/* ============================================================
   bit2ai Theme — main.css
   Mobile-first responsive stylesheet
   ============================================================ */

/* ============================================================
   SITE HEADER
   ============================================================ */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: rgba(11, 18, 32, 0.96);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(56, 189, 248, 0.08);
    transition: box-shadow 0.2s ease;
}

.site-header.scrolled {
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.30);
}

.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
}

/* Logo */
.site-logo {
    font-family: var(--font-mono);
    font-size: 1.375rem;
    font-weight: 400;
    letter-spacing: -0.02em;
    line-height: 1;
    flex-shrink: 0;
}

.logo-bit  { color: var(--color-white); }
.logo-2    { color: var(--color-blue);  font-weight: 300; }
.logo-ai   { color: var(--color-blue);  }

/* Nav */
.site-nav {
    display: none;
    align-items: center;
    gap: 2rem;
}

.site-nav__list {
    display: flex;
    align-items: center;
    gap: 1.75rem;
}

.site-nav__list li a {
    font-size: 0.9375rem;
    font-weight: 500;
    color: rgba(248, 250, 252, 0.8);
    transition: color 0.15s ease;
}

.site-nav__list li a:hover,
.site-nav__list li a:focus,
.site-nav__list li.current-menu-item > a {
    color: var(--color-white);
}

.site-nav__cta {
    padding: 10px 20px;
    font-size: 0.875rem;
}

/* Hamburger */
.hamburger {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    padding: 4px;
    border-radius: 4px;
    transition: background-color 0.15s ease;
}

.hamburger:hover { background-color: rgba(255,255,255,0.08); }

.hamburger__bar {
    display: block;
    width: 22px;
    height: 2px;
    background-color: var(--color-white);
    border-radius: 2px;
    transition: transform 0.25s ease, opacity 0.25s ease;
    transform-origin: center;
}

/* Hamburger open state */
.hamburger.is-open .hamburger__bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}
.hamburger.is-open .hamburger__bar:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}
.hamburger.is-open .hamburger__bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* Mobile nav open state */
.site-nav.is-open {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    position: fixed;
    inset: 68px 0 0 0;
    background-color: var(--color-navy);
    padding: 2rem 24px;
    gap: 1rem;
    overflow-y: auto;
}

.site-nav.is-open .site-nav__list {
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    width: 100%;
}

.site-nav.is-open .site-nav__list li {
    width: 100%;
    border-bottom: 1px solid rgba(255,255,255,0.06);
}

.site-nav.is-open .site-nav__list li a {
    display: block;
    padding: 1rem 0;
    font-size: 1.125rem;
}

.site-nav.is-open .site-nav__cta {
    margin-top: 1rem;
    align-self: flex-start;
}

/* ============================================================
   SITE FOOTER
   ============================================================ */
.site-footer {
    background-color: var(--color-navy);
    border-top: 1px solid rgba(56, 189, 248, 0.08);
}

.site-footer__main {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2.5rem;
    padding-block: 60px;
}

.site-footer__brand .site-logo {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
}

.site-footer__claim {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    color: var(--color-cyan);
    margin-bottom: 0.25rem;
}

.site-footer__tagline {
    font-size: 0.875rem;
    color: rgba(248, 250, 252, 0.5);
}

.site-footer__nav-list {
    display: flex;
    flex-direction: column;
    gap: 0.625rem;
}

.site-footer__nav-list li a {
    font-size: 0.9375rem;
    color: rgba(248, 250, 252, 0.7);
    transition: color 0.15s ease;
}

.site-footer__nav-list li a:hover { color: var(--color-white); }

.site-footer__contact-label {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-cyan);
    margin-bottom: 0.5rem;
}

.site-footer__email {
    font-size: 1rem;
    color: var(--color-white);
    transition: color 0.15s ease;
}
.site-footer__email:hover { color: var(--color-cyan); }

.site-footer__bottom {
    border-top: 1px solid rgba(255,255,255,0.06);
    padding-block: 20px;
}

