/* ===================================
   Couleur Vert d'Eau - Stylesheet
   A serene, water-green aesthetic
   =================================== */

/* CSS Variables */
:root {
    /* Primary palette - Water green tones */
    --color-primary: #7FB3A8;
    --color-primary-light: #A8CFC7;
    --color-primary-dark: #5A9A8C;
    --color-primary-pale: #E8F4F1;

    /* Secondary palette */
    --color-secondary: #D4A574;
    --color-secondary-light: #E8C9A8;

    /* Neutrals */
    --color-white: #FFFFFF;
    --color-cream: #FDFCFA;
    --color-text: #3D4A47;
    --color-text-light: #6B7A75;
    --color-text-muted: #9BA8A3;

    /* Accent */
    --color-accent: #E8B4A8;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(127, 179, 168, 0.08);
    --shadow-md: 0 4px 20px rgba(127, 179, 168, 0.12);
    --shadow-lg: 0 8px 40px rgba(127, 179, 168, 0.16);

    /* Typography */
    --font-display: 'Cormorant Garamond', Georgia, serif;
    --font-body: 'Nunito', -apple-system, BlinkMacSystemFont, sans-serif;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 5rem;

    /* Border radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-full: 50%;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    color: var(--color-text);
    background-color: var(--color-cream);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

ul {
    list-style: none;
}

/* Typography */
h1, h2, h3, h4 {
    font-family: var(--font-display);
    font-weight: 500;
    line-height: 1.3;
    color: var(--color-text);
}

h1 {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 400;
}

h2 {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    margin-bottom: var(--space-md);
    text-align: center;
}

h3 {
    font-size: 1.3rem;
    font-weight: 500;
}

p {
    margin-bottom: var(--space-sm);
}

strong {
    font-weight: 600;
    color: var(--color-primary-dark);
}

/* Layout */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.section {
    padding: var(--space-2xl) 0;
}

.section-subtitle {
    text-align: center;
    color: var(--color-text-light);
    font-size: 1.1rem;
    margin-bottom: var(--space-xl);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-sm) var(--space-lg);
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
}

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

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-large {
    padding: var(--space-md) var(--space-xl);
    font-size: 1.1rem;
    width: 100%;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(253, 252, 250, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(127, 179, 168, 0.1);
}

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

.logo {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--color-primary-dark);
}

.nav-links {
    display: flex;
    gap: var(--space-lg);
}

.nav-links a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text-light);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-primary);
    transition: width var(--transition-base);
}

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

.nav-links a:hover::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-xs);
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-text);
    transition: all var(--transition-fast);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: calc(80px + var(--space-xl)) var(--space-md) var(--space-xl);
    background: linear-gradient(135deg, var(--color-primary-pale) 0%, var(--color-cream) 50%, var(--color-white) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 80%;
    height: 150%;
    background: radial-gradient(ellipse, rgba(127, 179, 168, 0.1) 0%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    flex: 1;
    max-width: 600px;
    text-align: center;
    z-index: 1;
}

.hero h1 {
    color: var(--color-primary-dark);
    margin-bottom: var(--space-sm);
}

.hero-subtitle {
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-style: italic;
    color: var(--color-text-light);
    margin-bottom: var(--space-md);
}

.hero-description {
    font-size: 1.1rem;
    color: var(--color-text-light);
    margin-bottom: var(--space-lg);
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.hero-visual {
    display: none;
}

/* Envelope Animation */
.envelope {
    width: 200px;
    height: 140px;
    position: relative;
    perspective: 1000px;
}

.envelope-body {
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, var(--color-white) 0%, #f5f5f5 100%);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

.envelope-flap {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 70px;
    background: linear-gradient(180deg, var(--color-primary-light) 0%, var(--color-primary) 100%);
    clip-path: polygon(0 0, 50% 100%, 100% 0);
    transform-origin: top center;
    animation: flapOpen 3s ease-in-out infinite;
    z-index: 2;
}

.letter {
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: 160px;
    height: 100px;
    background: var(--color-white);
    border: 2px solid var(--color-primary-pale);
    border-radius: var(--radius-sm);
    animation: letterPeek 3s ease-in-out infinite;
}

.letter::before {
    content: '';
    position: absolute;
    top: 20px;
    left: 15px;
    right: 15px;
    height: 2px;
    background: var(--color-primary-light);
    box-shadow:
        0 12px 0 var(--color-primary-pale),
        0 24px 0 var(--color-primary-pale),
        0 36px 0 var(--color-primary-pale);
}

