/* ============================================================
   karlin.vision – Stylesheet
   Local font: Outfit (SIL OFL 1.1) — see assets/fonts/outfit/OFL.txt
   ============================================================ */

@font-face {
    font-family: 'Outfit';
    font-style: normal;
    font-weight: 100 900;
    font-display: swap;
    src: url('assets/fonts/outfit/Outfit-VariableFont_wght.woff2') format('woff2-variations'),
         url('assets/fonts/outfit/Outfit-VariableFont_wght.woff2') format('woff2');
}

:root {
    /* Theme – dark, calm, technical */
    --bg-primary: #1a1e24;
    --bg-elevated: #21262e;
    --bg-muted: #161a1f;
    --surface-line: rgba(255, 255, 255, 0.08);
    --surface-line-strong: rgba(255, 255, 255, 0.16);

    --text-primary: #f1f3f5;
    --text-secondary: #b6bec9;
    --text-muted: #8a92a0;

    --accent: #e0f0f4;
    --accent-strong: #ffffff;
    --accent-dim: rgba(224, 240, 244, 0.6);

    --error: #ff8a80;

    --font-main: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    --container-width: 1180px;
    --nav-height: 76px;
    --section-spacing: 120px;

    --radius-sm: 4px;
    --radius-md: 10px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-main);
    font-weight: 300;
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ----- Typography ----- */
h1, h2, h3, h4 {
    color: var(--text-primary);
    font-weight: 200;
    line-height: 1.15;
    letter-spacing: -0.02em;
}

h1 {
    font-size: clamp(2.4rem, 5.6vw, 4.2rem);
    margin-bottom: 1.5rem;
    letter-spacing: -0.03em;
}

h2 {
    font-size: clamp(1.8rem, 3.4vw, 2.6rem);
    margin-bottom: 1.25rem;
    letter-spacing: -0.025em;
}

h3 {
    font-size: 1.25rem;
    font-weight: 500;
    margin-bottom: 0.75rem;
    letter-spacing: -0.01em;
}

p {
    color: var(--text-secondary);
    font-size: 1.05rem;
    margin-bottom: 1.25rem;
    max-width: 64ch;
    font-weight: 300;
}

p:last-child {
    margin-bottom: 0;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color 0.2s ease, opacity 0.2s ease;
}

.muted {
    color: var(--text-muted);
    font-weight: 300;
}

/* ----- Layout ----- */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

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

.section-muted {
    background-color: var(--bg-muted);
    border-top: 1px solid var(--surface-line);
    border-bottom: 1px solid var(--surface-line);
}

.section-head {
    margin-bottom: 3rem;
    max-width: 720px;
}

.section-label {
    display: inline-block;
    font-size: 0.78rem;
    font-weight: 400;
    color: var(--text-muted);
    letter-spacing: 0.18em;
    text-transform: uppercase;
    margin-bottom: 1rem;
}

.prose {
    max-width: 64ch;
}

/* ----- Navigation ----- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-height);
    background: rgba(26, 30, 36, 0.78);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--surface-line);
    z-index: 1000;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.05rem;
    font-weight: 400;
    letter-spacing: 0.02em;
    color: var(--text-primary);
}

.logo img {
    height: 32px;
    width: 32px;
    object-fit: contain;
    display: block;
}

.logo span {
    font-weight: 300;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 36px;
    align-items: center;
}

.nav-links a {
    font-size: 0.92rem;
    font-weight: 300;
    color: var(--text-secondary);
    position: relative;
    padding: 4px 0;
}

.nav-links a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -2px;
    width: 100%;
    height: 1px;
    background: var(--accent);
    transform: scaleX(0);
    transform-origin: left center;
    transition: transform 0.25s ease;
}

@media (hover: hover) {
    .nav-links a:hover {
        color: var(--text-primary);
    }
    .nav-links a:hover::after {
        transform: scaleX(1);
    }
}

/* ----- Buttons ----- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 28px;
    font-family: var(--font-main);
    font-size: 0.95rem;
    font-weight: 400;
    letter-spacing: 0.01em;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
    border: 1px solid transparent;
    text-decoration: none;
    line-height: 1;
}

.btn-primary {
    background-color: var(--accent-strong);
    color: var(--bg-primary);
    border-color: var(--accent-strong);
}

.btn-primary:active {
    transform: translateY(1px);
}

.btn-ghost {
    background-color: transparent;
    color: var(--text-primary);
    border-color: var(--surface-line-strong);
}

@media (hover: hover) {
    .btn-primary:hover {
        background-color: var(--accent);
        border-color: var(--accent);
    }
    .btn-ghost:hover {
        border-color: var(--accent);
        color: var(--accent);
    }
}

.btn-arrow {
    display: inline-block;
    transition: transform 0.2s ease;
}

@media (hover: hover) {
    .btn:hover .btn-arrow {
        transform: translateX(3px);
    }
}

