/* ========================================
   Dr. Sven Seiler – seiler-coaching.eu
   Technology Leadership Coaching & Advisory
   ======================================== */

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

:root {
    --bg: #F5F6F8;
    --bg-white: #FFFFFF;
    --text: #1B2333;
    --text-muted: #5F6B7A;
    --primary: #1A56DB;
    --primary-hover: #1648B8;
    --primary-light: #E8EEFB;
    --secondary: #0F3460;
    --gray-100: #F0F2F5;
    --gray-200: #E2E5EA;
    --gray-300: #C8CDD5;
    --border: #DEE1E6;
    --font-sans: 'IBM Plex Sans', -apple-system, sans-serif;
    --font-serif: 'IBM Plex Serif', Georgia, serif;
    --max-w: 1160px;
    --pad: clamp(60px, 10vw, 100px);
}

html { scroll-behavior: smooth; }
body {
    font-family: var(--font-sans);
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}
.wrap { max-width: var(--max-w); margin: 0 auto; padding: 0 clamp(20px, 4vw, 40px); }

/* NAV */
nav {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
}
nav .wrap {
    display: flex; justify-content: space-between;
    align-items: center; height: 64px;
}
.nav-logo {
    text-decoration: none;
    display: flex; align-items: center;
    line-height: 0;
}
.nav-logo svg { height: 40px; width: auto; }
.nav-links { display: flex; gap: 28px; list-style: none; align-items: center; }
.nav-links a {
    color: var(--text-muted); text-decoration: none;
    font-size: 0.88rem; font-weight: 500; transition: color 0.3s;
}
.nav-links a:hover { color: var(--primary); }
.nav-links .nav-btn {
    background: var(--primary); color: #fff;
    padding: 8px 20px; border-radius: 6px;
    font-weight: 600;
}
.nav-links .nav-btn:hover { background: var(--primary-hover); color: #fff; }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 20px; height: 2px; background: var(--text); margin: 4px 0; transition: 0.3s; }

/* HERO */
.hero {
    padding-top: calc(64px + var(--pad));
    padding-bottom: var(--pad);
    background: var(--bg-white);
    border-bottom: 1px solid var(--border);
}
.hero .wrap {
    display: grid; grid-template-columns: 1.2fr 1fr;
    gap: 60px; align-items: center;
}
.hero-overline {
    display: inline-flex; align-items: center; gap: 8px;
    font-size: 0.78rem; font-weight: 600;
    color: var(--primary); letter-spacing: 0.05em;
    text-transform: uppercase; margin-bottom: 16px;
}
.hero-overline::before {
    content: ''; width: 24px; height: 2px;
    background: var(--primary);
}
.hero h1 {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 600; line-height: 1.2;
    margin-bottom: 20px; color: var(--secondary);
}
.hero p {
    font-size: clamp(0.95rem, 1.3vw, 1.05rem);
    color: var(--text-muted);
    max-width: 500px; margin-bottom: 32px;
}
.hero-img {
    background: var(--gray-100);
    border: 1px solid var(--border);
    border-radius: 8px;
    aspect-ratio: 4/3;
    display: flex; align-items: center; justify-content: center;
}
.hero-img span { color: var(--text-muted); font-size: 0.8rem; opacity: 0.5; }

/* BUTTONS */
.btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 12px 28px; border-radius: 6px; font-size: 0.88rem;
    font-weight: 600; text-decoration: none; transition: all 0.3s;
    cursor: pointer; border: none; font-family: var(--font-sans);
}
.btn-blue { background: var(--primary); color: #fff; }
.btn-blue:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(26, 86, 219, 0.25);
}
.btn-outline-blue {
    background: transparent; color: var(--primary);
    border: 1.5px solid var(--border);
}
.btn-outline-blue:hover { border-color: var(--primary); background: var(--primary-light); }
.btn-group { display: flex; gap: 12px; flex-wrap: wrap; }

/* SECTIONS */
section { padding: var(--pad) 0; }
.section-label {
    font-size: 0.72rem; font-weight: 700;
    letter-spacing: 0.12em; text-transform: uppercase;
    color: var(--primary); margin-bottom: 8px;
}
.section-title {
    font-family: var(--font-serif);
    font-size: clamp(1.6rem, 3vw, 2.2rem);
    font-weight: 600; line-height: 1.25;
    color: var(--secondary); margin-bottom: 12px;
}
.section-desc {
    color: var(--text-muted); max-width: 520px;
    font-size: 0.95rem;
}
.section-header { margin-bottom: 48px; }

