/* =============================================
   SCIGNS - Science-Led Holding Company
   Design: Dark corporate, Novo Holdings hero video style,
           Arising Ventures footer, Instrument Serif + Satoshi fonts
   ============================================= */

/* --- Design Tokens --- */
:root {
    /* Typography */
    --font-display: 'Instrument Serif', Georgia, serif;
    --font-body: 'Satoshi', 'Helvetica Neue', Arial, sans-serif;

    /* Type Scale (fluid) */
    --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
    --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
    --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
    --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
    --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
    --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);
    --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);
    --text-hero: clamp(3rem,     0.5rem  + 7vw,    8rem);

    /* Spacing (4px base) */
    --space-1:  0.25rem;
    --space-2:  0.5rem;
    --space-3:  0.75rem;
    --space-4:  1rem;
    --space-5:  1.25rem;
    --space-6:  1.5rem;
    --space-8:  2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    --space-32: 8rem;

    /* Colors - Dark corporate palette (navy/white) */
    --color-bg: #ffffff;
    --color-surface: #f8f8f6;
    --color-text: #1a1a1a;
    --color-text-muted: #6b6b6b;
    --color-text-faint: #999999;
    --color-border: #e0e0e0;
    --color-divider: #ebebeb;

    /* Footer (deep navy like Arising Ventures) */
    --color-footer-bg: #0b2e4c;
    --color-footer-text: #f8f8f6;
    --color-footer-muted: #8ba3b9;

    /* Accent */
    --color-accent: #0b2e4c;
    --color-accent-light: #1a4a6e;

    /* Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1.125rem;
    --radius-2xl: 1.5rem;

    /* Transitions */
    --transition-fast: 180ms cubic-bezier(0.16, 1, 0.3, 1);
    --transition-smooth: 400ms cubic-bezier(0.16, 1, 0.3, 1);

    /* Content widths */
    --content-narrow: 640px;
    --content-default: 960px;
    --content-wide: 1200px;
}

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

html {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    scroll-behavior: smooth;
    scroll-padding-top: var(--space-16);
    -webkit-text-size-adjust: 100%;
    -moz-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

body {
    min-height: 100vh;
    min-height: 100dvh;
    line-height: 1.6;
    font-family: var(--font-body);
    font-size: var(--text-base);
    color: var(--color-text);
    background-color: var(--color-bg);
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
}

img, picture, video, canvas, svg { display: block; max-width: 100%; height: auto; }
ul[role="list"], ol[role="list"] { list-style: none; }
input, button, textarea, select { font: inherit; color: inherit; }
h1, h2, h3, h4, h5, h6 { text-wrap: balance; line-height: 1.15; }
p, li, figcaption { text-wrap: pretty; max-width: 72ch; }
button { cursor: pointer; background: none; border: none; -webkit-tap-highlight-color: transparent; }
a { -webkit-tap-highlight-color: transparent; }

a, button, [role="button"], input, textarea, select {
    transition: color var(--transition-fast),
                background var(--transition-fast),
                border-color var(--transition-fast),
                box-shadow var(--transition-fast);
}

::selection {
    background: rgba(11, 46, 76, 0.15);
    color: var(--color-text);
}

:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 3px;
    border-radius: var(--radius-sm);
}

.sr-only {
    position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
    overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border-width: 0;
}

.container {
    max-width: var(--content-wide);
    margin: 0 auto;
    padding-inline: clamp(var(--space-5), 5vw, var(--space-12));
}

/* =============================================
   HERO SECTION
   ============================================= */
.hero {
    position: relative;
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    overflow: hidden;
    background: #000;
}

.hero__video-wrap {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero__video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero__overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        180deg,
        rgba(0, 0, 0, 0.55) 0%,
        rgba(0, 0, 0, 0.3) 40%,
        rgba(0, 0, 0, 0.5) 100%
    );
}

