/*
Theme Name: Hydren
Theme URI: https://hydren.life/
Description: Decentralized AI-synchronized biological operating system for controlled environment agriculture.
Author: Hydren Life
Version: 1.0.0
Text Domain: hydron
*/

/* ===========================
   CSS Custom Properties
   =========================== */

:root {
    /* Backgrounds */
    --hydron-bg: #0a1018;
    --hydron-bg-elevated: #0e1822;
    --hydron-bg-card: rgba(255, 255, 255, 0.05);
    --hydron-bg-glass: rgba(255, 255, 255, 0.08);
    --hydron-bg-glass-hover: rgba(255, 255, 255, 0.12);
    --hydron-bg-input: rgba(255, 255, 255, 0.06);

    /* Borders */
    --hydron-border: rgba(255, 255, 255, 0.1);
    --hydron-border-hover: rgba(255, 255, 255, 0.18);
    --hydron-border-glow: rgba(0, 155, 58, 0.2);
    --hydron-border-active: rgba(0, 155, 58, 0.4);

    /* Text */
    --hydron-text: #e8ecf1;
    --hydron-text-secondary: #7a8ba3;
    --hydron-text-muted: #4a5568;
    --hydron-text-inverse: #0a1018;

    /* Accents — exact Hydren logo colors */
    --hydron-accent: #009B3A;
    --hydron-accent-hover: #008A33;
    --hydron-accent-light: rgba(0, 155, 58, 0.12);
    --hydron-accent-blue: #8DC63F;
    --hydron-accent-blue-light: rgba(141, 198, 63, 0.12);
    --hydron-accent-warm: #ff6b35;
    --hydron-accent-purple: #a855f7;

    /* Shadows & Glows */
    --hydron-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --hydron-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
    --hydron-shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --hydron-shadow-xl: 0 16px 64px rgba(0, 0, 0, 0.6);
    --hydron-glow-green: 0 0 20px rgba(0, 155, 58, 0.15);
    --hydron-glow-green-strong: 0 0 40px rgba(0, 155, 58, 0.25);
    --hydron-glow-blue: 0 0 20px rgba(141, 198, 63, 0.15);

    /* Glass */
    --hydron-glass-blur: blur(20px);

    /* Typography */
    --hydron-font: 'Inter', system-ui, -apple-system, sans-serif;
    --hydron-font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
    --hydron-font-size-xs: 0.75rem;
    --hydron-font-size-sm: 0.875rem;
    --hydron-font-size-base: 1rem;
    --hydron-font-size-lg: 1.125rem;
    --hydron-font-size-xl: 1.25rem;
    --hydron-font-size-2xl: 1.5rem;
    --hydron-font-size-3xl: 2rem;
    --hydron-font-size-4xl: 2.5rem;
    --hydron-font-size-5xl: 3.5rem;
    --hydron-font-size-6xl: 4.5rem;

    /* Spacing */
    --hydron-space-xs: 0.25rem;
    --hydron-space-sm: 0.5rem;
    --hydron-space-md: 1rem;
    --hydron-space-lg: 1.5rem;
    --hydron-space-xl: 2rem;
    --hydron-space-2xl: 3rem;
    --hydron-space-3xl: 4rem;
    --hydron-space-4xl: 6rem;

    /* Layout */
    --hydron-max-width: 1200px;
    --hydron-max-width-sm: 800px;
    --hydron-max-width-lg: 1400px;
    --hydron-radius-sm: 6px;
    --hydron-radius: 10px;
    --hydron-radius-lg: 16px;
    --hydron-radius-xl: 24px;
    --hydron-radius-full: 9999px;

    /* Transitions */
    --hydron-transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --hydron-transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    --hydron-transition-fast: 0.15s ease;
}

/* ===========================
   Reset & Base
   =========================== */

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--hydron-font);
    font-size: var(--hydron-font-size-base);
    line-height: 1.6;
    color: var(--hydron-text);
    background: var(--hydron-bg);
    overflow-x: hidden;
}

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

a:hover {
    color: var(--hydron-accent-hover);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    color: var(--hydron-text);
    letter-spacing: -0.02em;
}

h1 { font-size: var(--hydron-font-size-5xl); }
h2 { font-size: var(--hydron-font-size-4xl); }
h3 { font-size: var(--hydron-font-size-2xl); }
h4 { font-size: var(--hydron-font-size-xl); }

p {
    color: var(--hydron-text-secondary);
    margin-bottom: var(--hydron-space-md);
}