/* CREDENTIALS */
.credentials {
    background: var(--bg-white);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    padding: 48px 0;
}
.credentials .wrap {
    display: grid; grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}
.cred-item {
    display: flex; align-items: center; gap: 16px;
    padding: 16px;
}
.cred-icon {
    width: 44px; height: 44px; border-radius: 8px;
    background: var(--primary-light);
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
}
.cred-text-title { font-weight: 700; font-size: 0.88rem; }
.cred-text-sub { font-size: 0.78rem; color: var(--text-muted); }

/* ABOUT */
.about { background: var(--bg-white); }
.about .wrap {
    display: grid; grid-template-columns: 1fr 1.3fr;
    gap: 64px; align-items: start;
}
.about-photo {
    aspect-ratio: 3/4; border-radius: 8px;
    background: var(--gray-100); border: 1px solid var(--border);
    display: flex; align-items: center; justify-content: center;
}
.about-photo span { color: var(--text-muted); font-size: 0.8rem; opacity: 0.5; }
.about-text p {
    color: var(--text-muted); font-size: 0.9rem; margin-bottom: 12px;
}
.about-text .section-desc { margin-bottom: 16px; }
.about-highlight {
    display: flex; align-items: center; gap: 12px;
    padding: 16px 20px; background: var(--primary-light);
    border-left: 3px solid var(--primary);
    border-radius: 0 6px 6px 0;
    margin-top: 24px; font-size: 0.88rem; font-weight: 500;
}
.about-highlight svg { flex-shrink: 0; }

/* PHILOSOPHIE */
.philosophie { background: var(--bg); }
.philosophie-content {
    max-width: 780px; margin: 0 auto;
}
.philosophie-content p {
    color: var(--text); font-size: 0.95rem;
    line-height: 1.8; margin-bottom: 20px;
}
.philosophie-content p:last-of-type { margin-bottom: 28px; }
.philosophie-content .about-highlight { max-width: 100%; }

/* AUSBILDUNG / HINTERGRUND */
.ausbildung { background: var(--bg); }
.ausbildung-grid {
    display: grid; grid-template-columns: 1.4fr 1fr;
    gap: 64px; align-items: start;
}
.ausbildung-column-title {
    font-family: var(--font-serif);
    font-size: 1.1rem; color: var(--secondary);
    margin-bottom: 20px;
}
.ausbildung-intro {
    max-width: 680px; margin: 0 auto;
    color: var(--text-muted); font-size: 0.92rem; line-height: 1.7;
}
.ausbildung-features {
    display: grid; grid-template-columns: 1fr 1fr;
    gap: 16px; margin-top: 28px;
}
.ausbildung-feature {
    padding: 20px;
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: 8px;
}
.ausbildung-feature-title {
    font-weight: 700; font-size: 0.85rem;
    margin-bottom: 4px; color: var(--secondary);
}
.ausbildung-feature-text {
    font-size: 0.8rem; color: var(--text-muted); line-height: 1.6;
}
.ausbildung-sidebar {
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 32px;
}
.ausbildung-sidebar h3 {
    font-family: var(--font-serif);
    font-size: 1.1rem; font-weight: 600;
    color: var(--secondary); margin-bottom: 20px;
}
.ausbildung-detail {
    display: flex; gap: 12px;
    padding: 14px 0;
    border-bottom: 1px solid var(--border);
}
.ausbildung-detail:last-child { border-bottom: none; }
.ausbildung-detail-icon {
    width: 32px; height: 32px; border-radius: 6px;
    background: var(--primary-light);
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
}
.ausbildung-detail-label {
    font-size: 0.78rem; color: var(--text-muted);
}
.ausbildung-detail-value {
    font-size: 0.88rem; font-weight: 600;
}
.ausbildung-methods {
    display: flex; flex-wrap: wrap; gap: 8px;
    margin-top: 24px;
}
.method-tag {
    padding: 6px 14px; border-radius: 100px;
    font-size: 0.75rem; font-weight: 600;
    background: var(--primary-light); color: var(--primary);
}

