/* ============================================
   신한은행 Tech 필수 학습센터
   Design System & Styles (v2.3 - 모바일 강화)
   ============================================ */

/* ===== RESET & BASE ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Brand Colors */
    --primary: #0046FF;
    --primary-light: #4D7FFF;
    --primary-lighter: #99B3FF;
    --primary-dark: #0033CC;
    --primary-darker: #002299;

    /* Accent */
    --accent: #00D2FF;
    --accent-light: #66E5FF;
    --accent-dark: #00A3CC;

    /* Semantic */
    --success: #10B981;
    --warning: #F59E0B;
    --danger: #EF4444;
    --info: #3B82F6;

    /* Neutrals */
    --bg-primary: #0A0E1A;
    --bg-secondary: #111827;
    --bg-tertiary: #1F2937;
    --bg-card: rgba(17, 24, 39, 0.8);
    --bg-card-hover: rgba(31, 41, 55, 0.9);

    --text-primary: #F9FAFB;
    --text-secondary: #D1D5DB;
    --text-tertiary: #9CA3AF;
    --text-muted: #6B7280;

    --border-color: rgba(255, 255, 255, 0.08);
    --border-color-light: rgba(255, 255, 255, 0.15);

    /* Glass */
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-bg-hover: rgba(255, 255, 255, 0.08);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-blur: blur(20px);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #0046FF 0%, #00D2FF 100%);
    --gradient-card: linear-gradient(135deg, rgba(0, 70, 255, 0.1) 0%, rgba(0, 210, 255, 0.05) 100%);
    --gradient-hero: linear-gradient(135deg, #0046FF 0%, #7B2FFF 50%, #00D2FF 100%);

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(0, 70, 255, 0.15);

    /* Layout */
    --nav-height: 64px;
    --sidebar-width: 260px;

    /* Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Font */
    --font-main: 'Pretendard', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    text-decoration: none;
    color: inherit;
}

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
    color: inherit;
}

input, select {
    font-family: inherit;
    color: inherit;
}

/* ===== SCREEN MANAGEMENT ===== */
.screen {
    display: none;
}
.screen.active {
    display: block;
}

/* ===== LOGIN SCREEN ===== */
.login-bg {
    position: fixed;
    inset: 0;
    background: var(--bg-primary);
    overflow: hidden;
    z-index: 0;
}

.login-gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    animation: orbFloat 20s ease-in-out infinite;
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: var(--primary);
    top: -200px;
    right: -100px;
    animation-delay: 0s;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: var(--accent);
    bottom: -100px;
    left: -100px;
    animation-delay: -7s;
}

.orb-3 {
    width: 300px;
    height: 300px;
    background: #7B2FFF;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -14s;
}

@keyframes orbFloat {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(30px, -50px) scale(1.1); }
    50% { transform: translate(-20px, 20px) scale(0.95); }
    75% { transform: translate(50px, 30px) scale(1.05); }
}

.login-particles {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.particle {
    position: absolute;
    width: 2px;
    height: 2px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    animation: particleFloat linear infinite;
}

@keyframes particleFloat {
    0% { transform: translateY(100vh) scale(0); opacity: 0; }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% { transform: translateY(-10vh) scale(1); opacity: 0; }
}

.login-container {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.login-card {
    width: 100%;
    max-width: 420px;
    background: rgba(17, 24, 39, 0.7);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: 48px 40px;
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    animation: cardAppear 0.8s ease-out;
}

@keyframes cardAppear {
    from { opacity: 0; transform: translateY(30px) scale(0.95); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.login-logo {
    text-align: center;
    margin-bottom: 24px;
}

.logo-img {
    height: 48px;
    width: auto;
    filter: brightness(1.1);
}

.login-title {
    text-align: center;
    font-size: 1.75rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.login-subtitle {
    text-align: center;
    color: var(--text-tertiary);
    font-size: 0.9rem;
    margin-bottom: 36px;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.input-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-icon {
    position: absolute;
    left: 14px;
    width: 18px;
    height: 18px;
    color: var(--text-muted);
    pointer-events: none;
    transition: color var(--transition-fast);
}

.input-wrapper input {
    width: 100%;
    padding: 14px 14px 14px 44px;
    background: var(--glass-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    color: var(--text-primary);
    transition: all var(--transition-fast);
    outline: none;
}

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

.input-wrapper input:focus {
    border-color: var(--primary);
    background: rgba(0, 70, 255, 0.05);
    box-shadow: 0 0 0 3px rgba(0, 70, 255, 0.15);
}