@keyframes flapOpen {
    0%, 100% { transform: rotateX(0deg); }
    50% { transform: rotateX(-30deg); }
}

@keyframes letterPeek {
    0%, 100% { top: 20px; }
    50% { top: 5px; }
}

/* About Section */
.about {
    background-color: var(--color-white);
}

.about-grid {
    display: grid;
    gap: var(--space-xl);
    margin-top: var(--space-xl);
}

.about-text {
    font-size: 1.05rem;
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.about-text p {
    margin-bottom: var(--space-md);
}

.about-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-lg);
    margin-top: var(--space-lg);
}

.feature {
    text-align: center;
    padding: var(--space-lg);
    background: var(--color-primary-pale);
    border-radius: var(--radius-lg);
    transition: transform var(--transition-base);
}

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

.feature-icon {
    font-size: 2rem;
    margin-bottom: var(--space-sm);
    color: var(--color-primary-dark);
}

.feature h3 {
    margin-bottom: var(--space-xs);
    color: var(--color-primary-dark);
}

.feature p {
    font-size: 0.9rem;
    color: var(--color-text-light);
    margin-bottom: 0;
}

/* Contents Section */
.contents {
    background: linear-gradient(180deg, var(--color-cream) 0%, var(--color-primary-pale) 100%);
}

.contents-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-lg);
}

.content-card {
    background: var(--color-white);
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: all var(--transition-base);
}

.content-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.card-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--space-md);
    color: var(--color-primary);
}

.card-icon svg {
    width: 100%;
    height: 100%;
}

.content-card h3 {
    margin-bottom: var(--space-sm);
    color: var(--color-primary-dark);
}

.content-card p {
    color: var(--color-text-light);
    margin-bottom: 0;
}

/* Subscribe Section */
.subscribe {
    background: var(--color-white);
}

.subscription-card {
    max-width: 500px;
    margin: 0 auto;
    background: linear-gradient(135deg, var(--color-primary-pale) 0%, var(--color-white) 100%);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(127, 179, 168, 0.2);
}

.price-note {
    font-size: 0.9rem;
    opacity: 0.9;
    margin-top: var(--space-xs);
    margin-bottom: 0;
    transition: all var(--transition-base);
}

#btn-price {
    font-weight: 600;
}

.price-change {
    animation: priceFlash 0.4s ease;
}

@keyframes priceFlash {
    0% { transform: scale(1); }
    50% { transform: scale(1.15); color: var(--color-secondary); }
    100% { transform: scale(1); }
}

.subscription-header {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    padding: var(--space-xl);
    text-align: center;
    color: var(--color-white);
}

.subscription-badge {
    display: inline-block;
    padding: var(--space-xs) var(--space-sm);
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: var(--space-sm);
}

.subscription-header h3 {
    font-family: var(--font-display);
    font-size: 1.8rem;
    color: var(--color-white);
    margin-bottom: var(--space-md);
}

.subscription-price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 4px;
}

.subscription-price .price {
    font-family: var(--font-display);
    font-size: 4rem;
    font-weight: 600;
    line-height: 1;
}

.subscription-price .currency {
    font-size: 1.5rem;
    font-weight: 500;
}

.subscription-price .period {
    font-size: 1rem;
    opacity: 0.8;
}

.subscription-body {
    padding: var(--space-xl);
}

.subscription-features {
    margin-bottom: var(--space-lg);
}

.subscription-features li {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
    padding: var(--space-sm) 0;
    border-bottom: 1px solid rgba(127, 179, 168, 0.1);
}

.subscription-features li:last-child {
    border-bottom: none;
}

.subscription-features .check {
    color: var(--color-primary);
    font-weight: 600;
    flex-shrink: 0;
}

.subscription-note {
    text-align: center;
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-top: var(--space-sm);
    margin-bottom: 0;
}

/* Subscription Form */
.subscription-form {
    margin-top: var(--space-lg);
}

.form-section {
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid rgba(127, 179, 168, 0.2);
}

.form-section:last-of-type {
    border-bottom: none;
    margin-bottom: var(--space-md);
    padding-bottom: 0;
}

.form-section h4 {
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-primary-dark);
    margin-bottom: var(--space-md);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-sm);
}

