/* ========================================
   KELP SURF SCHOOL - LANDING PAGE
   Dark moody, rugged coastal aesthetic
   ======================================== */

/* CSS Variables - Color Palette */
:root {
    /* Base Colors */
    --color-bg-dark: #0f1419;
    --color-bg-slate: #1a1f2e;
    --color-bg-light: #2a3142;

    /* Accent Colors */
    --color-ocean-dark: #1a4d5c;
    --color-ocean-light: #2d7a8c;
    --color-cream: #f5f1e8;
    --color-cream-alt: #e8e3d8;
    --color-accent: #ff6b3d;

    /* Text Colors */
    --color-text-light: #f5f1e8;
    --color-text-muted: #b8b4a8;
    --color-text-dim: #7a7570;

    /* Sizing */
    --spacing-unit: 1rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    --spacing-xl: 4rem;
    --spacing-2xl: 6rem;

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-heading: 'Poppins', 'Inter', sans-serif;

    /* Transitions */
    --transition-fast: 200ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 600ms ease;
}

/* ========================================
   GLOBAL STYLES
   ======================================== */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg-dark);
    color: var(--color-text-light);
    line-height: 1.6;
    letter-spacing: 0.3px;
}

/* ========================================
   HEADER & NAVIGATION
   ======================================== */

.header {
    position: fixed;
    top: 0;
    width: 100%;
    background: linear-gradient(180deg, rgba(15, 20, 25, 0.95) 0%, rgba(15, 20, 25, 0.8) 100%);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid rgba(237, 237, 224, 0.05);
}

.navbar {
    padding: var(--spacing-md) 0;
}

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

.logo-text {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-cream);
    letter-spacing: 1px;
    text-transform: uppercase;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
}

.nav-links a {
    color: var(--color-text-muted);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color var(--transition-base);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

/* ========================================
   HERO SECTION
   ======================================== */

.hero {
    position: relative;
    width: 100%;
    height: 100vh;
    margin-top: 60px;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(15, 20, 25, 0.65) 0%, rgba(26, 77, 92, 0.5) 100%);
}

.hero-content {
    position: relative;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    z-index: 2;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 8vw, 4.5rem);
    font-weight: 700;
    color: var(--color-cream);
    margin-bottom: var(--spacing-lg);
    line-height: 1.2;
    max-width: 90%;
    text-shadow: 0 4px 12px rgba(0, 0, 0, 0.7);
}

.hero-subtitle {
    font-size: clamp(1rem, 2.5vw, 1.5rem);
    color: var(--color-cream-alt);
    max-width: 80%;
    margin-bottom: var(--spacing-xl);
    font-weight: 300;
    line-height: 1.8;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
}

/* ========================================
   CTA BUTTON
   ======================================== */

.cta-button {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-xl);
    background-color: var(--color-accent);
    color: white;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    text-transform: uppercase;
    letter-spacing: 1px;
    border-radius: 2px;
    box-shadow: 0 4px 15px rgba(255, 107, 61, 0.3);
}

.cta-button:hover {
    background-color: #ff5a2b;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 107, 61, 0.4);
}

.button-large {
    padding: 1rem 3rem;
    font-size: 1.1rem;
}

/* ========================================
   WAVE DIVIDERS
   ======================================== */

.wave-divider {
    display: block;
    width: 100%;
    height: 100px;
    color: var(--color-bg-slate);
    margin: 0;
}

/* ========================================
   SECTION CONTAINER & LAYOUT
   ======================================== */

.section-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

section {
    position: relative;
    padding: var(--spacing-2xl) 0;
}

.section-title {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    color: var(--color-cream);
    text-align: center;
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.section-subtitle {
    text-align: center;
    color: var(--color-text-muted);
    font-size: 1.15rem;
    margin-bottom: var(--spacing-2xl);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    font-weight: 300;
}

/* ========================================
   LESSONS SECTION
   ======================================== */

.lessons {
    background-color: var(--color-bg-dark);
}

.lessons-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.lesson-card {
    position: relative;
    height: 400px;
    border-radius: 4px;
    overflow: hidden;
    cursor: pointer;
    group: "lesson-card";
}

.lesson-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    transition: transform var(--transition-slow);
}

.lesson-card:hover .lesson-image {
    transform: scale(1.05);
}

.lesson-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, rgba(15, 20, 25, 0.3) 0%, rgba(15, 20, 25, 0.85) 100%);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: var(--spacing-lg);
    transition: background var(--transition-base);
}

.lesson-card:hover .lesson-overlay {
    background: linear-gradient(180deg, rgba(15, 20, 25, 0.2) 0%, rgba(15, 20, 25, 0.95) 100%);
}

.lesson-overlay h3 {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--color-cream);
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
}

.lesson-overlay p {
    color: var(--color-cream-alt);
    font-size: 0.95rem;
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.season {
    display: inline-block;
    background-color: var(--color-ocean-dark);
    color: var(--color-cream);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: 2px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Lesson Types */
.lesson-types {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    padding-top: var(--spacing-xl);
    border-top: 1px solid rgba(237, 237, 224, 0.1);
}

.lesson-type {
    padding: var(--spacing-lg);
    background-color: rgba(26, 31, 46, 0.5);
    border-left: 4px solid var(--color-ocean-light);
    border-radius: 2px;
    transition: transform var(--transition-base);
}