.input-wrapper:focus-within .input-icon {
    color: var(--primary-light);
}

.login-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 14px;
    background: var(--gradient-primary);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 700;
    color: white;
    cursor: pointer;
    transition: all var(--transition-normal);
    margin-top: 8px;
    position: relative;
    overflow: hidden;
}

.login-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.2) 0%, transparent 50%);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.login-btn:hover::before {
    opacity: 1;
}

.login-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 70, 255, 0.4);
}

.login-btn:active {
    transform: translateY(0);
}

.login-btn svg {
    width: 18px;
    height: 18px;
    transition: transform var(--transition-fast);
}

.login-btn:hover svg {
    transform: translateX(4px);
}

.login-error {
    text-align: center;
    color: var(--danger);
    font-size: 0.85rem;
    min-height: 20px;
    margin-top: 8px;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.login-error.show {
    opacity: 1;
}

.login-footer {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.75rem;
    margin-top: 24px;
}

/* ===== TOP NAVIGATION ===== */
.top-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: rgba(10, 14, 26, 0.85);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    z-index: 100;
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.nav-menu-btn {
    display: none;
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast);
}

.nav-menu-btn:hover {
    background: var(--glass-bg-hover);
}

.nav-menu-btn svg {
    width: 22px;
    height: 22px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-logo {
    height: 32px;
    width: auto;
}

.nav-title {
    font-size: 1.1rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.nav-user {
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 700;
    color: white;
}

.nav-user-name {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.nav-logout-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    transition: all var(--transition-fast);
}

.nav-logout-btn:hover {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
}

.nav-logout-btn svg {
    width: 18px;
    height: 18px;
}

/* ===== SIDEBAR ===== */
.sidebar {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    bottom: 0;
    width: var(--sidebar-width);
    z-index: 90;
}

.sidebar-overlay {
    display: none;
}

.sidebar-content {
    height: 100%;
    background: rgba(17, 24, 39, 0.6);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 24px 16px;
    overflow-y: auto;
}

.sidebar-header {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 0 8px 24px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 16px;
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.sidebar-logo {
    height: 24px;
    width: auto;
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
    flex: 1;
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-tertiary);
    transition: all var(--transition-fast);
    position: relative;
}

.sidebar-link svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.sidebar-link:hover {
    background: var(--glass-bg-hover);
    color: var(--text-primary);
}

.sidebar-link.active {
    background: rgba(0, 70, 255, 0.12);
    color: var(--primary-light);
    font-weight: 600;
}

.sidebar-link.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 24px;
    background: var(--primary);
    border-radius: 0 4px 4px 0;
}

.sidebar-badge {
    margin-left: auto;
    padding: 2px 8px;
    background: rgba(245, 158, 11, 0.15);
    color: var(--warning);
    font-size: 0.7rem;
    font-weight: 600;
    border-radius: 20px;
}

.sidebar-footer {
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.sidebar-footer p {
    font-size: 0.7rem;
    color: var(--text-muted);
    line-height: 1.8;
}

/* ===== MAIN CONTENT ===== */
.main-content {
    margin-left: var(--sidebar-width);
    margin-top: var(--nav-height);
    padding: 32px;
    min-height: calc(100vh - var(--nav-height));
}

.page {
    display: none;
    animation: pageIn 0.4s ease-out;
}

.page.active {
    display: block;
}

@keyframes pageIn {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ===== PAGE HEADER ===== */
.page-header {
    margin-bottom: 32px;
}

.page-greeting {
    font-size: 1.75rem;
    font-weight: 800;
    margin-bottom: 4px;
}

.page-desc {
    color: var(--text-tertiary);
    font-size: 0.95rem;
}

/* ===== SUMMARY CARDS ===== */
.summary-cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 40px;
}

.summary-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    display: flex;
    align-items: flex-start;
    gap: 16px;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.summary-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.card-total::before { background: var(--gradient-primary); }
.card-period::before { background: linear-gradient(90deg, var(--accent), #10B981); }
.card-recent::before { background: linear-gradient(90deg, #F59E0B, #EF4444); }
.card-unique::before { background: linear-gradient(90deg, #7B2FFF, #EC4899); }

.summary-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--border-color-light);
}

