/* Study Session Pomodoro Planner — Styles */

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

:root {
    --color-bg: #faf8f5;
    --color-surface: #ffffff;
    --color-surface-alt: #f5f0e8;
    --color-text: #2c2416;
    --color-text-muted: #6b5e4a;
    --color-accent: #b45309;
    --color-accent-light: #f59e0b;
    --color-accent-dark: #92400e;
    --color-success: #15803d;
    --color-success-bg: #dcfce7;
    --color-border: #e7dfd0;
    --color-focus-ring: #b45309;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.1);
    --font-sans: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', 'Fira Mono', 'Roboto Mono', monospace;
    --max-width: 1100px;
    --header-height: 64px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.skip-link {
    position: absolute;
    top: -100%;
    left: 16px;
    background: var(--color-accent);
    color: #fff;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    z-index: 1000;
    font-weight: 600;
    text-decoration: none;
}

.skip-link:focus {
    top: 12px;
}

.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.site-header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--header-height);
    display: flex;
    align-items: center;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-accent-dark);
    text-decoration: none;
}

.logo svg {
    color: var(--color-accent);
}

.nav-list {
    list-style: none;
    display: flex;
    gap: 24px;
}

.nav-list a {
    text-decoration: none;
    color: var(--color-text);
    font-weight: 500;
    font-size: 0.95rem;
    padding: 6px 0;
    border-bottom: 2px solid transparent;
    transition: border-color 0.2s, color 0.2s;
}

.nav-list a:hover,
.nav-list a:focus-visible {
    color: var(--color-accent);
    border-bottom-color: var(--color-accent);
    outline: none;
}

/* Hero */
.hero {
    padding: 60px 0 40px;
    text-align: center;
    background: linear-gradient(180deg, var(--color-surface-alt) 0%, var(--color-bg) 100%);
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--color-accent-dark);
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--color-text-muted);
    max-width: 640px;
    margin: 0 auto;
}

/* Planner Section */
.planner-section {
    padding: 48px 0;
}

.planner-section h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--color-text);
}

.planner-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    align-items: start;
}

.planner-form {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 28px;
    box-shadow: var(--shadow-sm);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 6px;
    color: var(--color-text);
}

.form-group textarea,
.form-group input,
.form-group select {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-family: var(--font-sans);
    font-size: 0.95rem;
    background: var(--color-bg);
    color: var(--color-text);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group textarea:focus,
.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(180, 83, 9, 0.15);
}

.form-group textarea {
    resize: vertical;
    min-height: 90px;
}

.form-hint {
    display: block;
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-top: 4px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    background: var(--color-accent);
    color: #fff;
    font-weight: 600;
    font-size: 1rem;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
    width: 100%;
}

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

.btn-primary:active {
    transform: scale(0.98);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    background: var(--color-accent-light);
    color: var(--color-accent-dark);
    font-weight: 600;
    font-size: 0.95rem;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background 0.2s;
}

.btn-secondary:hover {
    background: #e5a50a;
}

.btn-outline {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    background: transparent;
    color: var(--color-text);
    font-weight: 600;
    font-size: 0.95rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background 0.2s, border-color 0.2s;
}

.btn-outline:hover {
    background: var(--color-surface-alt);
    border-color: var(--color-accent);
}

.plan-output {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 28px;
    min-height: 320px;
    box-shadow: var(--shadow-sm);
}

.plan-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--color-text-muted);
    height: 100%;
    min-height: 260px;
    gap: 16px;
}

.plan-placeholder svg {
    opacity: 0.5;
}

.plan-blocks {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.plan-block {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    font-size: 0.9rem;
}

.plan-block.focus-block {
    border-left: 4px solid var(--color-accent);
}

.plan-block.break-block {
    border-left: 4px solid var(--color-success);
}

.plan-block .block-icon {
    font-size: 1.2rem;
}

.plan-block .block-details {
    flex: 1;
}

.plan-block .block-duration {
    font-weight: 700;
    color: var(--color-text-muted);
}

.plan-summary {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--color-border);
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* Timer Section */
.timer-section {
    padding: 48px 0;
    background: var(--color-surface-alt);
}

.timer-section h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 24px;
    text-align: center;
}

