* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-primary: #0f1419;
    --bg-secondary: #16181c;
    --bg-tertiary: #1e1f22;
    --bg-hover: #2b2d31;
    --text-primary: #e7e9ea;
    --text-secondary: #b5bac1;
    --text-muted: #71767b;
    --accent-primary: #3b82f6;
    --accent-secondary: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    --border-color: #2f3336;
    --success: #23a559;
    --warning: #f0b232;
    --error: #ed4245;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 24px;
}

/* Header */
.header {
    padding: 24px 0;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 32px;
}

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

.logo-icon {
    width: 48px;
    height: 48px;
    background: var(--accent-gradient);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.logo h1 {
    font-size: 28px;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Search Section */
.search-section {
    margin-bottom: 32px;
}

.search-form {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    align-items: flex-end;
    box-shadow: var(--shadow-md);
}

.form-group {
    flex: 1;
    min-width: 200px;
}

.form-group label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
}

.form-group label i {
    color: var(--accent-primary);
}

.form-group input,
.form-group select {
    width: 100%;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-size: 15px;
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    border: none;
    padding: 12px 28px;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

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

/* Error Container */
.error-container {
    background: rgba(237, 66, 69, 0.1);
    border: 1px solid var(--error);
    border-radius: var(--radius-md);
    padding: 16px 20px;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--error);
    animation: slideIn 0.3s ease;
}

.error-container i {
    font-size: 20px;
}

/* Loading */
.loading {
    text-align: center;
    padding: 60px 20px;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--border-color);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 16px;
}

/* Schedule Container */
.schedule-container {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    animation: slideIn 0.4s ease;
}

.schedule-header {
    background: var(--accent-gradient);
    padding: 32px;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 24px;
}

.schedule-info h2 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 8px;
}

.schedule-info .dates {
    opacity: 0.9;
    font-size: 14px;
}

.schedule-meta {
    text-align: right;
}

.week-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.2);
    padding: 8px 16px;
    border-radius: var(--radius-xl);
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 8px;
    backdrop-filter: blur(10px);
}

.week-number {
    font-size: 13px;
    opacity: 0.8;
    margin-bottom: 4px;
}

.update-time {
    font-size: 12px;
    opacity: 0.7;
}

/* Tabs */
.tabs {
    display: flex;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
    overflow-x: auto;
    scrollbar-width: none;
}

.tabs::-webkit-scrollbar {
    display: none;
}

.tab {
    flex: 1;
    min-width: 60px;
    padding: 16px 20px;
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    border-bottom: 3px solid transparent;
    white-space: nowrap;
}

.tab:hover {
    color: var(--text-primary);
    background: var(--bg-hover);
}

.tab.active {
    color: var(--accent-primary);
    border-bottom-color: var(--accent-primary);
    background: var(--bg-secondary);
}

/* Schedule Content */
.schedule-content {
    padding: 24px;
    min-height: 300px;
}

.lesson-card {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
    margin-bottom: 16px;
    transition: all 0.3s ease;
    animation: slideIn 0.3s ease;
}

.lesson-card:hover {
    border-color: var(--accent-primary);
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}

.lesson-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
    flex-wrap: wrap;
    gap: 12px;
}

.lesson-time {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.lesson-time i {
    color: var(--accent-primary);
}

.lesson-subgroup {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--accent-gradient);
    color: white;
    padding: 4px 12px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 600;
}

.lesson-room {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 600;
    color: var(--success);
}

.lesson-room i {
    font-size: 12px;
}

.lesson-room a {
    color: var(--success);
    text-decoration: none;
    transition: opacity 0.2s;
}

.lesson-room a:hover {
    opacity: 0.8;
}

.lesson-subject {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.lesson-teacher {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-secondary);
}

.lesson-teacher i {
    color: var(--accent-primary);
    font-size: 12px;
}

.lesson-teacher a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: opacity 0.2s;
}

.lesson-teacher a:hover {
    opacity: 0.8;
    text-decoration: underline;
}

.lesson-comment {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
    font-size: 13px;
    color: var(--text-muted);
    font-style: italic;
}

.lesson-comment a {
    color: var(--warning);
    text-decoration: none;
}

.lesson-comment a:hover {
    text-decoration: underline;
}

.empty-state {
    text-align: center;
    padding: 80px 20px;
    color: var(--text-muted);
}

.empty-state-icon {
    font-size: 80px;
    margin-bottom: 20px;
    opacity: 0.5;
}

.empty-state-text {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.empty-state-subtext {
    font-size: 14px;
}

/* Not Found */
.not-found {
    text-align: center;
    padding: 80px 20px;
}

.not-found-icon {
    font-size: 100px;
    margin-bottom: 24px;
    opacity: 0.5;
}

.not-found-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.not-found-text {
    color: var(--text-muted);
    font-size: 15px;
}

/* Footer */
.footer {
    text-align: center;
    padding: 32px;
    color: var(--text-muted);
    font-size: 12px;
    border-top: 1px solid var(--border-color);
    margin-top: 32px;
}

/* Animations */
@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 16px;
    }

    .search-form {
        flex-direction: column;
    }

    .form-group {
        width: 100%;
    }

    .btn-primary {
        width: 100%;
        justify-content: center;
    }

    .schedule-header {
        flex-direction: column;
    }

    .schedule-meta {
        text-align: left;
    }

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

    .tabs {
        overflow-x: auto;
    }

    .tab {
        min-width: 50px;
        padding: 12px 16px;
    }
}