/* Intervals - Main Stylesheet */

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

:root {
    --navy: #0F172A;
    --white: #FFFFFF;
    --orange: #F59E0B;
    --gray-100: #F1F5F9;
    --gray-200: #E2E8F0;
    --gray-300: #CBD5E1;
    --gray-700: #334155;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--navy);
    background: var(--white);
}

/* ===== Navigation ===== */
nav {
    background: var(--navy);
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--white);
    font-size: 1.5rem;
    font-weight: 700;
}

.logo img {
    height: 40px;
    width: auto;
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    color: var(--gray-300);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-links a:hover {
    color: var(--orange);
}

/* ===== Hero Section ===== */
.hero {
    background: linear-gradient(135deg, var(--navy) 0%, #1E293B 100%);
    color: var(--white);
    padding: 6rem 2rem;
    text-align: center;
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    line-height: 1.1;
}

.hero h1 strong {
    color: var(--orange);
}

.hero p {
    font-size: 1.25rem;
    color: var(--gray-300);
    margin-bottom: 2.5rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* ===== Buttons ===== */
.btn {
    padding: 0.875rem 2rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    display: inline-block;
}

.btn-primary {
    background: var(--orange);
    color: var(--navy);
    border: 2px solid var(--orange);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(245, 158, 11, 0.4);
}

.btn-secondary {
    background: transparent;
    color: var(--white);
    border: 2px solid var(--gray-300);
}

.btn-secondary:hover {
    border-color: var(--orange);
    color: var(--orange);
}

/* ===== Sections ===== */
section {
    padding: 5rem 2rem;
}

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

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--navy);
    margin-bottom: 1rem;
}

.section-header p {
    font-size: 1.1rem;
    color: var(--gray-700);
    max-width: 600px;
    margin: 0 auto;
}

.section-subheader {
    margin-bottom: 1rem;
    color: var(--navy);
    font-size: 1.25rem;
    font-weight: 600;
}

/* ===== What is Intervals ===== */
#what-is {
    background: var(--gray-100);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.benefit-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    transition: transform 0.3s ease;
}

.benefit-card:hover {
    transform: translateY(-5px);
}

.benefit-card h3 {
    color: var(--orange);
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

.benefit-card p {
    color: var(--gray-700);
}

/* ===== How It Works ===== */
#how-it-works {
    background: var(--white);
}

.architecture-flow {
    background: var(--navy);
    color: var(--white);
    padding: 3rem;
    border-radius: 12px;
    margin: 3rem 0;
    text-align: center;
}

.flow-diagram {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
    font-size: 1.25rem;
    font-weight: 600;
    margin: 2rem 0;
}

.flow-box {
    padding: 1.5rem 2.5rem;
    border-radius: 8px;
    font-weight: 600;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.flow-box.light {
    background: var(--white);
    color: var(--navy);
}

.flow-box.orange {
    background: var(--orange);
    color: var(--navy);
    font-weight: 700;
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.4);
}

.flow-arrow {
    color: var(--orange);
    font-size: 2rem;
    margin: 0 1rem;
}

.flow-note {
    color: var(--gray-300);
    margin-top: 1.5rem;
    font-size: 0.95rem;
}

/* ===== Quick Integration ===== */
#integration {
    background: var(--gray-100);
}

.tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2rem;
    border-bottom: 2px solid var(--gray-200);
    padding-bottom: 0;
}

.tab-btn {
    padding: 0.75rem 1.5rem;
    background: transparent;
    border: none;
    color: var(--gray-700);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: all 0.3s ease;
}

.tab-btn:hover {
    color: var(--orange);
}

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

.tab-content {
    display: none;
}

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

.code-block {
    background: var(--navy);
    color: var(--gray-300);
    padding: 2rem;
    border-radius: 8px;
    margin: 2rem 0;
    overflow-x: auto;
}

.code-block pre {
    font-family: 'JetBrains Mono', 'Courier New', monospace;
    font-size: 0.95rem;
    line-height: 1.6;
}

.code-block .keyword {
    color: var(--orange);
}

.code-block .string {
    color: #10B981;
}

/* ===== Schedule Formats ===== */
#schedules {
    background: var(--white);
}

.format-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.format-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 12px;
    border: 2px solid var(--gray-200);
    transition: border-color 0.3s ease;
}

.format-card:hover {
    border-color: var(--orange);
}

.format-card h3 {
    color: var(--navy);
    margin-bottom: 1rem;
}

.format-card code {
    background: var(--gray-100);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    display: block;
    margin-top: 1rem;
    font-family: 'JetBrains Mono', monospace;
    color: var(--orange);
    word-break: break-all;
}

/* ===== Contact ===== */
#contact {
    background: var(--gray-100);
}

.contact-info {
    text-align: center;
    padding: 2rem;
    background: var(--white);
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    max-width: 600px;
    margin: 0 auto;
}

.contact-info a {
    color: var(--orange);
    font-weight: 600;
    font-size: 1.25rem;
    text-decoration: none;
}

.contact-info a:hover {
    text-decoration: underline;
}

/* ===== Footer ===== */
footer {
    background: var(--navy);
    color: var(--gray-300);
    padding: 3rem 2rem 2rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    color: var(--white);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.footer-section a {
    color: var(--gray-300);
    text-decoration: none;
    display: block;
    margin-bottom: 0.5rem;
    transition: color 0.3s ease;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--gray-700);
    color: var(--gray-700);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }

    .nav-links {
        display: none;
    }

    .section-header h2 {
        font-size: 2rem;
    }

    .architecture-flow {
        padding: 1.5rem;
    }

    .flow-diagram {
        flex-direction: column;
        gap: 1rem;
    }
}

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

.fade-in {
    animation: fadeIn 0.6s ease-out;
}