.timer-card {
    max-width: 480px;
    margin: 0 auto;
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: 36px;
    box-shadow: var(--shadow-md);
    text-align: center;
}

.current-block-info {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-bottom: 24px;
}

.current-subject {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-accent-dark);
}

.block-type {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.timer-display {
    font-family: var(--font-mono);
    font-size: 4rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 24px;
    letter-spacing: 0.02em;
}

.timer-controls {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-bottom: 24px;
}

.timer-controls button {
    width: auto;
    min-width: 100px;
}

.progress-bar-container {
    width: 100%;
    height: 6px;
    background: var(--color-border);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 12px;
}

.progress-bar {
    height: 100%;
    background: var(--color-accent);
    border-radius: 3px;
    transition: width 0.3s linear;
}

.next-block-preview {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* Summary Section */
.summary-section {
    padding: 48px 0;
}

.summary-section h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 24px;
    text-align: center;
}

.summary-content {
    max-width: 600px;
    margin: 0 auto;
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
}

.summary-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 24px;
}

.summary-stat {
    text-align: center;
    padding: 16px;
    background: var(--color-bg);
    border-radius: var(--radius-sm);
}

.summary-stat .stat-value {
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-accent);
}

.summary-stat .stat-label {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-top: 4px;
}

.summary-completed-blocks {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.summary-completed-blocks li {
    padding: 8px 12px;
    background: var(--color-success-bg);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    display: flex;
    justify-content: space-between;
}

/* How It Works */
.how-it-works {
    padding: 48px 0;
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
}

.how-it-works h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 32px;
    text-align: center;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
}

.feature-card {
    padding: 24px;
    background: var(--color-bg);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

.feature-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--color-accent-dark);
}

.feature-card p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.5;
}

/* Tips */
.tips-section {
    padding: 48px 0;
}

.tips-section h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 24px;
    text-align: center;
}

.tips-list {
    max-width: 680px;
    margin: 0 auto;
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.tips-list li {
    padding: 14px 18px;
    background: var(--color-surface);
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    font-size: 0.95rem;
    line-height: 1.5;
}

.tips-list li strong {
    color: var(--color-accent-dark);
}

/* Footer */
.site-footer {
    margin-top: auto;
    padding: 32px 0;
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer-links {
    display: flex;
    gap: 24px;
    justify-content: center;
    margin-bottom: 12px;
}

.footer-links a {
    text-decoration: none;
    color: var(--color-text-muted);
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: var(--color-accent);
}

.footer-note {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

/* About Page */
.about-page {
    padding: 60px 0;
}

.about-page .container {
    max-width: 720px;
}

.about-page h1 {
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-accent-dark);
    margin-bottom: 24px;
}

.about-content {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-text);
}

/* Legal Pages */
.legal-page {
    padding: 60px 0;
}

.legal-page .container {
    max-width: 720px;
}

.legal-page h1 {
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-accent-dark);
    margin-bottom: 24px;
}

.legal-content {
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--color-text);
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 1.8rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

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

    .form-row {
        grid-template-columns: 1fr;
    }

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

    .timer-display {
        font-size: 3rem;
    }

    .timer-controls {
        flex-direction: column;
        align-items: center;
    }

    .summary-stats {
        grid-template-columns: 1fr;
    }

    .nav-list {
        gap: 14px;
    }

    .logo span {
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 40px 0 24px;
    }

    .hero h1 {
        font-size: 1.5rem;
    }

    .planner-form,
    .plan-output,
    .timer-card,
    .summary-content {
        padding: 20px;
    }

    .timer-display {
        font-size: 2.5rem;
    }
}

/* Utility */
[hidden] {
    display: none !important;
}



/* Factory-injected deployment helpers. The AI owns the site design above this block. */
.ad-unit {
  width: min(100%, 720px);
  min-height: 120px;
  margin: 24px auto;
  display: block;
}

.legal-page {
  width: min(900px, calc(100% - 32px));
  margin: 40px auto;
}

.factory-fallback-nav {
  width: min(900px, calc(100% - 32px));
  margin: 24px auto 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  align-items: center;
  font-size: 0.95rem;
}

.factory-fallback-nav a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}