.hero__content {
    position: relative;
    z-index: 2;
    padding-top: var(--space-32);
    padding-bottom: var(--space-16);
    max-width: 800px;
}

.hero__title {
    font-family: var(--font-display);
    font-size: var(--text-hero);
    font-weight: 400;
    color: #ffffff;
    line-height: 1.05;
    margin-bottom: var(--space-6);
    letter-spacing: -0.02em;
}

.hero__subtitle {
    font-family: var(--font-body);
    font-size: var(--text-lg);
    font-weight: 300;
    color: rgba(255, 255, 255, 0.75);
    max-width: 580px;
    line-height: 1.5;
}

.hero__subtitle--second {
    margin-top: var(--space-4);
}

/* Scroll indicator */
.hero__scroll-indicator {
    position: absolute;
    bottom: var(--space-10);
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    color: rgba(255, 255, 255, 0.5);
    font-size: var(--text-xs);
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.hero__scroll-line {
    width: 1px;
    height: 40px;
    background: rgba(255, 255, 255, 0.3);
    position: relative;
    overflow: hidden;
}

.hero__scroll-line::after {
    content: '';
    position: absolute;
    top: -100%;
    left: 0;
    width: 100%;
    height: 100%;
    background: #fff;
    animation: scrollLine 2s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

@keyframes scrollLine {
    0% { top: -100%; }
    100% { top: 100%; }
}

/* =============================================
   HEADER / NAVIGATION
   ============================================= */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 200;
    padding: var(--space-5) 0;
    transition: background var(--transition-smooth), box-shadow var(--transition-smooth);
}

/* iOS safe area support */
@supports (padding-top: env(safe-area-inset-top)) {
    .header {
        padding-top: calc(var(--space-5) + env(safe-area-inset-top));
    }
}

.header--scrolled {
    background: rgba(255, 255, 255, 0.97);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.06);
}

.header--scrolled .header__logo-img {
    filter: none;
}

.header--scrolled .header__nav-list a {
    color: var(--color-text);
}

.header--scrolled .header__nav-list a:hover {
    color: var(--color-accent);
}

.header--scrolled .header__nav-list a::after {
    background: var(--color-accent);
}

.header--scrolled .header__menu-btn span {
    background: var(--color-text) !important;
}

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

.header__logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    /* Minimum touch target */
    min-height: 44px;
}

.header__logo-img {
    height: 28px;
    width: auto;
    filter: brightness(0) invert(1);
}

.header__nav-list {
    display: flex;
    gap: var(--space-8);
    list-style: none;
}

.header__nav-list a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    font-size: var(--text-sm);
    font-weight: 500;
    letter-spacing: 0.02em;
    position: relative;
    /* Minimum touch target */
    padding: var(--space-2) 0;
}

.header__nav-list a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background: #fff;
    transition: width var(--transition-fast);
}

.header__nav-list a:hover {
    color: #ffffff;
}

.header__nav-list a:hover::after {
    width: 100%;
}

/* Mobile menu button */
.header__menu-btn {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 6px;
    /* 44x44 minimum touch target for mobile */
    width: 44px;
    height: 44px;
    padding: 0;
    position: relative;
    z-index: 201;
    touch-action: manipulation;
}

.header__menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: #fff;
    border-radius: 1px;
    transition: transform var(--transition-fast), opacity var(--transition-fast);
    pointer-events: none;
}

/* Hamburger X animation (active state) */
.header__menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}
.header__menu-btn.active span:nth-child(2) {
    opacity: 0;
}
.header__menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* When menu is open, always white lines for X and white logo */
.header__menu-btn.active span {
    background: #fff !important;
}

/* =============================================
   MOBILE NAVIGATION OVERLAY
   Lives OUTSIDE the header to avoid stacking context issues.
   The header's position:fixed + z-index creates a stacking context
   that traps child elements on iOS Safari and other browsers.
   ============================================= */
.mobile-nav {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.98);
    z-index: 150;
    align-items: center;
    justify-content: center;
    flex-direction: column;
}

