/* ZenDawn Sleep Calculator - Styles */

/* CSS Variables */
:root {
    --color-primary: #6366f1;
    --color-primary-dark: #4f46e5;
    --color-primary-light: #818cf8;
    --color-secondary: #10b981;
    --color-background: #0f172a;
    --color-surface: #1e293b;
    --color-surface-light: #334155;
    --color-border: #475569;
    --color-text-primary: #f1f5f9;
    --color-text-secondary: #cbd5e1;
    --color-text-muted: #94a3b8;
    --color-accent: #f59e0b;
    --color-warning: #ef4444;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.3);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.4);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.5);
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.5rem;
}

h4 {
    font-size: 1.25rem;
}

p {
    margin-bottom: 1rem;
    color: var(--color-text-secondary);
}

a {
    color: var(--color-primary-light);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--color-primary);
    text-decoration: underline;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Header */
header {
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary-light);
    text-decoration: none;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 2rem;
    align-items: center;
}

nav a {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: var(--transition);
    font-weight: 500;
}

nav a:hover,
nav a.active {
    color: var(--color-primary-light);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
    padding: 4rem 0;
    text-align: center;
}

.hero h1 {
    color: white;
    margin-bottom: 1rem;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 2rem;
}

.trust-signal {
    display: inline-block;
    background: rgba(255, 255, 255, 0.1);
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    color: white;
    font-size: 0.95rem;
    backdrop-filter: blur(10px);
}

/* Main Content */
main {
    padding: 3rem 0;
}

/* Calculator Card */
.calculator-card {
    background: var(--color-surface);
    border-radius: var(--border-radius);
    padding: 2.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-lg);
}

.calculator-card h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--color-text-primary);
}

/* Calculator Steps */
.calculator-step {
    margin-bottom: 2rem;
}

.step-label {
    display: block;
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--color-text-primary);
}

/* Mode Selector */
.mode-selector {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.mode-btn {
    background: var(--color-surface-light);
    border: 2px solid var(--color-border);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--color-text-secondary);
    font-size: 1rem;
}

.mode-btn:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

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

.mode-icon {
    font-size: 2rem;
}

/* Time Input */
.time-input {
    width: 100%;
    padding: 1rem;
    font-size: 1.5rem;
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    background: var(--color-surface-light);
    color: var(--color-text-primary);
    transition: var(--transition);
}

.time-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* Slider */
.slider-container {
    position: relative;
}

.slider {
    width: 100%;
    height: 8px;
    border-radius: 5px;
    background: var(--color-surface-light);
    outline: none;
    appearance: none;
    -webkit-appearance: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--color-primary);
    cursor: pointer;
    transition: var(--transition);
}

.slider::-webkit-slider-thumb:hover {
    background: var(--color-primary-dark);
    transform: scale(1.1);
}

.slider::-moz-range-thumb {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--color-primary);
    cursor: pointer;
    border: none;
}

.slider-value {
    text-align: center;
    margin-top: 1rem;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-primary-light);
}

.help-text {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-top: 0.5rem;
}

/* Quiz Toggle */
.toggle-quiz-btn {
    width: 100%;
    background: var(--color-surface-light);
    border: 2px solid var(--color-border);
    padding: 1rem 1.5rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--color-text-primary);
    font-size: 1rem;
    transition: var(--transition);
}

.toggle-quiz-btn:hover {
    border-color: var(--color-primary);
}

.arrow {
    transition: transform 0.3s ease;
}

.toggle-quiz-btn.active .arrow {
    transform: rotate(180deg);
}

/* Chronotype Quiz */
.chronotype-quiz {
    margin-top: 1.5rem;
    padding: 1.5rem;
    background: var(--color-surface-light);
    border-radius: var(--border-radius);
    overflow: hidden;
    max-height: 0;
    opacity: 0;
    transition: all 0.5s ease;
}

.chronotype-quiz.visible {
    max-height: 2000px;
    opacity: 1;
}

.quiz-question {
    margin-bottom: 1.5rem;
}

.quiz-question:last-child {
    margin-bottom: 0;
}

.question-text {
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--color-text-primary);
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.quiz-options label {
    display: flex;
    align-items: center;
    padding: 0.75rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    color: var(--color-text-secondary);
}

.quiz-options label:hover {
    border-color: var(--color-primary);
    background: rgba(99, 102, 241, 0.1);
}