/* SERVICES */
.services-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.s-card {
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 32px 28px;
    transition: all 0.3s;
}
.s-card:hover {
    border-color: var(--primary);
    box-shadow: 0 8px 32px rgba(0,0,0,0.06);
    transform: translateY(-2px);
}
.s-card-header {
    display: flex; align-items: center; gap: 12px;
    margin-bottom: 16px;
}
.s-card-icon {
    width: 40px; height: 40px; border-radius: 6px;
    background: var(--primary-light);
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
}
.s-card h3 { font-size: 1.05rem; font-weight: 700; }
.s-card p { color: var(--text-muted); font-size: 0.88rem; line-height: 1.7; margin-bottom: 16px; }
.s-card-features {
    list-style: none; padding: 0;
    border-top: 1px solid var(--border); padding-top: 16px;
}
.s-card-features li {
    font-size: 0.82rem; color: var(--text-muted);
    padding: 4px 0; display: flex; align-items: center; gap: 8px;
}
.s-card-features li::before {
    content: '\2713'; color: var(--primary); font-weight: 700; font-size: 0.75rem;
}

/* PROCESS / FORMATE */
.process { background: var(--bg-white); }
.process-steps {
    display: grid; grid-template-columns: repeat(3, 1fr);
    gap: 24px; position: relative;
}
.process-step { text-align: center; position: relative; }
.process-step-num {
    width: 48px; height: 48px; border-radius: 50%;
    background: var(--primary); color: #fff;
    display: flex; align-items: center; justify-content: center;
    font-weight: 700; font-size: 0.9rem;
    margin: 0 auto 16px;
}
.process-step h4 { font-size: 0.92rem; font-weight: 700; margin-bottom: 8px; }
.process-step p { font-size: 0.82rem; color: var(--text-muted); line-height: 1.6; }

/* TESTIMONIALS */
.t-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.t-card {
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 28px;
}
.t-card-rating { color: #F59E0B; font-size: 0.8rem; letter-spacing: 2px; margin-bottom: 12px; }
.t-card blockquote {
    font-size: 0.9rem; line-height: 1.75;
    margin-bottom: 20px; font-style: italic;
    color: var(--text);
}
.t-card-author { display: flex; align-items: center; gap: 10px; }
.t-card-avatar {
    width: 36px; height: 36px; border-radius: 50%;
    background: var(--primary-light);
    display: flex; align-items: center; justify-content: center;
    font-size: 0.7rem; font-weight: 700; color: var(--primary);
}
.t-card-name { font-weight: 700; font-size: 0.85rem; }
.t-card-role { font-size: 0.75rem; color: var(--text-muted); }

/* ARTICLES (hidden until populated) */
.articles { background: var(--bg-white); display: none; }
.articles.has-articles { display: block; }
.articles-grid {
    display: grid; grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.article-card {
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
    transition: all 0.3s;
}
.article-card:hover {
    border-color: var(--primary);
    box-shadow: 0 8px 32px rgba(0,0,0,0.06);
    transform: translateY(-2px);
}
.article-card-img {
    aspect-ratio: 16/9;
    background: var(--gray-100);
    display: flex; align-items: center; justify-content: center;
}
.article-card-img img {
    width: 100%; height: 100%; object-fit: cover;
}
.article-card-body { padding: 24px; }
.article-card-meta {
    font-size: 0.75rem; color: var(--text-muted);
    margin-bottom: 8px; display: flex; gap: 12px;
}
.article-card-tag {
    background: var(--primary-light); color: var(--primary);
    padding: 2px 8px; border-radius: 4px; font-weight: 600;
}
.article-card h3 {
    font-size: 1rem; font-weight: 700;
    margin-bottom: 8px; color: var(--secondary);
}
.article-card h3 a {
    color: inherit; text-decoration: none;
}
.article-card h3 a:hover { color: var(--primary); }
.article-card p {
    font-size: 0.85rem; color: var(--text-muted);
    line-height: 1.7;
}

/* CTA / CONTACT */
.cta {
    background: var(--secondary);
    color: #fff;
}
.cta .section-title { color: #fff; }
.cta .section-label { color: rgba(255,255,255,0.5); }
.cta-intro { color: rgba(255,255,255,0.7); max-width: 500px; font-size: 1rem; margin-bottom: 8px; }