.site-footer__bottom p {
    font-size: 0.8125rem;
    color: rgba(248, 250, 252, 0.4);
    line-height: 1.5;
}

.site-footer__bottom a {
    color: rgba(248, 250, 252, 0.6);
    transition: color 0.15s ease;
}
.site-footer__bottom a:hover { color: var(--color-white); }

/* ============================================================
   HERO — HOMEPAGE
   ============================================================ */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    padding-block: 80px;
}

.hero__inner {
    width: 100%;
}

.hero__content {
    max-width: 720px;
    margin-inline: auto;
    text-align: center;
}

.hero__headline {
    margin-bottom: 1.25rem;
    color: var(--color-white);
}

.hero__headline span {
    color: var(--color-cyan);
}

.hero__subtext {
    font-size: 1.0625rem;
    color: rgba(248, 250, 252, 0.75);
    max-width: 560px;
    margin-inline: auto;
    margin-bottom: 2.5rem;
}

.hero__actions {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.hero__scroll-indicator {
    position: absolute;
    bottom: 2.5rem;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(56, 189, 248, 0.5);
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50%       { transform: translateX(-50%) translateY(8px); }
}

/* ============================================================
   PAGE HERO (inner pages)
   ============================================================ */
.page-hero {
    display: flex;
    align-items: center;
    padding-block: var(--section-pad-mobile);
}

.page-hero--small  { min-height: 40vh; }
.page-hero--medium { min-height: 50vh; }

.page-hero h1 {
    color: var(--color-white);
    margin-bottom: 0.75rem;
}

.page-hero__sub {
    font-family: var(--font-mono);
    font-size: 1rem;
    color: rgba(248, 250, 252, 0.6);
    margin-top: 0.5rem;
}

/* ============================================================
   SERVICES GRID (homepage)
   ============================================================ */
.services-section .section-header {
    margin-bottom: 3rem;
}

.services-section .section-header h2 {
    color: var(--color-gray-900);
}

.services-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.service-card {
    background-color: var(--color-white);
    border: 1px solid #E5E7EB;
    border-radius: var(--radius-card);
    padding: 2rem;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.service-card:hover {
    border-color: var(--color-blue);
    box-shadow: var(--shadow-card);
    transform: translateY(-3px);
}

.service-card__icon {
    margin-bottom: 1rem;
}

.service-card__icon-symbol {
    font-family: var(--font-mono);
    font-size: 1.75rem;
    color: var(--color-cyan);
    line-height: 1;
}

.service-card h3 {
    font-size: 1.125rem;
    color: var(--color-gray-900);
    margin-bottom: 0.5rem;
}

.service-card p {
    font-size: 0.9375rem;
    color: var(--color-gray-600);
    line-height: 1.6;
}

/* ============================================================
   ABOUT TEASER (homepage)
   ============================================================ */
.about-teaser__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
    align-items: center;
}

.about-teaser__text h2 {
    margin-block: 0.5rem 1.25rem;
}

.about-teaser__text p {
    color: rgba(248, 250, 252, 0.75);
    margin-bottom: 1rem;
}

.about-teaser__wordmark {
    font-family: var(--font-mono);
    font-size: clamp(3rem, 12vw, 7rem);
    font-weight: 300;
    line-height: 1;
    text-align: center;
    opacity: 0.15;
    pointer-events: none;
    user-select: none;
}

.wordmark-bit { color: var(--color-white); }
.wordmark-2   { color: var(--color-blue);  }
.wordmark-ai  { color: var(--color-blue);  }

/* ============================================================
   CTA BANNER
   ============================================================ */
.cta-banner h2 {
    margin-bottom: 1rem;
}

.cta-banner__text {
    color: rgba(248, 250, 252, 0.8);
    max-width: 540px;
    margin-inline: auto;
    margin-bottom: 2rem;
}

/* ============================================================
   SERVICE DETAIL (Leistungen page)
   ============================================================ */
.service-detail__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
    align-items: start;
}