/* ----- Hero ----- */
.hero {
    position: relative;
    min-height: 100vh;
    padding-top: calc(var(--nav-height) + 40px);
    padding-bottom: 80px;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
    pointer-events: none;
}

.hero-glow {
    position: absolute;
    top: -10%;
    left: 50%;
    transform: translateX(-50%);
    width: 120%;
    height: 120%;
    background: radial-gradient(ellipse at center top, rgba(224, 240, 244, 0.08) 0%, transparent 55%);
    filter: blur(20px);
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(var(--surface-line) 1px, transparent 1px),
        linear-gradient(90deg, var(--surface-line) 1px, transparent 1px);
    background-size: 80px 80px;
    background-position: center center;
    mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
    opacity: 0.55;
}

.hero .container {
    position: relative;
    z-index: 2;
    width: 100%;
}

.hero-content {
    max-width: 760px;
}

.hero-eyebrow {
    font-size: 0.85rem;
    color: var(--text-muted);
    letter-spacing: 0.22em;
    text-transform: uppercase;
    margin-bottom: 1.5rem;
    font-weight: 400;
}

.hero h1 {
    color: var(--text-primary);
    font-weight: 200;
}

.hero-subline {
    font-size: clamp(1.05rem, 1.6vw, 1.2rem);
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    max-width: 60ch;
    font-weight: 300;
}

.cta-group {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.hero-scroll {
    position: absolute;
    left: 50%;
    bottom: 32px;
    transform: translateX(-50%);
    width: 1px;
    height: 44px;
    background: var(--surface-line-strong);
    z-index: 2;
}

.hero-scroll span {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 40%;
    background: var(--accent);
    animation: scroll-pulse 2.2s ease-in-out infinite;
}

@keyframes scroll-pulse {
    0%   { transform: translateY(-100%); opacity: 0; }
    30%  { opacity: 1; }
    100% { transform: translateY(150%); opacity: 0; }
}

@media (prefers-reduced-motion: reduce) {
    .hero-scroll span { animation: none; }
}

/* ----- Themes Grid ----- */
.themes-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 1rem;
}

.theme-card {
    position: relative;
    padding: 36px 32px;
    background-color: var(--bg-elevated);
    border: 1px solid var(--surface-line);
    border-radius: var(--radius-md);
    transition: border-color 0.25s ease, transform 0.25s ease;
}

@media (hover: hover) {
    .theme-card:hover {
        border-color: var(--surface-line-strong);
        transform: translateY(-3px);
    }
}

.theme-index {
    display: block;
    font-size: 0.78rem;
    color: var(--text-muted);
    letter-spacing: 0.18em;
    margin-bottom: 1.5rem;
    font-weight: 400;
}

.theme-card h3 {
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    font-weight: 500;
}

.theme-card p {
    color: var(--text-secondary);
    font-size: 0.98rem;
    margin: 0;
}

/* ----- Referral (3D Visualisierung) ----- */
.referral {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 60px;
    align-items: center;
}

.referral-text .btn {
    margin-top: 1rem;
}

.referral-card {
    position: relative;
    aspect-ratio: 4 / 3;
    border-radius: var(--radius-md);
    background:
        linear-gradient(135deg, rgba(224,240,244,0.05) 0%, transparent 60%),
        var(--bg-elevated);
    border: 1px solid var(--surface-line);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.referral-card::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(var(--surface-line) 1px, transparent 1px),
        linear-gradient(90deg, var(--surface-line) 1px, transparent 1px);
    background-size: 32px 32px;
    opacity: 0.4;
    mask-image: radial-gradient(ellipse at center, black 0%, transparent 80%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 0%, transparent 80%);
}

.referral-card-inner {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 24px;
}

.referral-card-label {
    display: block;
    font-size: 0.72rem;
    letter-spacing: 0.22em;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-bottom: 1rem;
}

.referral-card-domain {
    display: block;
    font-size: clamp(1.4rem, 2.4vw, 1.9rem);
    color: var(--text-primary);
    font-weight: 300;
    letter-spacing: -0.01em;
    margin-bottom: 0.5rem;
}

.referral-card-meta {
    display: block;
    font-size: 0.85rem;
    color: var(--text-muted);
    letter-spacing: 0.04em;
}

/* ----- Contact ----- */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 60px;
    align-items: start;
}

.contact-info p {
    font-size: 1.05rem;
    color: var(--text-secondary);
}

.contact-note {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-top: 1.5rem;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 0.85rem;
    font-weight: 400;
    color: var(--text-secondary);
    letter-spacing: 0.02em;
}