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

.mobile-nav__list {
    list-style: none;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-10);
    padding: 0;
    margin: 0;
}

.mobile-nav__list a {
    font-family: var(--font-body);
    font-size: var(--text-xl);
    color: #fff;
    text-decoration: none;
    font-weight: 500;
    letter-spacing: 0.02em;
    padding: var(--space-2) var(--space-4);
    -webkit-tap-highlight-color: transparent;
}

.mobile-nav__list a:hover {
    opacity: 0.8;
}

/* When menu is open, make header blend with dark overlay */
.header--menu-open {
    background: transparent !important;
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
    box-shadow: none !important;
}

.header--menu-open .header__logo-img {
    filter: brightness(0) invert(1) !important;
}

/* =============================================
   CONTENT SECTIONS
   ============================================= */
.section {
    padding-block: clamp(var(--space-16), 10vw, var(--space-32));
}

.section__header {
    margin-bottom: clamp(var(--space-8), 5vw, var(--space-16));
}

.section__label {
    display: block;
    font-size: var(--text-xs);
    font-weight: 500;
    color: var(--color-text-faint);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    margin-bottom: var(--space-4);
}

.section__title {
    font-family: var(--font-display);
    font-size: var(--text-2xl);
    font-weight: 400;
    color: var(--color-text);
    line-height: 1.1;
    letter-spacing: -0.01em;
}

/* --- Thesis --- */
.section--thesis {
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-divider);
}

.thesis__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: clamp(var(--space-8), 5vw, var(--space-16));
}

.thesis__intro {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: 400;
    line-height: 1.35;
    color: var(--color-text);
}

.thesis__intro strong {
    font-style: italic;
}

.thesis__body p {
    font-size: var(--text-base);
    color: var(--color-text-muted);
    margin-bottom: var(--space-6);
    line-height: 1.7;
}

/* --- Architecture --- */
.section--architecture {
    background: var(--color-surface);
}

.architecture__intro {
    font-size: var(--text-base);
    color: var(--color-text-muted);
    max-width: 740px;
    margin-bottom: clamp(var(--space-10), 5vw, var(--space-16));
    line-height: 1.7;
}

.subsidiaries {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-6);
}

.subsidiary-card {
    display: block;
    text-decoration: none;
    color: inherit;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: transform var(--transition-smooth),
                box-shadow var(--transition-smooth),
                border-color var(--transition-smooth);
}

.subsidiary-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.08);
    border-color: var(--color-accent);
}

.subsidiary-card__inner {
    padding: clamp(var(--space-8), 4vw, var(--space-12));
}

.subsidiary-card__name {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: 400;
    margin-bottom: var(--space-4);
    color: var(--color-text);
}

.subsidiary-card__desc {
    font-size: var(--text-base);
    color: var(--color-text-muted);
    line-height: 1.6;
    margin-bottom: var(--space-6);
}

.subsidiary-card__link {
    display: inline-block;
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-accent);
    letter-spacing: 0.02em;
}

.subsidiary-card:hover .subsidiary-card__link {
    color: var(--color-accent-light);
}

/* --- Built For --- */
.section--built-for {
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-divider);
}

.built-for__intro {
    font-size: var(--text-base);
    color: var(--color-text-muted);
    margin-bottom: clamp(var(--space-8), 4vw, var(--space-12));
    line-height: 1.7;
}

.built-for__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-8);
    margin-bottom: clamp(var(--space-8), 4vw, var(--space-12));
}

.built-for__item {
    padding: var(--space-8);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    transition: border-color var(--transition-fast);
}

.built-for__item:hover {
    border-color: var(--color-accent);
}

.built-for__item h3 {
    font-family: var(--font-display);
    font-size: var(--text-lg);
    font-weight: 400;
    margin-bottom: var(--space-3);
    color: var(--color-text);
}