.summary-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.card-total .summary-icon { background: rgba(0, 70, 255, 0.12); color: var(--primary-light); }
.card-period .summary-icon { background: rgba(0, 210, 255, 0.12); color: var(--accent); }
.card-recent .summary-icon { background: rgba(245, 158, 11, 0.12); color: var(--warning); }
.card-unique .summary-icon { background: rgba(123, 47, 255, 0.12); color: #A78BFA; }

.summary-icon svg {
    width: 24px;
    height: 24px;
}

.summary-info {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.summary-label {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.summary-value {
    font-size: 2rem;
    font-weight: 800;
    line-height: 1.2;
    color: var(--text-primary);
    word-break: break-word;
}

.summary-value-sm {
    font-size: 0.95rem;
    font-weight: 600;
    line-height: 1.4;
}

.summary-unit {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 2px;
}

/* ===== DASHBOARD SECTIONS ===== */
.dashboard-section {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 24px;
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}

.section-header h3 {
    font-size: 1.1rem;
    font-weight: 700;
}

.section-link {
    font-size: 0.85rem;
    color: var(--primary-light);
    font-weight: 600;
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.section-link:hover {
    background: rgba(0, 70, 255, 0.1);
}

/* Recent List */
.recent-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.recent-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 14px 16px;
    background: var(--glass-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.recent-item:hover {
    background: var(--glass-bg-hover);
    border-color: var(--border-color-light);
}

.recent-item-date {
    flex-shrink: 0;
    padding: 6px 12px;
    background: rgba(0, 70, 255, 0.1);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--primary-light);
    white-space: nowrap;
}

.recent-item-info {
    flex: 1;
    min-width: 0;
}

.recent-item-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    word-break: break-word;
}

.recent-item-subtitle {
    font-size: 0.78rem;
    color: var(--text-muted);
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    margin-top: 2px;
    word-break: break-word;
}

.recent-item-link {
    flex-shrink: 0;
    padding: 6px 12px;
    background: var(--glass-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent);
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.recent-item-link:hover {
    background: rgba(0, 210, 255, 0.1);
    border-color: var(--accent);
}

/* Chart */
.chart-container {
    display: flex;
    align-items: flex-end;
    gap: 8px;
    height: 200px;
    padding: 16px 0;
}

.chart-bar-group {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    height: 100%;
    justify-content: flex-end;
}

.chart-bar {
    width: 100%;
    max-width: 48px;
    background: var(--gradient-primary);
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    min-height: 4px;
    transition: all var(--transition-normal);
    position: relative;
}

.chart-bar:hover {
    filter: brightness(1.2);
}

.chart-bar-value {
    position: absolute;
    top: -22px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--primary-light);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.chart-bar:hover .chart-bar-value {
    opacity: 1;
}

.chart-bar-label {
    font-size: 0.65rem;
    color: var(--text-muted);
    text-align: center;
    white-space: nowrap;
}

/* ===== FILTER BAR ===== */
.filter-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.filter-search {
    flex: 1;
    min-width: 200px;
    position: relative;
    display: flex;
    align-items: center;
}

.filter-search svg {
    position: absolute;
    left: 14px;
    width: 18px;
    height: 18px;
    color: var(--text-muted);
    pointer-events: none;
}

.filter-search input {
    width: 100%;
    padding: 12px 14px 12px 44px;
    background: var(--glass-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    outline: none;
    transition: all var(--transition-fast);
}

.filter-search input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 70, 255, 0.15);
}

.filter-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.filter-group select {
    padding: 12px 16px;
    background: var(--glass-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    outline: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%239CA3AF' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

.filter-group select:focus {
    border-color: var(--primary);
}

.filter-group select option {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.filter-view-btn {
    width: 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-muted);
    transition: all var(--transition-fast);
}

.filter-view-btn:hover {
    background: var(--glass-bg-hover);
    color: var(--text-primary);
}

.filter-view-btn.active {
    background: rgba(0, 70, 255, 0.12);
    border-color: var(--primary);
    color: var(--primary-light);
}

.filter-view-btn svg {
    width: 18px;
    height: 18px;
}

/* ===== HISTORY CONTENT ===== */
.history-content {
    min-height: 300px;
}

/* Timeline View */
.timeline-group {
    margin-bottom: 32px;
    animation: pageIn 0.4s ease-out;
}

.timeline-group-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

.timeline-group-badge {
    padding: 6px 16px;
    background: var(--gradient-primary);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 700;
    color: white;
    white-space: nowrap;
}

.timeline-group-count {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.timeline-items {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding-left: 20px;
    border-left: 2px solid var(--border-color);
}