/* CONTACT FORM */
.contact-form {
    max-width: 600px; margin: 0 auto;
    display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
}
.contact-form .form-group { display: flex; flex-direction: column; gap: 6px; }
.contact-form .form-group.full-width { grid-column: 1 / -1; }
.contact-form label {
    font-size: 0.78rem; font-weight: 600;
    text-transform: uppercase; letter-spacing: 0.05em;
    color: rgba(255,255,255,0.6);
}
.contact-form input,
.contact-form textarea {
    font-family: var(--font-sans);
    font-size: 0.9rem;
    padding: 12px 16px;
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: 6px;
    background: rgba(255,255,255,0.08);
    color: #fff;
    transition: border-color 0.3s, background 0.3s;
}
.contact-form input::placeholder,
.contact-form textarea::placeholder {
    color: rgba(255,255,255,0.3);
}
.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--primary);
    background: rgba(255,255,255,0.12);
}
.contact-form textarea { resize: vertical; min-height: 120px; }
.contact-form .privacy-group {
    grid-column: 1 / -1;
    display: flex; align-items: flex-start; gap: 10px;
}
.contact-form .privacy-group input[type="checkbox"] {
    width: 16px; height: 16px; margin-top: 2px;
    accent-color: var(--primary); flex-shrink: 0;
}
.contact-form .privacy-group label {
    text-transform: none; letter-spacing: 0;
    font-weight: 400; font-size: 0.82rem;
    color: rgba(255,255,255,0.5); cursor: pointer;
}
.contact-form .privacy-group a {
    color: rgba(255,255,255,0.7);
    text-decoration: underline;
}
.contact-form .privacy-group a:hover { color: #fff; }
.form-actions {
    grid-column: 1 / -1;
    display: flex; align-items: center; gap: 16px;
    margin-top: 8px;
}
.form-actions .btn-submit {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 14px 32px; border-radius: 6px;
    font-size: 0.88rem; font-weight: 600;
    font-family: var(--font-sans);
    background: #fff; color: var(--primary);
    border: none; cursor: pointer;
    transition: all 0.3s;
}
.form-actions .btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.2);
}
.form-actions .btn-submit:disabled {
    opacity: 0.6; cursor: not-allowed;
    transform: none; box-shadow: none;
}
.form-status {
    font-size: 0.85rem; color: rgba(255,255,255,0.7);
    opacity: 0; transition: opacity 0.3s;
}
.form-status.visible { opacity: 1; }
.form-status.success { color: #4ADE80; }
.form-status.error { color: #F87171; }

/* FOOTER */
footer {
    background: var(--bg-white);
    padding: 32px 0;
    border-top: 1px solid var(--border);
}
footer .wrap {
    display: flex; justify-content: space-between;
    align-items: center; flex-wrap: wrap; gap: 16px;
}
.footer-copy { font-size: 0.82rem; color: var(--text-muted); }
.footer-links { display: flex; gap: 20px; list-style: none; }
.footer-links a {
    font-size: 0.82rem; color: var(--text-muted);
    text-decoration: none; transition: 0.3s;
}
.footer-links a:hover { color: var(--primary); }

/* REVEAL ANIMATION */
.reveal {
    opacity: 0; transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }

/* RESPONSIVE */
@media (max-width: 968px) {
    .hero .wrap { grid-template-columns: 1fr; gap: 40px; }
    .hero-img { max-width: 500px; }
    .about .wrap { grid-template-columns: 1fr; gap: 40px; }
    .about-photo { max-width: 320px; }
    .services-grid, .t-grid, .articles-grid { grid-template-columns: 1fr 1fr; }
    .credentials .wrap { grid-template-columns: repeat(2, 1fr); }
    .process-steps { grid-template-columns: repeat(2, 1fr); }
    .ausbildung-grid { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
    .contact-form { grid-template-columns: 1fr; }
    .nav-links { display: none; }
    .nav-links.open {
        display: flex; flex-direction: column;
        position: absolute; top: 64px; left: 0; right: 0;
        background: rgba(255,255,255,0.98);
        padding: 20px; gap: 16px;
        border-bottom: 1px solid var(--border);
    }
    .nav-toggle { display: block; }
    .services-grid, .t-grid, .articles-grid { grid-template-columns: 1fr; }
    .credentials .wrap { grid-template-columns: 1fr; gap: 16px; }
    .process-steps { grid-template-columns: 1fr 1fr; gap: 20px; }
    .ausbildung-features { grid-template-columns: 1fr; }
    footer .wrap { flex-direction: column; text-align: center; }
}