.quiz-options input[type="radio"] {
    margin-right: 0.75rem;
    cursor: pointer;
    accent-color: var(--color-primary);
}

/* Calculate Button */
.calculate-btn {
    width: 100%;
    padding: 1.25rem 2rem;
    font-size: 1.25rem;
    font-weight: 600;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
}

.calculate-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

/* Results Section */
.results-section {
    margin-top: 3rem;
}

.results-section.hidden {
    display: none;
}

/* Result Cards */
.result-card {
    background: var(--color-surface);
    border-radius: var(--border-radius);
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-lg);
}

.result-card h3 {
    margin-bottom: 1.5rem;
    color: var(--color-text-primary);
}

/* Main Result */
.main-result {
    text-align: center;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(79, 70, 229, 0.1) 100%);
    border: 2px solid var(--color-primary);
}

.result-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.result-time {
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--color-primary-light);
    margin: 1rem 0;
}

.result-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
}

.chronotype-result {
    margin-top: 1.5rem;
    padding: 1rem;
    background: rgba(99, 102, 241, 0.1);
    border-radius: 8px;
}

.chronotype-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--color-primary);
    color: white;
    border-radius: 20px;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

/* Cycle Info */
.cycle-info {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.cycle-stat {
    text-align: center;
    padding: 1.5rem;
    background: var(--color-surface-light);
    border-radius: var(--border-radius);
}

.stat-value {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary-light);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.95rem;
    color: var(--color-text-muted);
}

/* Sleep Timeline */
.sleep-timeline {
    margin: 2rem 0;
    padding: 1.5rem;
    background: var(--color-surface-light);
    border-radius: var(--border-radius);
}

.timeline-item {
    display: flex;
    align-items: center;
    padding: 0.75rem;
    margin-bottom: 0.5rem;
    background: var(--color-surface);
    border-radius: 8px;
    border-left: 4px solid var(--color-primary);
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-icon {
    font-size: 1.5rem;
    margin-right: 1rem;
}

.timeline-content {
    flex: 1;
}

.timeline-label {
    font-weight: 600;
    color: var(--color-text-primary);
}

.timeline-time {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

/* Info Box */
.info-box {
    padding: 1rem 1.25rem;
    background: rgba(16, 185, 129, 0.1);
    border-left: 4px solid var(--color-secondary);
    border-radius: 8px;
    margin-top: 1.5rem;
    color: var(--color-text-secondary);
}

.info-box strong {
    color: var(--color-text-primary);
}

/* Recommendations */
.section-intro {
    margin-bottom: 1.5rem;
    color: var(--color-text-secondary);
}

.recommendation-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.recommendation {
    display: flex;
    gap: 1.5rem;
    padding: 1.5rem;
    background: var(--color-surface-light);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.recommendation:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-md);
}

.rec-icon {
    font-size: 2.5rem;
    flex-shrink: 0;
}

.rec-content {
    flex: 1;
}

.rec-content h4 {
    margin-bottom: 0.5rem;
    color: var(--color-text-primary);
}

.rec-time {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-primary-light);
    margin-bottom: 0.5rem;
}

.rec-why {
    font-size: 0.95rem;
    color: var(--color-text-muted);
}

/* Premium Teaser */
.premium-teaser {
    margin-top: 2rem;
    padding: 1.5rem;
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.1) 0%, rgba(217, 119, 6, 0.1) 100%);
    border: 2px solid var(--color-accent);
    border-radius: var(--border-radius);
    text-align: center;
}

.premium-teaser h4 {
    color: var(--color-text-primary);
    margin-bottom: 0.5rem;
}

.premium-teaser p {
    margin-bottom: 1rem;
}

.waitlist-btn {
    padding: 0.75rem 1.5rem;
    background: var(--color-accent);
    color: var(--color-background);
    border: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.waitlist-btn:hover {
    background: #d97706;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Export Options */
.export-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}

.export-btn {
    padding: 1rem;
    background: var(--color-surface-light);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    color: var(--color-text-primary);
    font-size: 1rem;
    font-weight: 500;
}

.export-btn:hover {
    border-color: var(--color-primary);
    background: rgba(99, 102, 241, 0.1);
    transform: translateY(-2px);
}

