/* NivellCat – Landing Page Styles */

:root {
    --text-primary: #1a1a1a;
    --text-secondary: #666;
    --border-color: #e0e0e0;
    --bg-light: #f9f9f9;
    --accent: #0f766e;
    --accent-hover: #115e59;
    --on-accent: #fff;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
}

@media (prefers-color-scheme: dark) {
    :root {
        --text-primary: #f0f0f0;
        --text-secondary: #a0a0a0;
        --border-color: #3a3a3a;
        --bg-light: #1f1f1f;
        --accent: #2dd4bf;
        --accent-hover: #5eead4;
        --on-accent: #0a0a0a;
    }
}

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

html {
    scroll-behavior: smooth;
    /* --header-height is set from JS; 5rem is the fallback for desktop */
    scroll-padding-top: calc(var(--header-height, 5rem) + var(--spacing-sm));
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    color: var(--text-primary);
    background-color: #fff;
    line-height: 1.6;
}

@media (prefers-color-scheme: dark) {
    body {
        background-color: #0a0a0a;
    }
}

/* Header & Navigation */
header {
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md) var(--spacing-sm);
    position: sticky;
    top: 0;
    background-color: #fff;
    z-index: 100;
}

@media (prefers-color-scheme: dark) {
    header {
        background-color: #0a0a0a;
    }
}

nav {
    max-width: 64rem;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
}

.logo {
    display: block;
    line-height: 0;
}

.logo img {
    height: 2.5rem;
    width: auto;
}

nav ul {
    list-style: none;
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    transition: color 0.2s;
}

nav a:hover,
nav a:focus {
    color: var(--accent);
    outline: none;
}

nav a:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    border-radius: 2px;
}

@media (max-width: 640px) {
    nav {
        flex-direction: column;
        align-items: flex-start;
    }

    nav ul {
        flex-direction: column;
        gap: var(--spacing-sm);
        width: 100%;
    }
}

/* Main Content */
main {
    max-width: 64rem;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

/* Hero Section */
.hero {
    padding: var(--spacing-xl) var(--spacing-sm);
    text-align: center;
}

.hero h1 {
    font-size: clamp(1.75rem, 5vw, 2.5rem);
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    max-width: 50rem;
    margin-left: auto;
    margin-right: auto;
}

/* Form Styles */
.signup-form {
    background-color: var(--bg-light);
    padding: var(--spacing-lg);
    border-radius: 0.5rem;
    max-width: 28rem;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.signup-form input[type="email"],
.signup-form input[type="checkbox"],
.signup-form input[type="radio"] {
    font-family: inherit;
}

.signup-form input[type="email"] {
    padding: var(--spacing-sm);
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    font-size: 1rem;
    color: var(--text-primary);
    background-color: #fff;
    transition: border-color 0.2s;
}

@media (prefers-color-scheme: dark) {
    .signup-form input[type="email"] {
        background-color: #1a1a1a;
    }
}

.signup-form input[type="email"]:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.15);
}

/* Radio Group */
.radio-group {
    border: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
}

.radio-group legend {
    width: 100%;
    padding: 0;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    font-size: 1.1rem;
    text-align: center;
}

.radio-group label {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    cursor: pointer;
    font-size: 1.15rem;
}

.radio-group input[type="radio"] {
    width: 1.25rem;
    height: 1.25rem;
    margin: 0;
    cursor: pointer;
    accent-color: var(--accent);
}

.radio-group input[type="radio"]:focus {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* Consent Checkbox */
.consent-label {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-xs);
    cursor: pointer;
    font-size: 0.9rem;
    line-height: 1.5;
    text-align: left;
}

.consent-label input[type="checkbox"] {
    cursor: pointer;
    margin-top: 0.25rem;
    flex-shrink: 0;
    accent-color: var(--accent);
}

.consent-label input[type="checkbox"]:focus {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.consent-label a {
    color: var(--accent);
    text-decoration: none;
}

.consent-label a:hover,
.consent-label a:focus {
    text-decoration: underline;
}

/* Buttons */
.btn-primary,
.btn-secondary {
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: 0.375rem;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s, color 0.2s;
    text-decoration: none;
    display: inline-block;
}