.form-group {
    margin-bottom: var(--space-sm);
}

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: var(--space-xs);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: var(--space-sm);
    font-family: var(--font-body);
    font-size: 1rem;
    color: var(--color-text);
    background: var(--color-white);
    border: 1px solid rgba(127, 179, 168, 0.3);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(127, 179, 168, 0.15);
}

.form-group input::placeholder {
    color: var(--color-text-muted);
}

.form-group input:invalid:not(:placeholder-shown) {
    border-color: var(--color-accent);
}

.form-group select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236B7A75' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--space-sm) center;
    padding-right: var(--space-lg);
}

@media (max-width: 480px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}

/* FAQ Section */
.faq {
    background: var(--color-primary-pale);
}

.faq-list {
    max-width: 700px;
    margin: 0 auto;
}

.faq-item {
    background: var(--color-white);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-sm);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.faq-item summary {
    padding: var(--space-md);
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: background-color var(--transition-fast);
}

.faq-item summary:hover {
    background-color: var(--color-primary-pale);
}

.faq-item summary::marker,
.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: '+';
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--color-primary);
    transition: transform var(--transition-fast);
}

.faq-item[open] summary::after {
    transform: rotate(45deg);
}

.faq-item p {
    padding: 0 var(--space-md) var(--space-md);
    color: var(--color-text-light);
    margin-bottom: 0;
}

/* Footer */
.footer {
    background-color: var(--color-text);
    color: var(--color-white);
    padding: var(--space-2xl) 0 var(--space-lg);
}

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

.footer-brand h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--color-primary-light);
    margin-bottom: var(--space-sm);
}

.footer-brand p {
    color: var(--color-text-muted);
    margin-bottom: 0;
}

.footer h4 {
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--color-primary-light);
    margin-bottom: var(--space-md);
}

.footer-links li {
    margin-bottom: var(--space-xs);
}

.footer-links a {
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
}

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

.social-links {
    display: flex;
    gap: var(--space-sm);
}

.social-links a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(127, 179, 168, 0.1);
    border-radius: var(--radius-full);
    color: var(--color-primary-light);
    transition: all var(--transition-fast);
}

.social-links a:hover {
    background: var(--color-primary);
    color: var(--color-white);
}

.social-links svg {
    width: 20px;
    height: 20px;
}

.footer-bottom {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-md);
    padding-top: var(--space-lg);
    border-top: 1px solid rgba(127, 179, 168, 0.2);
}

.footer-bottom p {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin-bottom: 0;
}

.footer-legal {
    display: flex;
    gap: var(--space-md);
}

.footer-legal a {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

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

/* Mobile Responsive */
@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }

    .nav-links {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--color-white);
        padding: var(--space-md);
        gap: 0;
        box-shadow: var(--shadow-md);
        display: none;
    }

    .nav-links.active {
        display: flex;
    }

    .nav-links li {
        border-bottom: 1px solid var(--color-primary-pale);
    }

    .nav-links li:last-child {
        border-bottom: none;
    }

    .nav-links a {
        display: block;
        padding: var(--space-sm) 0;
    }

    .hero {
        text-align: center;
        padding-top: calc(70px + var(--space-lg));
    }

    .hero-content {
        max-width: 100%;
    }

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

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

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

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

    .social-links {
        justify-content: center;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

@media (min-width: 769px) {
    .hero {
        flex-direction: row;
        text-align: left;
        gap: var(--space-2xl);
    }

    .hero-content {
        text-align: left;
    }

    .hero-description {
        margin-left: 0;
    }

    .hero-visual {
        display: flex;
        align-items: center;
        justify-content: center;
        flex: 0 0 auto;
    }
}

/* Loading State */
.btn.loading {
    position: relative;
    color: transparent;
    pointer-events: none;
}

.btn.loading::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    border: 2px solid transparent;
    border-top-color: var(--color-white);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Success/Error states */
.message {
    padding: var(--space-md);
    border-radius: var(--radius-md);
    margin-top: var(--space-md);
    text-align: center;
}

.message-success {
    background: rgba(127, 179, 168, 0.1);
    color: var(--color-primary-dark);
    border: 1px solid var(--color-primary-light);
}

.message-error {
    background: rgba(232, 180, 168, 0.1);
    color: #c47c6c;
    border: 1px solid var(--color-accent);
}