.lesson-type:hover {
    transform: translateX(8px);
}

.lesson-type h4 {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    color: var(--color-cream);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.lesson-type p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ========================================
   CREW SECTION
   ======================================== */

.crew {
    background: linear-gradient(180deg, var(--color-bg-dark) 0%, var(--color-bg-slate) 100%);
}

.crew-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    max-width: 1000px;
    margin: 0 auto;
}

.crew-member {
    text-align: center;
    animation: fadeInUp 0.8s ease-out;
}

.crew-image {
    width: 200px;
    height: 200px;
    margin: 0 auto var(--spacing-lg);
    border-radius: 50%;
    background-size: cover;
    background-position: center;
    border: 3px solid var(--color-ocean-light);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    transition: transform var(--transition-base);
}

.crew-member:hover .crew-image {
    transform: scale(1.08);
}

.crew-member h3 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    color: var(--color-cream);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.crew-role {
    color: var(--color-ocean-light);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-md);
}

.crew-bio {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ========================================
   BOOKING SECTION
   ======================================== */

.book {
    background-color: var(--color-bg-slate);
}

.book-content {
    max-width: 1200px;
}

.booking-form-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: start;
}

.booking-form {
    background-color: rgba(26, 31, 46, 0.5);
    padding: var(--spacing-2xl);
    border-radius: 4px;
    border: 1px solid rgba(237, 237, 224, 0.05);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.booking-form label {
    display: block;
    color: var(--color-cream);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.booking-form input,
.booking-form select,
.booking-form textarea {
    width: 100%;
    padding: var(--spacing-md);
    background-color: rgba(15, 20, 25, 0.6);
    border: 1px solid rgba(237, 237, 224, 0.1);
    color: var(--color-cream);
    font-family: var(--font-sans);
    font-size: 0.95rem;
    border-radius: 2px;
    transition: all var(--transition-base);
}

.booking-form input::placeholder,
.booking-form textarea::placeholder {
    color: var(--color-text-dim);
}

.booking-form input:focus,
.booking-form select:focus,
.booking-form textarea:focus {
    outline: none;
    background-color: rgba(15, 20, 25, 0.8);
    border-color: var(--color-ocean-light);
    box-shadow: 0 0 0 3px rgba(45, 122, 140, 0.2);
}

.booking-form button {
    width: 100%;
}

.booking-info {
    padding: var(--spacing-lg);
    background-color: rgba(26, 77, 92, 0.15);
    border-left: 4px solid var(--color-ocean-light);
    border-radius: 4px;
}

.booking-info h3 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    color: var(--color-cream);
    margin-bottom: var(--spacing-lg);
    font-weight: 600;
}

.booking-info ul {
    list-style: none;
}

.booking-info li {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-lg);
    position: relative;
    line-height: 1.7;
    font-size: 0.95rem;
}

.booking-info li:before {
    content: "▸";
    position: absolute;
    left: 0;
    color: var(--color-ocean-light);
    font-weight: bold;
}

/* ========================================
   FOOTER
   ======================================== */

.footer {
    background-color: var(--color-bg-slate);
    border-top: 1px solid rgba(237, 237, 224, 0.05);
    padding: var(--spacing-xl) 0;
    text-align: center;
}

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

.footer-subtitle {
    color: var(--color-text-dim);
    font-size: 0.85rem;
    margin-top: var(--spacing-sm);
    font-style: italic;
}

/* ========================================
   ANIMATIONS
   ======================================== */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* Intersection Observer animations (added via JS) */
.fade-in {
    animation: fadeInUp 0.8s ease-out forwards;
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */

@media (max-width: 768px) {
    .nav-links {
        gap: var(--spacing-lg);
    }

    .nav-links a {
        font-size: 0.85rem;
    }

    .hero {
        height: 70vh;
        margin-top: 50px;
    }

    .hero-title {
        font-size: clamp(1.5rem, 6vw, 2.5rem);
    }

    .hero-subtitle {
        font-size: 1rem;
        max-width: 90%;
    }

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

    .lesson-card {
        height: 350px;
    }

    .section-container {
        padding: 0 var(--spacing-md);
    }

    .crew-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

    .booking-form-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

    .booking-form {
        padding: var(--spacing-lg);
    }

    section {
        padding: var(--spacing-xl) 0;
    }

    .lesson-types {
        grid-template-columns: 1fr;
    }

    .wave-divider {
        height: 60px;
    }
}

@media (max-width: 480px) {
    .nav-container {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .logo-text {
        font-size: 1.5rem;
    }

    .nav-links {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }

    .hero {
        height: 60vh;
        margin-top: 40px;
    }

    .hero-title {
        font-size: 1.5rem;
        margin-bottom: var(--spacing-md);
    }

    .hero-subtitle {
        font-size: 0.9rem;
        margin-bottom: var(--spacing-lg);
    }

    .cta-button {
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: 0.9rem;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .section-subtitle {
        font-size: 0.95rem;
    }

    .lesson-card {
        height: 300px;
    }

    .crew-image {
        width: 150px;
        height: 150px;
        margin-bottom: var(--spacing-md);
    }

    .crew-member h3 {
        font-size: 1.25rem;
    }

    .booking-info {
        padding: var(--spacing-md);
        margin-top: var(--spacing-lg);
    }

    .footer {
        padding: var(--spacing-lg) 0;
    }
}