.timeline-item {
    position: relative;
    padding: 16px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -27px;
    top: 22px;
    width: 12px;
    height: 12px;
    background: var(--primary);
    border: 3px solid var(--bg-primary);
    border-radius: 50%;
}

.timeline-item:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-color-light);
    transform: translateX(4px);
}

.timeline-item-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 8px;
    margin-bottom: 6px;
    flex-wrap: wrap;
}

.timeline-item-num {
    flex-shrink: 0;
    padding: 2px 10px;
    background: rgba(0, 70, 255, 0.1);
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--primary-light);
}

.timeline-item-shinhan {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.4;
    word-break: break-word;
}

.timeline-item-udemy {
    font-size: 0.8rem;
    color: var(--text-muted);
    line-height: 1.4;
    margin-bottom: 10px;
    word-break: break-word;
}

.timeline-item-footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
}

.timeline-item-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    background: rgba(0, 210, 255, 0.08);
    border: 1px solid rgba(0, 210, 255, 0.2);
    border-radius: var(--radius-sm);
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--accent);
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.timeline-item-link:hover {
    background: rgba(0, 210, 255, 0.15);
    border-color: var(--accent);
}

.timeline-item-link svg {
    width: 14px;
    height: 14px;
}

/* Card View */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 16px;
}

.course-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.course-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
}

.course-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--border-color-light);
}

.course-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
    gap: 8px;
}

.course-card-num {
    padding: 4px 12px;
    background: rgba(0, 70, 255, 0.1);
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--primary-light);
    flex-shrink: 0;
}

.course-card-date {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 500;
    flex-shrink: 0;
}

.course-card-shinhan {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.4;
    margin-bottom: 6px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    word-break: break-word;
}

.course-card-udemy {
    font-size: 0.8rem;
    color: var(--text-muted);
    line-height: 1.4;
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    word-break: break-word;
}

.course-card-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background: rgba(0, 210, 255, 0.08);
    border: 1px solid rgba(0, 210, 255, 0.2);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--accent);
    transition: all var(--transition-fast);
    width: 100%;
    justify-content: center;
    white-space: nowrap;
}

.course-card-link:hover {
    background: rgba(0, 210, 255, 0.15);
    border-color: var(--accent);
}

.course-card-link svg {
    width: 14px;
    height: 14px;
}

/* ===== COMING SOON ===== */
.coming-soon {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 80px 20px;
    text-align: center;
}

.coming-soon-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: rgba(0, 70, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    color: var(--primary-light);
}

.coming-soon-icon svg {
    width: 40px;
    height: 40px;
}

.coming-soon h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.coming-soon p {
    color: var(--text-tertiary);
    font-size: 0.9rem;
    line-height: 1.8;
}

/* ===== EMPTY STATE ===== */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    text-align: center;
    color: var(--text-muted);
}

.empty-state svg {
    width: 48px;
    height: 48px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state p {
    font-size: 0.9rem;
}

/* ===== LOADING ===== */
.loading-spinner {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 60px;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ===== DUPLICATE WARNING ===== */
.duplicate-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 8px;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--danger);
    white-space: nowrap;
}

.duplicate-badge svg {
    width: 12px;
    height: 12px;
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border-color-light);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ============================================
   RESPONSIVE - 모바일 강화
   ============================================ */

/* ===== 태블릿 (1200px 이하) ===== */
@media (max-width: 1200px) {
    .summary-cards {
        grid-template-columns: repeat(2, 1fr);
    }

    .card-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    }
}

/* ===== 모바일 (768px 이하) ===== */
@media (max-width: 768px) {
    /* 네비게이션 */
    .nav-menu-btn {
        display: flex;
    }

    .nav-title {
        display: none;
    }

    .nav-user-name {
        display: none;
    }

    .top-nav {
        padding: 0 12px;
    }

    /* 사이드바 */
    .sidebar {
        transform: translateX(-100%);
        transition: transform var(--transition-normal);
        z-index: 200;
        width: 280px;
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .sidebar.open .sidebar-overlay {
        display: block;
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: -1;
    }

    /* 메인 콘텐츠 */
    .main-content {
        margin-left: 0;
        padding: 16px 12px;
    }

    /* 페이지 헤더 */
    .page-header {
        margin-bottom: 20px;
    }

    .page-greeting {
        font-size: 1.2rem;
    }

    .page-desc {
        font-size: 0.8rem;
    }

    /* 요약 카드 */
    .summary-cards {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
        margin-bottom: 24px;
    }

