/**
 * style.css - OTT Network Styles
 * Day 28: 완성된 UI 스타일
 */

/* =================================
   CSS Variables (Design Tokens)
   ================================= */
:root {
    --color-bg-primary: #111214;
    --color-bg-secondary: #1c2026;
    --color-bg-tertiary: #26313d;
    --color-accent: #e94560;
    --color-accent-hover: #ff6b6b;
    --color-text-primary: #eaeaea;
    --color-text-secondary: #a3a8b0;
    --color-text-muted: #737983;
    --color-border: #343a42;
    --color-error: #ff4757;
    --color-success: #2ed573;

    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 40px;

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    --transition-fast: 0.15s ease;
    --transition-normal: 0.2s ease;
    --transition-slow: 0.3s ease;

    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.15);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.2);
}

/* =================================
   Reset & Base
   ================================= */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
}

body {
    font-family: 'Trebuchet MS', 'Segoe UI', sans-serif;
    background:
        linear-gradient(135deg, rgba(233, 69, 96, 0.14), transparent 34%),
        linear-gradient(315deg, rgba(46, 213, 115, 0.10), transparent 28%),
        var(--color-bg-primary);
    color: var(--color-text-primary);
    min-height: 100vh;
    line-height: 1.5;
}

/* =================================
   Layout
   ================================= */
#app {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
    padding: var(--spacing-xl) 0;
}

/* =================================
   Header
   ================================= */
header {
    padding: var(--spacing-lg) 0;
    border-bottom: 1px solid var(--color-border);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    color: var(--color-accent);
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: 0;
}

.user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

#user-welcome {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

/* =================================
   Buttons
   ================================= */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--color-accent-hover);
}

.btn-secondary {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--color-bg-secondary);
    border-color: var(--color-text-secondary);
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.875rem;
}

.btn-block {
    width: 100%;
}

.btn-loading {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
}

/* =================================
   Login Section
   ================================= */
.login-section {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 60vh;
}

.login-card {
    width: 100%;
    max-width: 400px;
    padding: var(--spacing-xl);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.login-card h2 {
    text-align: center;
    margin-bottom: var(--spacing-xs);
    font-size: 1.5rem;
}

.login-subtitle {
    text-align: center;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    font-size: 0.875rem;
}

.login-hint {
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.75rem;
    margin-top: var(--spacing-md);
}

/* =================================
   Forms
   ================================= */
.form-group {
    margin-bottom: var(--spacing-md);
}

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

.form-group input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
    font-size: 1rem;
    transition: border-color var(--transition-fast);
}

.form-group input:focus {
    outline: none;
    border-color: var(--color-accent);
}

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

.error-message {
    padding: var(--spacing-sm) var(--spacing-md);
    margin-bottom: var(--spacing-md);
    background: rgba(255, 71, 87, 0.1);
    border: 1px solid var(--color-error);
    border-radius: var(--radius-sm);
    color: var(--color-error);
    font-size: 0.875rem;
}

/* =================================
   Video Section
   ================================= */
.video-section {
    animation: fadeIn var(--transition-slow);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.section-header h2 {
    font-size: 1.8rem;
    line-height: 1.1;
}

.section-kicker {
    color: var(--color-success);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
}

.refresh-icon {
    display: inline-block;
    transition: transform var(--transition-normal);
}

.btn:hover .refresh-icon {
    transform: rotate(180deg);
}

/* Loading State */
.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl) 0;
    color: var(--color-text-secondary);
}

.loading-state p {
    margin-top: var(--spacing-md);
}

/* Empty State */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl) 0;
    color: var(--color-text-secondary);
    text-align: center;
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.empty-state h3 {
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-primary);
}

/* Video Grid */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

/* Video Card */
.video-card {
    background: var(--color-bg-secondary);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: var(--radius-md);
    overflow: hidden;
    cursor: pointer;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.video-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.video-card-thumb {
    position: relative;
    width: 100%;
    height: 160px;
    background:
        linear-gradient(135deg, color-mix(in srgb, var(--card-accent, var(--color-accent)) 55%, transparent), transparent),
        repeating-linear-gradient(90deg, rgba(255,255,255,0.10) 0 1px, transparent 1px 18px),
        var(--color-bg-tertiary);
    overflow: hidden;
}

.video-card-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.video-card:hover .video-card-thumb img {
    transform: scale(1.05);
}

.video-card-info {
    padding: var(--spacing-md);
}

.demo-thumb-label {
    position: absolute;
    left: var(--spacing-md);
    bottom: var(--spacing-md);
    display: inline-flex;
    max-width: calc(100% - 32px);
    padding: 6px 10px;
    border: 1px solid rgba(255,255,255,0.28);
    border-radius: var(--radius-sm);
    background: rgba(17, 18, 20, 0.62);
    color: #fff;
    font-size: 0.78rem;
    font-weight: 700;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.video-card-title {
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.video-card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

.resume-badge {
    display: inline-block;
    padding: 2px var(--spacing-sm);
    background: var(--color-accent);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
    color: white;
}

/* =================================
   Player Section
   ================================= */
.player-section {
    animation: fadeIn var(--transition-slow);
}

.player-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.back-icon {
    font-size: 1.25rem;
}

.player-title {
    font-size: 1.25rem;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.player-container {
    position: relative;
    width: 100%;
    max-width: 960px;
    margin: 0 auto;
    background:
        linear-gradient(135deg, rgba(233,69,96,0.22), rgba(46,213,115,0.08)),
        #050506;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

#video-player {
    width: 100%;
    min-height: 280px;
    display: block;
}

.player-info {
    max-width: 960px;
    margin: var(--spacing-md) auto 0;
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

/* =================================
   Footer
   ================================= */
footer {
    padding: var(--spacing-lg) 0;
    border-top: 1px solid var(--color-border);
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

/* =================================
   Modal
   ================================= */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    width: 90%;
    max-width: 400px;
    padding: var(--spacing-lg);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    text-align: center;
    animation: modalIn var(--transition-normal);
}

.modal-content h3 {
    margin-bottom: var(--spacing-sm);
    font-size: 1.25rem;
}

.modal-content p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
}

.modal-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
}

.modal-actions .btn {
    min-width: 120px;
}

/* =================================
   Loading Overlay
   ================================= */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(26, 26, 46, 0.9);
}

/* =================================
   Spinners
   ================================= */
.spinner,
.spinner-sm,
.spinner-large {
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-accent);
}

.spinner-sm {
    width: 16px;
    height: 16px;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-right-color: currentColor;
}

.spinner-large {
    width: 60px;
    height: 60px;
    border: 4px solid var(--color-border);
    border-top-color: var(--color-accent);
}

/* =================================
   Animations
   ================================= */
@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* =================================
   Responsive Design
   ================================= */
@media (max-width: 768px) {
    html {
        font-size: 14px;
    }

    #app {
        padding: var(--spacing-sm);
    }

    .header-content {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .logo {
        font-size: 1.5rem;
    }

    .login-card {
        padding: var(--spacing-lg);
    }

    .video-grid {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
        gap: var(--spacing-md);
    }

    .player-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .modal-actions {
        flex-direction: column;
    }

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

@media (max-width: 480px) {
    .video-grid {
        grid-template-columns: 1fr;
    }

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

    .section-header .btn {
        width: 100%;
    }
}

/* =================================
   Utilities
   ================================= */
.hidden {
    display: none !important;
}

.text-center {
    text-align: center;
}

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