/* Study Schedule - AgentDefenders Inspired Design */

@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;600;700&display=swap');

/* AgentDefenders Light Mode Tokens */
:root {
    --color-bg: #F2EDE4;
    --color-surface: #FFFFFF;
    --color-text-primary: #1A1A18;
    --color-text-muted: #5F5E5A;
    --color-accent: #C0392B;
    --color-border: #E8E0D6;
    --color-code-bg: #1A1A18;
    --color-code-syntax: #4A9CE8;

    --font-display: Georgia, 'Times New Roman', serif;
    --font-ui: 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;

    --shadow-sm: 0 1px 3px rgba(26, 26, 24, 0.08);
    --shadow: 0 2px 8px rgba(26, 26, 24, 0.12);
    --shadow-lg: 0 8px 24px rgba(26, 26, 24, 0.16);
}

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

body {
    font-family: var(--font-ui);
    background: var(--color-bg);
    color: var(--color-text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Loading */
.loading {
    position: fixed;
    inset: 0;
    background: var(--color-surface);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 1;
    transition: opacity 0.3s;
}

.loading.hidden {
    opacity: 0;
    pointer-events: none;
}

.loader {
    width: 48px;
    height: 48px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Screens */
.screen {
    display: none;
    min-height: 100vh;
}

.screen.active {
    display: block;
}

/* Auth Screen */
#authScreen {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
    background: var(--color-bg);
}

.auth-container {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    padding: 48px;
    max-width: 480px;
    width: 100%;
    box-shadow: var(--shadow-lg);
}

.auth-header {
    text-align: center;
    margin-bottom: 40px;
    padding-bottom: 24px;
    border-bottom: 2px solid var(--color-border);
}

.auth-header h1 {
    font-family: var(--font-display);
    font-size: 42px;
    font-weight: 400;
    margin-bottom: 8px;
    color: var(--color-text-primary);
}

.auth-header p {
    font-family: var(--font-ui);
    color: var(--color-text-muted);
    font-size: 14px;
    letter-spacing: 0.5px;
}

.auth-form h2 {
    font-family: var(--font-display);
    font-size: 28px;
    font-weight: 400;
    margin-bottom: 32px;
    color: var(--color-text-primary);
}

/* Form Elements */
.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-family: var(--font-ui);
    font-weight: 600;
    font-size: 13px;
    color: var(--color-text-primary);
}

input, select, textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-text-primary);
    font-family: var(--font-mono);
    font-size: 14px;
    transition: all 0.2s;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(192, 57, 43, 0.1);
}

input::placeholder {
    color: var(--color-text-muted);
    opacity: 0.6;
}

/* Buttons */
.btn {
    padding: 10px 20px;
    border: 2px solid var(--color-accent);
    background: var(--color-accent);
    color: white;
    font-family: var(--font-ui);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-block;
    text-align: center;
    white-space: nowrap;
}

.btn:hover {
    background: #A02F24;
    border-color: #A02F24;
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

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

.btn-primary:hover {
    background: #A02F24;
    border-color: #A02F24;
}

.btn-secondary {
    background: transparent;
    color: var(--color-text-muted);
    border-color: var(--color-text-muted);
}

.btn-secondary:hover {
    background: var(--color-bg);
    color: var(--color-text-primary);
    border-color: var(--color-text-primary);
}

.btn-danger {
    border-color: var(--color-accent);
    background: transparent;
    color: var(--color-accent);
}

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

.btn-success {
    border-color: #27ae60;
    background: transparent;
    color: #27ae60;
}

.btn-success:hover {
    background: #27ae60;
    color: white;
}

/* Button sizing contexts */
.btn-icon {
    background: transparent;
    border: 1px solid var(--color-border);
    font-size: 16px;
    cursor: pointer;
    padding: 8px 12px;
    transition: all 0.2s;
    color: var(--color-text-muted);
}

.btn-icon:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    background: rgba(192, 57, 43, 0.05);
}

.auth-form .btn {
    width: 100%;
    padding: 14px 24px;
}

.auth-form .btn-secondary {
    margin-top: 12px;
}

.modal-footer .btn {
    flex: 1 1 0;
}

.card-actions .btn {
    padding: 6px 12px;
    font-size: 12px;
}

/* App Header */
.app-header {
    background: var(--color-surface);
    border-bottom: 2px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 24px 32px;
}