.form-group input,
.form-group textarea {
    padding: 13px 14px;
    background-color: var(--bg-elevated);
    border: 1px solid var(--surface-line);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-main);
    font-size: 1rem;
    font-weight: 300;
    transition: border-color 0.2s ease, background-color 0.2s ease;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
    opacity: 0.7;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
    background-color: var(--bg-primary);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
    font-family: var(--font-main);
    line-height: 1.5;
}

.form-checkbox {
    flex-direction: row;
    align-items: center;
    gap: 12px;
    margin-top: 4px;
}

.form-checkbox input[type="checkbox"] {
    width: 16px;
    height: 16px;
    margin: 0;
    accent-color: var(--accent);
    flex-shrink: 0;
    cursor: pointer;
}

.form-checkbox label {
    font-size: 0.9rem;
    line-height: 1.5;
    color: var(--text-secondary);
    cursor: pointer;
}

.form-checkbox label a {
    color: var(--accent);
    text-decoration: underline;
}

.form-group input.is-invalid,
.form-group textarea.is-invalid {
    border-color: var(--error);
}

.form-checkbox input[type="checkbox"].is-invalid {
    outline: 2px solid var(--error);
    outline-offset: 2px;
}

.honeypot-field {
    position: absolute;
    left: -9999px;
    top: -9999px;
    height: 0;
    overflow: hidden;
}

.form-message {
    padding: 14px 16px;
    border-radius: var(--radius-sm);
    font-weight: 400;
    font-size: 0.95rem;
    text-align: center;
    margin-top: 6px;
}

.form-message.success {
    background-color: rgba(224, 240, 244, 0.1);
    border: 1px solid var(--accent);
    color: var(--accent);
}

.form-message.error {
    background-color: rgba(255, 138, 128, 0.08);
    border: 1px solid var(--error);
    color: var(--error);
}

/* ----- Footer ----- */
footer {
    padding: 36px 0;
    border-top: 1px solid var(--surface-line);
    background-color: var(--bg-muted);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 24px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.footer-right {
    display: flex;
    gap: 24px;
}

.footer-right a {
    color: var(--text-muted);
}

@media (hover: hover) {
    .footer-right a:hover {
        color: var(--accent);
    }
}

/* ----- Mobile Menu ----- */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 28px;
    height: 18px;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: 1001;
    padding: 0;
}

.hamburger span {
    display: block;
    width: 100%;
    height: 1.5px;
    background-color: var(--text-primary);
    border-radius: 1px;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5.5px, 6px);
}
.hamburger.active span:nth-child(2) {
    opacity: 0;
}
.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5.5px, -6px);
}

.mobile-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background-color: var(--bg-primary);
    z-index: 999;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s;
    padding-top: var(--nav-height);
}

.mobile-menu-overlay.active {
    opacity: 1;
    visibility: visible;
}

.mobile-nav {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    text-align: center;
}

.mobile-link {
    font-size: 1.6rem;
    font-weight: 300;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.mobile-link.small {
    font-size: 1rem;
    font-weight: 300;
    color: var(--text-muted);
    letter-spacing: 0.05em;
}

.mobile-divider {
    width: 32px;
    height: 1px;
    background-color: var(--surface-line-strong);
    margin: 12px 0;
}

/* ----- Reveal animation ----- */
.reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
    .reveal {
        opacity: 1;
        transform: none;
        transition: none;
    }
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 900px) {
    :root {
        --section-spacing: 80px;
    }

    .themes-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .referral {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .referral-card {
        aspect-ratio: 16 / 10;
    }

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 36px;
    }
}

@media (max-width: 768px) {
    .navbar .container {
        padding: 0 20px;
    }

    .desktop-nav {
        display: none;
    }

    .hamburger {
        display: flex;
    }

    .hero {
        min-height: auto;
        padding-top: calc(var(--nav-height) + 60px);
        padding-bottom: 100px;
    }

    .hero-grid {
        background-size: 50px 50px;
    }

    .cta-group {
        gap: 12px;
    }

    .cta-group .btn {
        width: 100%;
        justify-content: center;
    }

    .footer-content {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }
}

/* ============================================================
   Static legal pages
   ============================================================ */
.legal {
    padding-top: calc(var(--nav-height) + 60px);
    padding-bottom: 80px;
    min-height: 100vh;
}

.legal .container {
    max-width: 820px;
}

.legal h1 {
    font-size: clamp(2rem, 4vw, 2.8rem);
    margin-bottom: 2rem;
}

.legal h2 {
    font-size: 1.4rem;
    font-weight: 500;
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.legal h3 {
    font-size: 1.05rem;
    font-weight: 500;
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.legal p,
.legal li {
    color: var(--text-secondary);
    font-size: 0.98rem;
    margin-bottom: 1rem;
}

.legal a {
    color: var(--accent);
    text-decoration: underline;
}

.legal ul {
    list-style: disc;
    padding-left: 24px;
    margin-bottom: 1rem;
}

.legal strong {
    color: var(--text-primary);
    font-weight: 500;
}