/* Modern Layout System v2.0 */
/* 응시자/감독관 룸 페이지 레이아웃 */

/* ========================================
   Base Reset & Containers
   ======================================== */
*, *::before, *::after {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: var(--line-height-normal);
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.container-fluid {
    width: 100%;
    padding: 0 var(--spacing-lg);
}

.container-sm { max-width: 640px; }
.container-md { max-width: 768px; }
.container-lg { max-width: 1024px; }
.container-xl { max-width: 1280px; }

/* ========================================
   Room Page Layout (Core Structure)
   ======================================== */
.room-layout {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-height: 100vh;
    overflow: hidden;
}

.room-header {
    flex-shrink: 0;
    height: var(--header-height);
    background: var(--header-bg);
    border-bottom: 1px solid var(--header-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-lg);
    z-index: var(--z-sticky);
}

.room-main {
    flex: 1;
    display: flex;
    overflow: hidden;
    min-height: 0;
}

.room-footer {
    flex-shrink: 0;
    height: var(--footer-height);
    background: var(--footer-bg);
    border-top: 1px solid var(--footer-border);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 var(--spacing-lg);
    z-index: var(--z-sticky);
}

/* ========================================
   Video Section (Main Content Area)
   ======================================== */
.video-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: var(--spacing-lg);
    gap: var(--spacing-lg);
    overflow: hidden;
    min-width: 0;
}

.video-grid {
    flex: 1;
    display: grid;
    gap: var(--spacing-md);
    min-height: 0;
    align-content: start;
}

/* Single Video Layout */
.video-grid--single {
    grid-template-columns: 1fr;
}

/* Dual Video Layout (Tester) */
.video-grid--dual {
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: 1fr;
}

/* Manager Grid Layout */
.video-grid--manager {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    grid-auto-rows: minmax(200px, auto);
}

/* Video Card Base */
.video-card {
    position: relative;
    background: var(--video-card-bg);
    border: 1px solid var(--video-card-border);
    border-radius: var(--video-card-radius);
    overflow: hidden;
    aspect-ratio: var(--video-card-aspect-ratio);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.video-card:hover {
    box-shadow: var(--video-card-shadow);
}

.video-card--main {
    grid-column: 1 / -1;
    max-height: 60vh;
}

.video-card--mini {
    aspect-ratio: 4 / 3;
}

.video-card video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    background: #000;
}

/* Video Overlay Elements */
.video-overlay {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 5;
}

.video-label {
    position: absolute;
    top: var(--spacing-sm);
    left: var(--spacing-sm);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-1);
    padding: var(--spacing-1) var(--spacing-2);
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(4px);
    border-radius: var(--radius-sm);
    font-size: var(--text-xs);
    font-weight: var(--font-weight-medium);
    color: white;
    pointer-events: auto;
}

.video-status {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    display: flex;
    gap: var(--spacing-1);
    pointer-events: auto;
}

.video-controls-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--spacing-sm);
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.7));
    display: flex;
    align-items: center;
    justify-content: space-between;
    opacity: 0;
    transition: opacity var(--transition-fast);
    pointer-events: auto;
}

.video-card:hover .video-controls-overlay {
    opacity: 1;
}

/* No Video Placeholder */
.video-placeholder {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    background: var(--video-card-bg);
    color: rgba(255, 255, 255, 0.5);
}

.video-placeholder-icon {
    width: 48px;
    height: 48px;
    opacity: 0.3;
}

.video-placeholder-text {
    font-size: var(--text-sm);
    opacity: 0.5;
}

/* ========================================
   Chat Section (Side Panel)
   ======================================== */
.chat-section {
    width: var(--chat-width);
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    background: var(--chat-bg);
    border-left: 1px solid var(--chat-border);
    overflow: hidden;
}

.chat-section--collapsed {
    width: 0;
    border-left: none;
}

.chat-header {
    flex-shrink: 0;
    height: 50px;
    padding: 0 var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--chat-border);
    font-weight: var(--font-weight-semibold);
}

.chat-body {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.chat-footer {
    flex-shrink: 0;
    padding: var(--spacing-md);
    border-top: 1px solid var(--chat-border);
}

/* ========================================
   Header Components
   ======================================== */
.header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    backdrop-filter: blur(8px);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.header-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    text-decoration: none;
    color: var(--color-text);
}

.header-logo svg {
    width: 32px;
    height: 32px;
    color: var(--color-primary);
}

.header-title {
    font-size: var(--text-xl);
    font-weight: var(--font-weight-semibold);
    margin: 0;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* Status Bar (Room Header) */
.status-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.status-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.status-item {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    font-size: var(--text-sm);
    color: var(--color-text);
}

.status-indicator {
    width: var(--status-size);
    height: var(--status-size);
    border-radius: var(--radius-full);
    background: var(--color-text-muted);
}

.status-indicator--success {
    background: var(--color-success);
}

.status-indicator--warning {
    background: var(--color-warning);
}

.status-indicator--error {
    background: var(--color-error);
}

.status-indicator--pulse {
    animation: pulse 2s var(--ease-in-out) infinite;
}

/* ========================================
   Footer Controls
   ======================================== */
.control-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
}

.control-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 0 var(--spacing-md);
    border-right: 1px solid var(--color-border);
}

.control-group:last-child {
    border-right: none;
}

/* ========================================
   Login Page Layout
   ======================================== */
.login-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: var(--color-bg);
    padding: var(--spacing-lg);
}

.login-card {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    width: 100%;
    max-width: 420px;
    overflow: hidden;
    animation: scaleIn var(--transition-slow) var(--ease-out);
}