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

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

.btn-primary:focus {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.btn-secondary {
    background-color: transparent;
    color: var(--accent);
    border: 1px solid var(--accent);
}

.btn-secondary:hover {
    background-color: var(--bg-light);
}

.btn-secondary:focus {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* Sections */
.section {
    padding: var(--spacing-xl) var(--spacing-sm);
    border-bottom: 1px solid var(--border-color);
}

.section:last-of-type {
    border-bottom: none;
}

.section-centered {
    text-align: center;
}

.section-centered > p {
    margin-left: auto;
    margin-right: auto;
}

.section-form {
    background-color: var(--bg-light);
}

.section-form h2 {
    text-align: center;
}

.section h2 {
    font-size: clamp(1.5rem, 4vw, 2rem);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.section p {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.section > p {
    max-width: 50rem;
}

/* Features List */
.features {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
}

.features li {
    padding: var(--spacing-md);
    background-color: var(--bg-light);
    border-radius: 0.375rem;
}

.features li strong {
    color: var(--text-primary);
    display: block;
    margin-bottom: var(--spacing-xs);
}

/* Steps */
.steps {
    list-style: none;
    counter-reset: step;
    margin: var(--spacing-lg) 0;
}

.steps li {
    counter-increment: step;
    margin-bottom: var(--spacing-lg);
    padding-left: 3rem;
    position: relative;
}

.steps li::before {
    content: counter(step);
    position: absolute;
    left: 0;
    top: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    background-color: var(--accent);
    color: var(--on-accent);
    border-radius: 50%;
    font-weight: 600;
}

.steps h3 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.steps p {
    margin-bottom: 0;
    color: var(--text-secondary);
}

/* Definition List (FAQ) */
dl {
    margin: var(--spacing-lg) 0;
}

dt {
    font-weight: 600;
    color: var(--text-primary);
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-xs);
}

dt:first-child {
    margin-top: 0;
}

dd {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    margin-left: 0;
}

/* Survey Section */
.survey-section {
    background-color: var(--bg-light);
    padding: var(--spacing-lg);
    border-radius: 0.375rem;
    margin: var(--spacing-lg) auto;
    max-width: 28rem;
}

.survey-section h2 {
    margin-bottom: var(--spacing-sm);
    font-size: 1.25rem;
}

.survey-section p {
    margin-bottom: var(--spacing-md);
}

/* Back Link */
.back-link {
    margin-top: var(--spacing-xl);
}

.back-link a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 500;
}

.back-link a:hover,
.back-link a:focus {
    text-decoration: underline;
}

/* Footer */
footer {
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-lg) var(--spacing-sm);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

footer p {
    margin-bottom: var(--spacing-sm);
    max-width: 50rem;
}

footer ul {
    list-style: none;
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

footer a {
    color: var(--accent);
    text-decoration: none;
}

footer a:hover,
footer a:focus {
    text-decoration: underline;
}

/* Responsive */
@media (max-width: 768px) {
    .hero {
        padding: var(--spacing-lg) var(--spacing-sm);
    }

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

    .subtitle {
        font-size: 1rem;
    }

    .section {
        padding: var(--spacing-lg) var(--spacing-sm);
    }

    .steps li {
        padding-left: 2.5rem;
    }
}

@media (max-width: 480px) {
    header {
        padding: var(--spacing-sm);
    }

    nav {
        gap: var(--spacing-sm);
    }

    .logo img {
        height: 2rem;
    }

    nav ul {
        gap: var(--spacing-xs);
    }

    nav a {
        font-size: 0.9rem;
    }

    .hero {
        padding: var(--spacing-md) var(--spacing-sm);
    }

    .hero h1 {
        font-size: 1.25rem;
    }

    .subtitle {
        font-size: 0.95rem;
    }

    .signup-form {
        padding: var(--spacing-md);
    }

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

    .section h2 {
        font-size: 1.25rem;
    }

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

    footer {
        font-size: 0.85rem;
    }
}

/* Print Styles */
@media print {
    header {
        position: static;
    }

    body {
        background-color: #fff;
        color: #000;
    }

    a {
        color: inherit;
    }
}