.header-content h1 {
    font-family: var(--font-display);
    font-size: 32px;
    font-weight: 400;
    color: var(--color-text-primary);
}

.header-actions {
    display: flex;
    gap: 12px;
}

/* Tabs */
.tabs {
    display: flex;
    padding: 0 32px;
    gap: 0;
    overflow-x: auto;
    background: var(--color-surface);
}

.tab {
    padding: 16px 24px;
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    font-family: var(--font-ui);
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text-muted);
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

.tab.active {
    color: var(--color-accent);
    border-bottom-color: var(--color-accent);
}

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

/* App Content */
.app-content {
    padding: 40px 32px;
    max-width: 1400px;
    margin: 0 auto;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Section Header */
.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 32px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--color-border);
    gap: 20px;
}

.section-header h2 {
    font-family: var(--font-display);
    font-size: 32px;
    font-weight: 400;
    color: var(--color-text-primary);
    flex: 1;
}

.section-header .btn {
    flex-shrink: 0;
}

/* Card List */
.card-list {
    display: grid;
    gap: 24px;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
}

.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    padding: 24px;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s;
}

.card:hover {
    box-shadow: var(--shadow);
    transform: translateY(-2px);
    border-color: var(--color-accent);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--color-border);
}

.card-title {
    font-family: var(--font-ui);
    font-size: 18px;
    font-weight: 600;
    color: var(--color-text-primary);
}

.card-actions {
    display: flex;
    gap: 8px;
}

.card-body {
    color: var(--color-text-muted);
    font-size: 14px;
    line-height: 1.6;
}

.card-footer {
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px solid var(--color-border);
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

/* Schedule View */
.schedule-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 32px;
    flex-wrap: wrap;
    gap: 20px;
}

.schedule-header .btn {
    flex-shrink: 0;
}

.date-nav {
    display: flex;
    align-items: center;
    gap: 20px;
}

.date-nav h2 {
    font-family: var(--font-ui);
    font-size: 18px;
    font-weight: 600;
    min-width: 240px;
    text-align: center;
    color: var(--color-text-primary);
}

.schedule-view {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.schedule-grid {
    display: grid;
    grid-template-columns: 80px repeat(7, 1fr);
    gap: 1px;
    background: var(--color-border);
}

.schedule-header-cell {
    background: var(--color-bg);
    padding: 16px 12px;
    text-align: center;
    font-family: var(--font-ui);
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--color-text-muted);
}

.schedule-time-cell {
    background: var(--color-surface);
    padding: 16px 12px;
    text-align: center;
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--color-text-muted);
}

.schedule-cell {
    background: var(--color-surface);
    min-height: 100px;
    padding: 12px;
    position: relative;
}

.class-block {
    background: rgba(192, 57, 43, 0.08);
    border-left: 3px solid var(--color-accent);
    color: var(--color-text-primary);
    padding: 12px;
    font-size: 13px;
    margin-bottom: 8px;
    cursor: pointer;
    transition: all 0.2s;
}

.class-block:hover {
    background: rgba(192, 57, 43, 0.15);
    transform: translateX(4px);
    box-shadow: var(--shadow-sm);
}

.class-block.skipped {
    opacity: 0.5;
    border-left-color: var(--color-text-muted);
    background: var(--color-bg);
}

.class-block.skipped .class-title {
    text-decoration: line-through;
}

.class-block.completed {
    background: rgba(39, 174, 96, 0.08);
    border-left-color: #27ae60;
}

.class-title {
    font-family: var(--font-ui);
    font-weight: 600;
    margin-bottom: 6px;
}

.class-time {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--color-text-muted);
}

.class-teacher {
    font-size: 12px;
    color: var(--color-text-muted);
    margin-top: 6px;
}

/* Badge */
.badge {
    display: inline-block;
    padding: 4px 12px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border: 1px solid;
    background: var(--color-surface);
}

.badge-primary {
    border-color: var(--color-code-syntax);
    color: var(--color-code-syntax);
}

.badge-success {
    border-color: #27ae60;
    color: #27ae60;
}

.badge-warning {
    border-color: #f39c12;
    color: #f39c12;
}

.badge-danger {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(26, 26, 24, 0.75);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: 20px;
    backdrop-filter: blur(4px);
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    max-width: 560px;
    width: 100%;
    max-height: 90vh;
    overflow: auto;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 24px;
    border-bottom: 2px solid var(--color-border);
    background: var(--color-bg);
}