    .summary-card {
        padding: 14px 12px;
        flex-direction: column;
        gap: 8px;
    }

    .summary-card:hover {
        transform: none;
    }

    .summary-icon {
        width: 40px;
        height: 40px;
    }

    .summary-icon svg {
        width: 20px;
        height: 20px;
    }

    .summary-value {
        font-size: 1.4rem;
    }

    .summary-value-sm {
        font-size: 0.8rem;
    }

    .summary-label {
        font-size: 0.7rem;
    }

    .summary-unit {
        font-size: 0.7rem;
    }

    /* 대시보드 섹션 */
    .dashboard-section {
        padding: 14px;
        margin-bottom: 16px;
    }

    .section-header {
        margin-bottom: 12px;
    }

    .section-header h3 {
        font-size: 0.95rem;
    }

    .section-link {
        font-size: 0.75rem;
        padding: 4px 8px;
    }

    /* 최근 목록 */
    .recent-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
        padding: 12px;
    }

    .recent-item-date {
        padding: 4px 10px;
        font-size: 0.7rem;
    }

    .recent-item-info {
        width: 100%;
    }

    .recent-item-title {
        font-size: 0.85rem;
        -webkit-line-clamp: 2;
    }

    .recent-item-subtitle {
        font-size: 0.72rem;
    }

    .recent-item-link {
        align-self: flex-end;
        padding: 4px 10px;
        font-size: 0.7rem;
    }

    /* 차트 */
    .chart-container {
        height: 160px;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    .chart-bar-group {
        min-width: 40px;
    }

    .chart-bar-label {
        font-size: 0.6rem;
    }

    /* 필터바 */
    .filter-bar {
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
    }

    .filter-search {
        min-width: 0;
    }

    .filter-search input {
        padding: 10px 12px 10px 40px;
        font-size: 0.85rem;
    }

    .filter-group {
        flex-wrap: wrap;
        gap: 6px;
    }

    .filter-group select {
        flex: 1;
        min-width: 100px;
        padding: 10px 32px 10px 12px;
        font-size: 0.8rem;
    }

    .filter-view-btn {
        width: 38px;
        height: 38px;
    }

    /* 타임라인 */
    .timeline-group {
        margin-bottom: 24px;
    }

    .timeline-group-header {
        gap: 8px;
        margin-bottom: 12px;
        padding-bottom: 8px;
    }

    .timeline-group-badge {
        padding: 4px 12px;
        font-size: 0.78rem;
    }

    .timeline-group-count {
        font-size: 0.72rem;
    }

    .timeline-items {
        padding-left: 14px;
        gap: 8px;
    }

    .timeline-item {
        padding: 12px 14px;
    }

    .timeline-item::before {
        left: -21px;
        top: 18px;
        width: 10px;
        height: 10px;
        border-width: 2px;
    }

    .timeline-item:hover {
        transform: none;
    }

    .timeline-item-header {
        gap: 6px;
    }

    .timeline-item-num {
        padding: 2px 8px;
        font-size: 0.65rem;
    }

    .timeline-item-shinhan {
        font-size: 0.85rem;
        line-height: 1.35;
    }

    .timeline-item-udemy {
        font-size: 0.72rem;
        line-height: 1.35;
        margin-bottom: 8px;
    }

    .timeline-item-link {
        padding: 5px 10px;
        font-size: 0.7rem;
    }

    .timeline-item-link svg {
        width: 12px;
        height: 12px;
    }

    /* 카드 그리드 */
    .card-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .course-card {
        padding: 16px 14px;
    }

    .course-card:hover {
        transform: none;
    }

    .course-card-header {
        margin-bottom: 8px;
    }

    .course-card-num {
        padding: 3px 10px;
        font-size: 0.7rem;
    }

    .course-card-date {
        font-size: 0.7rem;
    }

    .course-card-shinhan {
        font-size: 0.88rem;
        -webkit-line-clamp: 3;
        margin-bottom: 4px;
    }

    .course-card-udemy {
        font-size: 0.75rem;
        margin-bottom: 12px;
    }

    .course-card-link {
        padding: 8px 12px;
        font-size: 0.75rem;
    }

    /* 로그인 */
    .login-card {
        padding: 28px 20px;
        max-width: 100%;
        border-radius: var(--radius-lg);
    }