/* ===========================
   Layout
   =========================== */

.container {
    width: 100%;
    max-width: var(--hydron-max-width);
    margin: 0 auto;
    padding: 0 var(--hydron-space-xl);
}

.container-sm {
    max-width: var(--hydron-max-width-sm);
}

.container-lg {
    max-width: var(--hydron-max-width-lg);
}

.section {
    padding: var(--hydron-space-4xl) 0;
}

.section-sm {
    padding: var(--hydron-space-2xl) 0;
}

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

.section-label {
    display: inline-block;
    font-family: var(--hydron-font-mono);
    font-size: var(--hydron-font-size-xs);
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--hydron-accent);
    background: rgba(0, 155, 58, 0.12);
    padding: 6px 14px;
    border-radius: var(--hydron-radius-full);
    border: 1px solid rgba(0, 155, 58, 0.25);
    margin-bottom: var(--hydron-space-lg);
}

.section-title {
    font-size: var(--hydron-font-size-4xl);
    margin-bottom: var(--hydron-space-md);
}

.section-subtitle {
    font-size: var(--hydron-font-size-lg);
    color: var(--hydron-text-secondary);
    max-width: 640px;
    margin: 0 auto var(--hydron-space-2xl);
}

/* ===========================
   Glass Components
   =========================== */

.glass {
    background: var(--hydron-bg-glass);
    backdrop-filter: var(--hydron-glass-blur);
    -webkit-backdrop-filter: var(--hydron-glass-blur);
    border: 1px solid var(--hydron-border);
    border-radius: var(--hydron-radius-lg);
}

.glass-card {
    background: var(--hydron-bg-card);
    backdrop-filter: var(--hydron-glass-blur);
    -webkit-backdrop-filter: var(--hydron-glass-blur);
    border: 1px solid var(--hydron-border);
    border-radius: var(--hydron-radius-lg);
    padding: var(--hydron-space-xl);
    transition: border-color var(--hydron-transition), box-shadow var(--hydron-transition), transform var(--hydron-transition);
}

.glass-card:hover {
    border-color: var(--hydron-border-glow);
    box-shadow: var(--hydron-glow-green);
    transform: translateY(-2px);
}

/* ===========================
   Buttons
   =========================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-family: var(--hydron-font);
    font-size: var(--hydron-font-size-sm);
    font-weight: 600;
    padding: 12px 28px;
    border-radius: var(--hydron-radius);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--hydron-transition);
    text-decoration: none;
    line-height: 1;
    white-space: nowrap;
}

.btn-primary {
    background: var(--hydron-accent);
    color: var(--hydron-text-inverse);
    border-color: var(--hydron-accent);
}

.btn-primary:hover {
    background: var(--hydron-accent-hover);
    color: var(--hydron-text-inverse);
    box-shadow: var(--hydron-glow-green);
    transform: translateY(-1px);
}

.btn-ghost {
    background: var(--hydron-bg-glass);
    color: var(--hydron-text);
    border-color: var(--hydron-border);
    backdrop-filter: var(--hydron-glass-blur);
}

.btn-ghost:hover {
    background: var(--hydron-bg-glass-hover);
    border-color: var(--hydron-border-hover);
    color: var(--hydron-text);
}

.btn-cta {
    background: var(--hydron-accent);
    color: var(--hydron-text-inverse);
    border-color: var(--hydron-accent);
    font-size: var(--hydron-font-size-base);
    padding: 14px 36px;
    border-radius: var(--hydron-radius);
    box-shadow: var(--hydron-glow-green);
    animation: ctaGlow 3s ease-in-out infinite;
}

.btn-cta:hover {
    background: var(--hydron-accent-hover);
    color: var(--hydron-text-inverse);
    box-shadow: var(--hydron-glow-green-strong);
    transform: translateY(-2px);
}

.btn-sm {
    font-size: var(--hydron-font-size-xs);
    padding: 8px 18px;
}

.btn-lg {
    font-size: var(--hydron-font-size-lg);
    padding: 18px 44px;
}

@keyframes ctaGlow {
    0%, 100% { box-shadow: 0 0 20px rgba(0, 155, 58, 0.15); }
    50% { box-shadow: 0 0 35px rgba(0, 155, 58, 0.3); }
}