.login-header {
    padding: var(--spacing-2xl);
    text-align: center;
    border-bottom: 1px solid var(--color-border);
}

.login-header-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-lg);
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-header-icon svg {
    width: 32px;
    height: 32px;
}

.login-header h1 {
    font-size: var(--text-2xl);
    font-weight: var(--font-weight-semibold);
    margin: 0 0 var(--spacing-sm) 0;
}

.login-header p {
    margin: 0;
    opacity: 0.9;
    font-size: var(--text-sm);
}

.login-body {
    padding: var(--spacing-2xl);
}

.login-footer {
    padding: var(--spacing-lg) var(--spacing-2xl);
    background: var(--color-muted);
    border-top: 1px solid var(--color-border);
    text-align: center;
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
}

/* ========================================
   Grid System (Legacy Support)
   ======================================== */
.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 calc(var(--spacing-sm) * -1);
}

.col {
    flex: 1;
    padding: 0 var(--spacing-sm);
}

.col-auto { flex: 0 0 auto; }
.col-1 { flex: 0 0 8.333333%; max-width: 8.333333%; }
.col-2 { flex: 0 0 16.666667%; max-width: 16.666667%; }
.col-3 { flex: 0 0 25%; max-width: 25%; }
.col-4 { flex: 0 0 33.333333%; max-width: 33.333333%; }
.col-6 { flex: 0 0 50%; max-width: 50%; }
.col-8 { flex: 0 0 66.666667%; max-width: 66.666667%; }
.col-12 { flex: 0 0 100%; max-width: 100%; }

/* ========================================
   Dashboard Layout
   ======================================== */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.stat-card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow);
    transition: all var(--transition-base);
}

.stat-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

/* ========================================
   Sidebar Layout
   ======================================== */
.sidebar-layout {
    display: flex;
    gap: var(--spacing-lg);
    min-height: calc(100vh - 80px);
}

.sidebar {
    width: 280px;
    flex-shrink: 0;
}

.sidebar-content {
    position: sticky;
    top: 80px;
}

.main-panel {
    flex: 1;
    min-width: 0;
}

/* ========================================
   Theme Toggle
   ======================================== */
.theme-toggle, .theme-toggle-btn {
    width: 40px;
    height: 40px;
    padding: 0;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-bg);
    color: var(--color-text);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.theme-toggle:hover, .theme-toggle-btn:hover {
    border-color: var(--color-text);
    background: var(--color-muted);
}

.theme-icon {
    width: 20px;
    height: 20px;
}

/* ========================================
   Utility Classes
   ======================================== */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }
.gap-1 { gap: var(--spacing-1); }
.gap-2 { gap: var(--spacing-2); }
.gap-3 { gap: var(--spacing-3); }
.gap-4 { gap: var(--spacing-4); }
.gap-6 { gap: var(--spacing-6); }

.w-full { width: 100%; }
.h-full { height: 100%; }
.min-h-screen { min-height: 100vh; }

.overflow-hidden { overflow: hidden; }
.overflow-auto { overflow: auto; }
.overflow-y-auto { overflow-y: auto; }

.relative { position: relative; }
.absolute { position: absolute; }
.fixed { position: fixed; }
.sticky { position: sticky; }

.inset-0 { inset: 0; }
.top-0 { top: 0; }
.right-0 { right: 0; }
.bottom-0 { bottom: 0; }
.left-0 { left: 0; }

.z-10 { z-index: 10; }
.z-20 { z-index: 20; }
.z-50 { z-index: 50; }

.hidden { display: none; }
.invisible { visibility: hidden; }

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 1024px) {
    .chat-section {
        position: fixed;
        right: 0;
        top: var(--header-height);
        bottom: var(--footer-height);
        z-index: var(--z-modal);
        transform: translateX(100%);
        transition: transform var(--transition-base);
    }

    .chat-section--open {
        transform: translateX(0);
    }

    .video-grid--dual {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 50px;
        --footer-height: 70px;
    }

    .room-header {
        padding: 0 var(--spacing-md);
    }

    .room-footer {
        padding: 0 var(--spacing-md);
    }

    .video-section {
        padding: var(--spacing-md);
        gap: var(--spacing-md);
    }

    .video-grid--manager {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    }

    .status-group {
        gap: var(--spacing-md);
    }

    .control-bar {
        gap: var(--spacing-sm);
    }

    .control-group {
        padding: 0 var(--spacing-sm);
    }

    .header-container {
        padding: 0 var(--spacing-md);
    }

    .sidebar-layout {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
    }

    .sidebar-content {
        position: static;
    }

    .dashboard-grid {
        grid-template-columns: 1fr;
    }

    .login-container {
        padding: var(--spacing-md);
    }

    .login-card {
        max-width: 100%;
    }

    .login-header,
    .login-body {
        padding: var(--spacing-lg);
    }
}

@media (max-width: 640px) {
    .col-1, .col-2, .col-3, .col-4, .col-6, .col-8 {
        flex: 0 0 100%;
        max-width: 100%;
    }

    .video-card--main {
        max-height: 40vh;
    }

    .status-bar {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }

    .control-group {
        border-right: none;
        border-bottom: 1px solid var(--color-border);
        padding: var(--spacing-sm) 0;
    }

    .control-group:last-child {
        border-bottom: none;
    }
}

/* ========================================
   Print Styles
   ======================================== */
@media print {
    .room-header,
    .room-footer,
    .chat-section {
        display: none;
    }

    .video-section {
        padding: 0;
    }
}