.built-for__item p {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    line-height: 1.6;
}

.built-for__closing {
    font-family: var(--font-display);
    font-size: var(--text-lg);
    font-weight: 400;
    font-style: italic;
    color: var(--color-text);
    max-width: 680px;
    line-height: 1.5;
}

/* --- Partners --- */
.section--partners {
    background: var(--color-surface);
}

.partners__intro {
    font-size: var(--text-base);
    color: var(--color-text-muted);
    margin-bottom: clamp(var(--space-8), 4vw, var(--space-12));
    line-height: 1.7;
}

.partners__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-6);
}

.partners__item {
    padding: var(--space-8);
    border-left: 2px solid var(--color-accent);
}

.partners__item h3 {
    font-family: var(--font-display);
    font-size: var(--text-lg);
    font-weight: 400;
    margin-bottom: var(--space-3);
    color: var(--color-text);
}

.partners__item p {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* --- Domains --- */
.section--domains {
    background: var(--color-bg);
}

.domains__intro {
    font-size: var(--text-base);
    color: var(--color-text-muted);
    margin-bottom: clamp(var(--space-8), 4vw, var(--space-12));
    line-height: 1.7;
}

.domains__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
    margin-bottom: clamp(var(--space-8), 4vw, var(--space-12));
}

.domain-card {
    padding: clamp(var(--space-6), 3vw, var(--space-10));
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    transition: transform var(--transition-smooth),
                box-shadow var(--transition-smooth);
}

.domain-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.06);
}

.domain-card__icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent);
    margin-bottom: var(--space-5);
}

.domain-card h3 {
    font-family: var(--font-display);
    font-size: var(--text-lg);
    font-weight: 400;
    margin-bottom: var(--space-3);
    color: var(--color-text);
}

.domain-card p {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    line-height: 1.6;
}

.domains__closing {
    font-family: var(--font-display);
    font-size: var(--text-lg);
    font-weight: 400;
    font-style: italic;
    color: var(--color-text);
    max-width: 680px;
    line-height: 1.5;
}

/* =============================================
   FOOTER 
   ============================================= */
.footer {
    padding: var(--space-4);
}

.footer__inner {
    background: var(--color-footer-bg);
    border-radius: var(--radius-2xl);
    overflow: hidden;
    padding: clamp(var(--space-10), 6vw, var(--space-20));
}

.footer__content {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: clamp(var(--space-8), 5vw, var(--space-16));
    margin-bottom: clamp(var(--space-12), 6vw, var(--space-24));
}

.footer__heading {
    font-family: var(--font-display);
    font-size: var(--text-2xl);
    font-weight: 400;
    color: var(--color-footer-text);
    margin-bottom: var(--space-8);
    line-height: 1.1;
}

.footer__desc {
    font-size: var(--text-sm);
    color: var(--color-footer-muted);
    line-height: 1.7;
    margin-bottom: var(--space-8);
    max-width: 420px;
}

.footer__email-btn {
    display: inline-block;
    padding: var(--space-3) var(--space-5);
    border: 1px solid var(--color-footer-muted);
    border-radius: 9999px;
    color: var(--color-footer-text);
    text-decoration: none;
    font-size: var(--text-xs);
    font-weight: 500;
    letter-spacing: 0.02em;
    transition: background var(--transition-fast), border-color var(--transition-fast);
    /* Minimum touch target */
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.footer__email-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--color-footer-text);
}

/* Footer Form */
.footer__form {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.footer__form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
}

.footer__form input,
.footer__form textarea {
    width: 100%;
    padding: var(--space-4) var(--space-5);
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-md);
    color: var(--color-footer-text);
    font-size: var(--text-sm);
    /* Prevent iOS zoom on focus */
    font-size: max(16px, var(--text-sm));
    transition: border-color var(--transition-fast), background var(--transition-fast);
}