    .login-logo {
        margin-bottom: 16px;
    }

    .logo-img {
        height: 40px;
    }

    .login-title {
        font-size: 1.3rem;
    }

    .login-subtitle {
        font-size: 0.8rem;
        margin-bottom: 28px;
    }

    .login-form {
        gap: 16px;
    }

    .input-wrapper input {
        padding: 12px 12px 12px 40px;
        font-size: 0.9rem;
    }

    .input-icon {
        left: 12px;
        width: 16px;
        height: 16px;
    }

    .login-btn {
        padding: 12px;
        font-size: 0.9rem;
    }

    /* Coming Soon */
    .coming-soon {
        padding: 40px 16px;
    }

    .coming-soon-icon {
        width: 60px;
        height: 60px;
    }

    .coming-soon-icon svg {
        width: 30px;
        height: 30px;
    }

    .coming-soon h3 {
        font-size: 1.1rem;
    }

    .coming-soon p {
        font-size: 0.8rem;
    }

    /* 중복 뱃지 */
    .duplicate-badge {
        font-size: 0.65rem;
        padding: 2px 6px;
    }
}

/* ===== 소형 모바일 (480px 이하) ===== */
@media (max-width: 480px) {
    .main-content {
        padding: 12px 8px;
    }

    .summary-cards {
        grid-template-columns: 1fr 1fr;
        gap: 8px;
    }

    .summary-card {
        padding: 10px;
        gap: 6px;
    }

    .summary-value {
        font-size: 1.2rem;
    }

    .page-greeting {
        font-size: 1.05rem;
    }

    .page-desc {
        font-size: 0.75rem;
    }

    .dashboard-section {
        padding: 10px;
        margin-bottom: 12px;
    }

    .section-header h3 {
        font-size: 0.88rem;
    }

    .recent-item {
        padding: 10px;
    }

    .recent-item-title {
        font-size: 0.8rem;
    }

    .chart-container {
        height: 130px;
    }

    .chart-bar-group {
        min-width: 36px;
    }

    .chart-bar-label {
        font-size: 0.55rem;
    }

    .timeline-items {
        padding-left: 12px;
    }

    .timeline-item {
        padding: 10px 12px;
    }

    .timeline-item::before {
        left: -19px;
        width: 8px;
        height: 8px;
    }

    .timeline-item-shinhan {
        font-size: 0.8rem;
    }

    .timeline-item-udemy {
        font-size: 0.7rem;
    }

    .course-card {
        padding: 12px 10px;
    }

    .course-card-shinhan {
        font-size: 0.82rem;
    }

    .course-card-udemy {
        font-size: 0.7rem;
    }

    .login-card {
        padding: 24px 16px;
    }

    .login-title {
        font-size: 1.15rem;
    }

    .login-subtitle {
        font-size: 0.75rem;
        margin-bottom: 24px;
    }

    .input-wrapper input {
        padding: 10px 10px 10px 36px;
        font-size: 0.85rem;
    }

    .login-btn {
        padding: 10px;
        font-size: 0.85rem;
    }

    .nav-logo {
        height: 28px;
    }

    .nav-user-avatar {
        width: 32px;
        height: 32px;
        font-size: 0.75rem;
    }

    .nav-logout-btn {
        width: 32px;
        height: 32px;
    }

    .nav-logout-btn svg {
        width: 16px;
        height: 16px;
    }

    .filter-search input {
        padding: 8px 10px 8px 36px;
        font-size: 0.8rem;
    }

    .filter-group select {
        padding: 8px 28px 8px 10px;
        font-size: 0.78rem;
    }

    .filter-view-btn {
        width: 34px;
        height: 34px;
    }

    .filter-view-btn svg {
        width: 16px;
        height: 16px;
    }
}

/* ===== 초소형 모바일 (360px 이하) ===== */
@media (max-width: 360px) {
    .summary-cards {
        grid-template-columns: 1fr;
        gap: 6px;
    }

    .summary-card {
        flex-direction: row;
        align-items: center;
        padding: 10px;
    }

    .summary-value {
        font-size: 1.1rem;
    }

    .page-greeting {
        font-size: 0.95rem;
    }

    .login-card {
        padding: 20px 12px;
    }

    .login-title {
        font-size: 1.05rem;
    }

    .timeline-group-badge {
        padding: 3px 10px;
        font-size: 0.72rem;
    }

    .course-card-shinhan {
        font-size: 0.78rem;
    }

    .timeline-item-shinhan {
        font-size: 0.78rem;
    }
}