.service-detail__icon-col {
    text-align: center;
}

.service-detail__big-icon {
    font-family: var(--font-mono);
    font-size: clamp(4rem, 15vw, 8rem);
    color: var(--color-cyan);
    line-height: 1;
    display: block;
    opacity: 0.6;
}

.section--dark-dot .service-detail__big-icon { opacity: 0.4; }

.service-detail__content h2 {
    margin-block: 0.5rem 1.25rem;
}

.service-detail__content p {
    margin-bottom: 1rem;
}

.section--light .service-detail__content p {
    color: var(--color-gray-600);
}

.section--dark-dot .service-detail__content p {
    color: rgba(248, 250, 252, 0.75);
}

.service-detail__bullets {
    margin-block: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.service-detail__bullets li {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    font-size: 0.9375rem;
    color: var(--color-gray-600);
}

.service-detail__bullets--light li {
    color: rgba(248, 250, 252, 0.8);
}

.bullet-icon {
    color: var(--color-blue);
    font-size: 1rem;
    flex-shrink: 0;
    margin-top: 1px;
}

/* ============================================================
   ABOUT PAGE
   ============================================================ */
.about-person__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2.5rem;
    align-items: start;
}

.about-person__avatar {
    display: flex;
    justify-content: center;
}

.about-person__avatar-placeholder {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-deep), var(--color-blue));
    display: flex;
    align-items: center;
    justify-content: center;
}

.about-person__avatar-placeholder span {
    font-family: var(--font-mono);
    font-size: 2rem;
    font-weight: 300;
    color: var(--color-white);
}

.about-person__content h2 {
    color: var(--color-gray-900);
    margin-bottom: 0.25rem;
}

.about-person__title {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--color-blue);
    margin-bottom: 1.25rem;
    display: block;
}

.about-person__content p {
    color: var(--color-gray-600);
    margin-bottom: 0.875rem;
}

.about-philosophy__inner {
    max-width: 720px;
    margin-inline: auto;
}

.about-philosophy__inner h2 {
    margin-block: 0.5rem 1.5rem;
}

.about-philosophy__content p {
    color: rgba(248, 250, 252, 0.75);
    margin-bottom: 1rem;
}

.values-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.value-card {
    background-color: var(--color-white);
    border: 1px solid #E5E7EB;
    border-radius: var(--radius-card);
    padding: 2rem;
}

.value-card__number {
    font-family: var(--font-mono);
    font-size: 2.5rem;
    font-weight: 300;
    color: var(--color-blue);
    opacity: 0.3;
    line-height: 1;
    margin-bottom: 0.75rem;
}

.value-card h3 {
    font-size: 1.125rem;
    color: var(--color-gray-900);
    margin-bottom: 0.625rem;
}

.value-card p {
    font-size: 0.9375rem;
    color: var(--color-gray-600);
}

/* ============================================================
   CONTACT PAGE
   ============================================================ */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
}

.contact-info h2 {
    color: var(--color-gray-900);
    margin-bottom: 0.875rem;
}

.contact-info > p {
    color: var(--color-gray-600);
    margin-bottom: 2rem;
}

.contact-info__item {
    margin-bottom: 1.25rem;
}

.contact-info__label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-blue);
    margin-bottom: 0.25rem;
}

.contact-info__value {
    font-size: 1rem;
    color: var(--color-gray-900);
}

a.contact-info__value:hover { color: var(--color-blue); }

/* Form */
.form-message {
    padding: 1rem 1.25rem;
    border-radius: var(--radius-card);
    margin-bottom: 1.5rem;
    font-size: 0.9375rem;
}

.form-message--success {
    background-color: #D1FAE5;
    color: #065F46;
    border: 1px solid #6EE7B7;
}

.form-message--error {
    background-color: #FEE2E2;
    color: #991B1B;
    border: 1px solid #FCA5A5;
}

.contact-form__honeypot {
    position: absolute;
    left: -9999px;
    opacity: 0;
    pointer-events: none;
}

.form-row--split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-gray-900);
    margin-bottom: 0.375rem;
}