.footer__form input::placeholder,
.footer__form textarea::placeholder {
    color: var(--color-footer-muted);
}

.footer__form input:focus,
.footer__form textarea:focus {
    outline: none;
    border-color: rgba(255, 255, 255, 0.4);
    background: rgba(255, 255, 255, 0.1);
}

.footer__form textarea {
    resize: vertical;
    min-height: 100px;
}

.footer__submit {
    width: 100%;
    padding: var(--space-4) var(--space-8);
    background: var(--color-footer-text);
    color: var(--color-footer-bg);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    font-weight: 600;
    letter-spacing: 0.02em;
    cursor: pointer;
    transition: opacity var(--transition-fast);
    min-height: 44px;
}

.footer__submit:hover {
    opacity: 0.9;
}

/* Footer Wordmark */
.footer__wordmark {
    text-align: center;
    padding-top: var(--space-8);
}

.footer__wordmark span {
    font-family: var(--font-display);
    font-size: clamp(4rem, 1rem + 12vw, 12rem);
    font-weight: 400;
    line-height: 1;
    background: linear-gradient(
        90deg,
        #6b8cad 0%,
        #a07dad 35%,
        #c88a8a 65%,
        #d4a07a 100%
    );
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    opacity: 0.6;
    user-select: none;
}

/* Footer social icons */
.footer__social {
    display: flex;
    align-items: center;
    gap: var(--space-5);
    margin-top: var(--space-8);
}

.footer__social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    color: var(--color-footer-muted);
    text-decoration: none;
    transition: color var(--transition-fast), opacity var(--transition-fast);
}

.footer__social-link:hover {
    color: var(--color-footer-text);
}

.footer__social-link svg {
    display: block;
}

/* Footer bottom bar - legal links at the very bottom */
.footer__bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-top: var(--space-6);
    margin-top: 0;
}

.footer__legal {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-1);
    font-size: 0.7rem;
    letter-spacing: 0.03em;
    color: rgba(139, 163, 185, 0.5);
}

.footer__legal a {
    color: rgba(139, 163, 185, 0.5);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer__legal a:hover {
    color: var(--color-footer-muted);
}

.footer__copyright {
    color: rgba(139, 163, 185, 0.4);
}

.footer__legal-sep {
    display: inline-block;
    width: 3px;
    height: 3px;
    border-radius: 50%;
    background: rgba(139, 163, 185, 0.3);
    margin: 0 var(--space-2);
}

/* =============================================
   SCROLL ANIMATIONS
   ============================================= */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* Stagger children */
.stagger-children .reveal:nth-child(2) { transition-delay: 0.1s; }
.stagger-children .reveal:nth-child(3) { transition-delay: 0.2s; }
.stagger-children .reveal:nth-child(4) { transition-delay: 0.3s; }

/* --- Scigns Homepage Patches --- */

/* Role line on subsidiary cards */
.subsidiary-card__role {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    opacity: 0.55;
    margin-bottom: 1.2rem;
    font-weight: 500;
}

/* Footer dual-CTA wrapper */
.footer__cta-group {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 2rem;
}

/* Book-a-meeting CTA (inherits footer__email-btn base, adds distinction) */
.footer__book-btn {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: #fff;
}

.footer__book-btn:hover {
    border-color: rgba(255, 255, 255, 0.7);
}

/* =============================================
   RESPONSIVE - Tablet (960px)
   ============================================= */
@media (max-width: 960px) {
    .thesis__grid {
        grid-template-columns: 1fr;
    }

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

    .built-for__grid {
        grid-template-columns: 1fr;
    }

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

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

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

/* =============================================
   RESPONSIVE - Mobile (768px)
   ============================================= */
@media (max-width: 768px) {
    .header__nav {
        display: none;
    }

