-bottom: 1px solid var(--color-border);
    background: linear-gradient(180deg, color-mix(in srgb, var(--color-bg-secondary) 88%, transparent) 0%, transparent 100%);
}

.chat-shell-head .section-title,
.chat-shell-head .panel-title,
.chat-shell-head .dm-title {
    margin-bottom: 0;
}

.chat-shell-body {
    display: flex;
    flex-direction: column;
    min-height: 0;
}

.chat-shell-card .chat-messages,
.chat-shell-card .dm-messages,
.chat-shell-card .global-dm-messages {
    scrollbar-gutter: stable;
}

.chat-shell-card .chat-form,
.chat-shell-card .dm-form,
.chat-shell-card .global-dm-form {
    align-items: flex-end;
    background: var(--color-bg-card);
}

.chat-shell-card .chat-input,
.chat-shell-card .dm-input,
.chat-shell-card .global-dm-input {
    min-height: 44px;
}

.chat-shell-card .btn-sm {
    min-height: 44px;
}

.chat-emoji-bar .emoji-btn {
    border: 1px solid var(--color-border-light);
    background: color-mix(in srgb, var(--color-bg-secondary) 90%, white);
    border-radius: 12px;
    min-width: 38px;
    height: 34px;
    cursor: pointer;
    transition: transform var(--transition-fast), background-color var(--transition-fast), box-shadow var(--transition-fast);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.7);
}

.chat-emoji-bar .emoji-btn:hover {
    background: var(--color-bg-tertiary);
    transform: translateY(-1px);
}

.chat-emoji-bar,
.global-dm-emojis {
    scrollbar-width: thin;
}

.chat-reactions {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 8px;
    align-items: center;
}

.reaction-btn {
    border: 1px solid color-mix(in srgb, var(--color-border) 85%, white);
    border-radius: 999px;
    background: linear-gradient(180deg, color-mix(in srgb, var(--color-bg-secondary) 94%, white), color-mix(in srgb, var(--color-bg-card) 94%, transparent));
    color: var(--color-text-secondary);
    font-size: 0.72rem;
    line-height: 1;
    min-height: 28px;
    padding: 4px 10px;
    cursor: pointer;
    transition: transform var(--transition-fast), background-color var(--transition-fast), box-shadow var(--transition-fast);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.05);
}

.reaction-btn:hover {
    background: var(--color-bg-tertiary);
    transform: scale(1.04);
}

.reaction-btn.active,
.reaction-btn.is-reacted {
    border-color: var(--color-accent-secondary);
    background: color-mix(in srgb, var(--color-accent-secondary) 15%, var(--color-bg-secondary));
    color: var(--color-text-primary);
    font-weight: 700;
}

@media (max-width: 768px) {
    .chat-fab {
        bottom: calc(92px + var(--safe-bottom));
        right: max(16px, var(--safe-right));
    }

    #toast-container {
        top: auto;
        bottom: calc(74px + var(--safe-bottom));
        right: var(--space-sm);
        left: var(--space-sm);
        align-items: stretch;
    }

    .toast {
        max-width: 100%;
    }

    .modal-overlay {
        padding-bottom: var(--safe-bottom);
    }

    .modal-overlay:not(.modal-overlay--dialog) {
        align-items: flex-end;
        padding: 0;
        background: rgba(0, 0, 0, 0.56);
    }

    .modal-overlay:not(.modal-overlay--dialog) .modal {
        width: 100%;
        max-width: none;
        max-height: min(82vh, 760px);
        border-bottom-left-radius: 0;
        border-bottom-right-radius: 0;
        border-left: none;
        border-right: none;
        border-bottom: none;
        padding-bottom: max(var(--space-sm), var(--safe-bottom));
        animation: slideUp 0.2s ease;
    }

    .chat-form,
    .dm-form,
    .global-dm-form {
        padding-bottom: max(var(--space-sm), var(--safe-bottom));
    }

    .chat-shell-card .chat-input,
    .chat-shell-card .dm-input,
    .chat-shell-card .global-dm-input {
        min-height: 46px;
    }
}

.skeleton-row td {
    padding-top: 10px;
    padding-bottom: 10px;
}

.skeleton-pill {
    display: inline-block;
    width: 86px;
    height: 28px;
    border-radius: 999px;
}

/* ========================================
   Mobile Modal (Bottom Sheet) & Performance
   ======================================== */

.modal, .modal-dialog, .toast, .spinner {
    will-change: transform, opacity;
}

@media (max-width: 480px) {
    .modal-overlay.modal-overlay--dialog {
        align-items: flex-end;
        padding: 0;
    }

    .modal, 
    .modal-dialog, 
    .report-modal, 
    .invite-modal, 
    .notice-modal,
    .game-end-modal {
        width: 100%;
        max-width: 100%;
        border-radius: 16px 16px 0 0;
        margin: 0;
        max-height: 85vh;
        animation: slideUpBottom 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    
    .game-end-modal {
        /* 게임 종료 모달은 중앙 정렬 유지하고 싶을 수 있으나 일관성을 위해 바텀시트 적용 */
        /* 만약 중앙 정렬을 유지하려면 이 블록에서 제외 */
    }
}

@keyframes slideUpBottom {
    from { transform: translateY(100%); }
    to { transform: translateY(0); }
}