.required { color: var(--color-blue); }

.form-input {
    display: block;
    width: 100%;
    padding: 12px 14px;
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    color: var(--color-gray-900);
    background-color: var(--color-white);
    border: 1.5px solid #D1D5DB;
    border-radius: 6px;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
    outline: none;
    appearance: none;
    -webkit-appearance: none;
}

.form-input:hover { border-color: #9CA3AF; }

.form-input:focus {
    border-color: var(--color-blue);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.12);
}

.form-textarea {
    resize: vertical;
    min-height: 140px;
}

.form-privacy-note {
    font-size: 0.8125rem;
    color: var(--color-gray-600);
}

.form-privacy-note a {
    color: var(--color-blue);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.btn--full { width: 100%; text-align: center; }

/* ============================================================
   LEGAL PAGES
   ============================================================ */
.legal-page__content {
    max-width: 760px;
}

.legal-page__content h2 {
    font-size: 1.375rem;
    color: var(--color-gray-900);
    margin-block: 2rem 0.75rem;
    padding-top: 1rem;
    border-top: 1px solid #E5E7EB;
}

.legal-page__content h2:first-child {
    border-top: none;
    margin-top: 0;
    padding-top: 0;
}

.legal-page__content h3 {
    font-size: 1.0625rem;
    color: var(--color-gray-900);
    margin-block: 1.5rem 0.5rem;
}

.legal-page__content p {
    color: var(--color-gray-600);
    margin-bottom: 1rem;
    line-height: 1.7;
}

.legal-page__content a {
    color: var(--color-blue);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.legal-page__notice {
    background-color: #FEF3C7;
    color: #92400E;
    border: 1px solid #FDE68A;
    border-radius: var(--radius-card);
    padding: 1rem 1.25rem;
    font-size: 0.9375rem;
    margin-bottom: 2rem;
}

/* ============================================================
   SECTION HEADER UTILITY
   ============================================================ */
.section-header {
    margin-bottom: 3rem;
}

.section-header h2 { margin-top: 0.5rem; }

/* ============================================================
   TABLET — 768px+
   ============================================================ */
@media (min-width: 768px) {

    .site-footer__main {
        grid-template-columns: 1.5fr 1fr 1fr;
    }

    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .hero__actions {
        flex-direction: row;
        justify-content: center;
    }

    .page-hero {
        padding-block: 80px;
    }

    .about-person__grid {
        grid-template-columns: 180px 1fr;
    }

    .about-person__avatar {
        justify-content: flex-start;
    }

    .values-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .contact-grid {
        grid-template-columns: 1fr 1.4fr;
    }

}

/* ============================================================
   DESKTOP — 1024px+
   ============================================================ */
@media (min-width: 1024px) {

    /* Show nav, hide hamburger */
    .site-nav {
        display: flex;
    }

    .hamburger {
        display: none;
    }

    /* Section padding */
    .section {
        padding-block: var(--section-pad-desktop);
    }

    .page-hero {
        padding-block: var(--section-pad-desktop);
    }

    .services-grid {
        grid-template-columns: repeat(4, 1fr);
    }

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

    .about-teaser__wordmark {
        text-align: right;
    }

    .service-detail__grid {
        grid-template-columns: 1fr 2fr;
        gap: 4rem;
    }

    .service-detail__grid--reverse {
        grid-template-columns: 2fr 1fr;
    }

    .service-detail__grid--reverse .service-detail__content {
        order: -1;
    }

    .site-footer__main {
        padding-block: 80px;
    }

}

/* ============================================================
   SMOOTH SCROLL
   ============================================================ */
html {
    scroll-behavior: smooth;
}

/* ============================================================
   SCROLLBAR STYLING
   ============================================================ */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--color-navy); }
::-webkit-scrollbar-thumb {
    background: rgba(56, 189, 248, 0.2);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(56, 189, 248, 0.4);
}

/* ============================================================
   SELECTION
   ============================================================ */
::selection {
    background-color: rgba(59, 130, 246, 0.3);
    color: var(--color-white);
}