    .header__menu-btn {
        display: flex;
    }

    .hero__title {
        font-size: clamp(2.5rem, 0.5rem + 8vw, 5rem);
    }

    .footer__form-row {
        grid-template-columns: 1fr;
    }

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

    /* Disable hover transforms on touch devices */
    .subsidiary-card:hover {
        transform: none;
    }
    .domain-card:hover {
        transform: none;
    }
}

/* =============================================
   RESPONSIVE - Small Mobile (480px)
   ============================================= */
@media (max-width: 480px) {
    .hero__content {
        padding-top: var(--space-24);
        padding-bottom: var(--space-10);
    }

    .hero__subtitle {
        font-size: var(--text-base);
        max-width: 100%;
    }

    /* Tighter section padding on small screens */
    .section {
        padding-block: clamp(var(--space-10), 8vw, var(--space-20));
    }

    /* Card padding adjustments */
    .subsidiary-card__inner {
        padding: var(--space-6);
    }

    .built-for__item {
        padding: var(--space-6);
    }

    .partners__item {
        padding: var(--space-5);
        padding-left: var(--space-5);
    }

    /* Footer adjustments */
    .footer {
        padding: var(--space-2);
    }

    .footer__inner {
        border-radius: var(--radius-xl);
        padding: var(--space-8);
    }

    .footer__heading {
        font-size: var(--text-xl);
    }

    .footer__desc {
        max-width: 100%;
    }

    .footer__cta-group {
        flex-direction: column;
        gap: var(--space-3);
    }

    .footer__email-btn {
        width: 100%;
        text-align: center;
        padding: var(--space-3) var(--space-4);
    }

    .footer__wordmark span {
        font-size: clamp(2.5rem, 1rem + 10vw, 6rem);
    }

    .footer__legal {
        justify-content: center;
        text-align: center;
    }
}

/* =============================================
   RESPONSIVE - iPhone SE / Very Small (375px and below)
   ============================================= */
@media (max-width: 400px) {
    .container {
        padding-inline: var(--space-4);
    }

    .hero__title {
        font-size: clamp(2rem, 1rem + 6vw, 3.5rem);
    }

    .hero__content {
        padding-top: var(--space-20);
    }

    .hero__scroll-indicator {
        bottom: var(--space-6);
    }

    .section__title {
        font-size: clamp(1.5rem, 1rem + 2vw, 2.5rem);
    }

    .thesis__intro {
        font-size: var(--text-lg);
    }

    .subsidiary-card__name {
        font-size: var(--text-lg);
    }

    .subsidiary-card__desc {
        font-size: var(--text-sm);
    }

    .subsidiary-card__inner {
        padding: var(--space-5);
    }

    .domain-card {
        padding: var(--space-5);
    }

    .built-for__item {
        padding: var(--space-5);
    }

    .partners__item {
        padding: var(--space-4);
        padding-left: var(--space-4);
    }

    .footer__inner {
        padding: var(--space-6);
    }

    .footer__wordmark span {
        font-size: clamp(2rem, 0.5rem + 10vw, 4rem);
    }

    /* Ensure readable line height on small screens */
    .hero__subtitle,
    .thesis__body p,
    .architecture__intro,
    .subsidiary-card__desc,
    .built-for__item p,
    .domain-card p,
    .partners__item p,
    .domains__intro,
    .partners__intro,
    .built-for__intro,
    .footer__desc {
        line-height: 1.65;
    }
}

/* =============================================
   iOS SAFARI SPECIFIC FIXES
   ============================================= */

/* Fix for iOS Safari 100vh including address bar */
@supports (-webkit-touch-callout: none) {
    .hero {
        min-height: -webkit-fill-available;
    }
}

/* Ensure safe area padding on notched devices */
@supports (padding-bottom: env(safe-area-inset-bottom)) {
    .footer__inner {
        padding-bottom: calc(var(--space-10) + env(safe-area-inset-bottom));
    }
}

/* =============================================
   REDUCED MOTION
   ============================================= */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    .reveal {
        opacity: 1;
        transform: none;
    }
}