.modal-header h2 {
    font-family: var(--font-display);
    font-size: 24px;
    font-weight: 400;
    color: var(--color-text-primary);
}

.btn-close {
    background: transparent;
    border: none;
    font-size: 32px;
    cursor: pointer;
    color: var(--color-text-muted);
    line-height: 1;
    padding: 0;
    width: 32px;
    height: 32px;
    transition: all 0.2s;
}

.btn-close:hover {
    color: var(--color-accent);
}

.modal-body {
    padding: 24px;
}

.modal-footer {
    padding: 24px;
    border-top: 2px solid var(--color-border);
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    background: var(--color-bg);
}

/* Toast */
.toast {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background: var(--color-surface);
    border: 2px solid;
    padding: 16px 24px;
    box-shadow: var(--shadow-lg);
    transform: translateX(400px);
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    z-index: 2000;
    max-width: 320px;
    font-size: 14px;
    font-weight: 600;
}

.toast.show {
    transform: translateX(0);
    opacity: 1;
}

.toast.success {
    border-color: #27ae60;
    color: #27ae60;
}

.toast.error {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

/* Teacher View */
.teacher-view-header {
    background: var(--color-surface);
    border-bottom: 2px solid var(--color-border);
    padding: 32px;
    box-shadow: var(--shadow-sm);
}

.teacher-view-header h1 {
    font-family: var(--font-display);
    font-size: 36px;
    font-weight: 400;
    margin-bottom: 20px;
    color: var(--color-text-primary);
}

.teacher-info {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    padding: 20px;
}

.teacher-view-content {
    padding: 40px 32px;
    max-width: 1400px;
    margin: 0 auto;
}

.quota-section {
    margin-top: 48px;
}

.quota-section h3 {
    font-family: var(--font-display);
    font-size: 28px;
    font-weight: 400;
    margin-bottom: 24px;
    color: var(--color-text-primary);
}

.quota-logs {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.quota-log-item {
    padding: 20px;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.2s;
}

.quota-log-item:hover {
    background: var(--color-bg);
}

.quota-log-item:last-child {
    border-bottom: none;
}

.quota-log-date {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--color-text-muted);
    text-transform: uppercase;
}

.quota-log-amount {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: 28px;
}

.quota-log-amount.positive {
    color: #27ae60;
}

.quota-log-amount.negative {
    color: var(--color-accent);
}

/* Info Box */
.info-box {
    background: rgba(192, 57, 43, 0.05);
    border: 1px solid rgba(192, 57, 43, 0.2);
    padding: 16px;
    font-size: 13px;
    color: var(--color-text-muted);
    margin-bottom: 20px;
}

/* Copy Link */
.copy-link-box {
    display: flex;
    gap: 12px;
    align-items: center;
}

.copy-link-box input {
    flex: 1;
    font-size: 12px;
}

/* Responsive */
@media (max-width: 768px) {
    .auth-container {
        padding: 32px 24px;
    }

    .app-content {
        padding: 24px 16px;
    }

    .header-content {
        padding: 20px;
    }

    .tabs {
        padding: 0 20px;
    }

    .card-list {
        grid-template-columns: 1fr;
    }

    .schedule-grid {
        grid-template-columns: 60px repeat(7, 1fr);
        font-size: 11px;
    }

    .schedule-header-cell,
    .schedule-time-cell {
        padding: 12px 8px;
        font-size: 10px;
    }

    .schedule-cell {
        min-height: 80px;
        padding: 8px;
    }

    .class-block {
        padding: 8px;
        font-size: 12px;
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }

    .schedule-header {
        flex-direction: column;
        align-items: stretch;
    }

    .date-nav {
        justify-content: center;
    }

    .auth-header h1 {
        font-size: 32px;
    }
}

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

.empty-state-icon {
    font-size: 64px;
    margin-bottom: 20px;
    opacity: 0.3;
}

.empty-state h3 {
    font-family: var(--font-display);
    font-size: 24px;
    margin-bottom: 12px;
    color: var(--color-text-primary);
    font-weight: 400;
}

.empty-state p {
    font-size: 14px;
    color: var(--color-text-muted);
}