/* Educational Content */
.educational-content {
    margin: 4rem 0;
}

.educational-content h2 {
    text-align: center;
    margin-bottom: 2.5rem;
}

.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.content-card {
    background: var(--color-surface);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.content-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.content-card h3 {
    margin-bottom: 1rem;
    color: var(--color-primary-light);
}

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

.citation a {
    color: var(--color-secondary);
}

/* FAQ Section */
.faq-section {
    margin: 4rem 0;
}

.faq-section h2 {
    text-align: center;
    margin-bottom: 2rem;
}

.faq-item {
    background: var(--color-surface);
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    overflow: hidden;
}

.faq-question {
    width: 100%;
    padding: 1.25rem 1.5rem;
    background: transparent;
    border: none;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text-primary);
    transition: var(--transition);
}

.faq-question:hover {
    background: var(--color-surface-light);
}

.faq-arrow {
    transition: transform 0.3s ease;
    font-size: 0.9rem;
}

.faq-item.active .faq-arrow {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer p {
    padding: 0 1.5rem 1.5rem 1.5rem;
    color: var(--color-text-secondary);
}

/* Disclaimer */
.disclaimer {
    margin: 3rem 0;
    padding: 1.5rem;
    background: var(--color-surface);
    border-left: 4px solid var(--color-warning);
    border-radius: var(--border-radius);
}

.disclaimer h3 {
    color: var(--color-warning);
    margin-bottom: 1rem;
}

.disclaimer p {
    margin-bottom: 0.75rem;
    font-size: 0.95rem;
}

/* Footer */
footer {
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: 3rem 0 1.5rem 0;
    margin-top: 4rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    color: var(--color-primary-light);
    margin-bottom: 1rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.footer-section a:hover {
    color: var(--color-primary-light);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.last-updated {
    margin-top: 0.5rem;
    font-size: 0.85rem;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    backdrop-filter: blur(5px);
}

.modal.hidden {
    display: none;
}

.modal-content {
    background: var(--color-surface);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    max-width: 500px;
    width: 90%;
    position: relative;
    box-shadow: var(--shadow-xl);
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: transparent;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    color: var(--color-text-muted);
    transition: var(--transition);
}

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

.modal-content h3 {
    margin-bottom: 1rem;
    color: var(--color-text-primary);
}

.modal-content p {
    margin-bottom: 1.5rem;
}

.modal-content form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.modal-content input[type="email"] {
    padding: 0.75rem;
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    background: var(--color-surface-light);
    color: var(--color-text-primary);
    font-size: 1rem;
}

.modal-content input[type="email"]:focus {
    outline: none;
    border-color: var(--color-primary);
}

.modal-content button[type="submit"] {
    padding: 0.75rem;
    background: var(--color-primary);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.modal-content button[type="submit"]:hover {
    background: var(--color-primary-dark);
}

.modal-note {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-top: 0.5rem;
}

/* Assessment Modal (Quiz) - Uses more specific naming to avoid ad blocker conflicts */
.assessment-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    backdrop-filter: blur(5px);
}

.assessment-modal-content {
    background: var(--color-surface);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    position: relative;
    box-shadow: var(--shadow-xl);
}

.assessment-modal-content h3 {
    margin-bottom: 1rem;
    color: var(--color-text-primary);
}

.assessment-modal-content p {
    margin-bottom: 1.5rem;
}

/* Utility Classes */
.hidden {
    display: none;
}

/* Responsive Design */
@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    .container {
        padding: 0 1rem;
    }

    .header-container {
        flex-direction: column;
        gap: 1rem;
    }

    nav ul {
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }

    .hero {
        padding: 2rem 0;
    }

    .hero h1 {
        font-size: 1.75rem;
    }

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

    .calculator-card {
        padding: 1.5rem;
    }

    .mode-selector {
        grid-template-columns: 1fr;
    }

    .result-time {
        font-size: 2.5rem;
    }

    .cycle-info {
        grid-template-columns: 1fr;
    }

    .export-options {
        grid-template-columns: 1fr;
    }

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

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus visible for accessibility */
*:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --color-border: #64748b;
        --color-text-muted: #cbd5e1;
    }
}

/* Print styles */
@media print {
    header,
    footer,
    .calculate-btn,
    .export-options,
    .premium-teaser,
    .waitlist-btn {
        display: none;
    }

    body {
        background: white;
        color: black;
    }

    .result-card {
        page-break-inside: avoid;
    }
}