/* ===========================
   Header / Navigation
   =========================== */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--hydron-space-xl);
    height: 72px;
    background: rgba(5, 10, 15, 0.8);
    backdrop-filter: var(--hydron-glass-blur);
    -webkit-backdrop-filter: var(--hydron-glass-blur);
    border-bottom: 1px solid var(--hydron-border);
    transition: background var(--hydron-transition), box-shadow var(--hydron-transition);
}

.site-header.scrolled {
    background: rgba(10, 16, 24, 0.95);
    box-shadow: var(--hydron-shadow-lg);
}

.site-logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    flex-shrink: 0;
}

.site-logo:hover {
    opacity: 0.9;
}

.site-logo-img {
    height: 36px;
    width: auto;
    display: block;
}

.site-nav {
    display: flex;
    align-items: center;
    gap: var(--hydron-space-sm);
}

.site-nav a {
    color: var(--hydron-text-secondary);
    font-size: var(--hydron-font-size-sm);
    font-weight: 500;
    padding: 8px 14px;
    border-radius: var(--hydron-radius-sm);
    transition: color var(--hydron-transition), background var(--hydron-transition);
}

.site-nav a:hover {
    color: var(--hydron-text);
    background: var(--hydron-bg-glass);
}

.site-nav .btn-cta {
    color: var(--hydron-text-inverse);
    padding: 8px 20px;
    font-size: var(--hydron-font-size-xs);
    animation: none;
}

.site-nav .btn-cta:hover {
    color: var(--hydron-text-inverse);
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    color: var(--hydron-text);
}

.mobile-menu-toggle svg {
    width: 24px;
    height: 24px;
    stroke: currentColor;
    fill: none;
}

/* ===========================
   Content Padding (for fixed header)
   =========================== */

.site-content {
    padding-top: 72px;
}

/* ===========================
   CTA Footer Bar
   =========================== */

.cta-footer-bar {
    background:
        radial-gradient(ellipse at 30% 50%, rgba(0, 155, 58, 0.2) 0%, transparent 60%),
        radial-gradient(ellipse at 70% 50%, rgba(141, 198, 63, 0.15) 0%, transparent 60%),
        linear-gradient(135deg, rgba(0, 60, 40, 0.6), rgba(0, 30, 50, 0.6));
    border-top: 1px solid rgba(0, 155, 58, 0.3);
    border-bottom: 1px solid var(--hydron-border);
    padding: var(--hydron-space-2xl) 0;
}

.cta-footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--hydron-space-xl);
}

.cta-footer-inner h3 {
    font-size: var(--hydron-font-size-2xl);
    margin-bottom: 4px;
}

.cta-footer-inner p {
    color: var(--hydron-text-secondary);
    margin: 0;
}

/* ===========================
   Footer
   =========================== */

.site-footer {
    background: var(--hydron-bg-elevated);
    border-top: 1px solid var(--hydron-border);
    padding: var(--hydron-space-3xl) 0 var(--hydron-space-xl);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--hydron-space-2xl);
    margin-bottom: var(--hydron-space-2xl);
}

.footer-brand .site-logo-img {
    height: 40px;
}

.footer-brand p {
    color: var(--hydron-text-muted);
    font-size: var(--hydron-font-size-sm);
    max-width: 280px;
    margin-top: var(--hydron-space-md);
}

.footer-col h4 {
    font-size: var(--hydron-font-size-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--hydron-text-muted);
    margin-bottom: var(--hydron-space-md);
}

.footer-col a {
    display: block;
    color: var(--hydron-text-secondary);
    font-size: var(--hydron-font-size-sm);
    padding: 4px 0;
    transition: color var(--hydron-transition);
}

.footer-col a:hover {
    color: var(--hydron-accent);
}

.footer-bottom {
    border-top: 1px solid var(--hydron-border);
    padding-top: var(--hydron-space-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: var(--hydron-font-size-sm);
    color: var(--hydron-text-muted);
}

/* ===========================
   CTA Section (Reusable)
   =========================== */

.cta-section {
    padding: var(--hydron-space-4xl) 0;
    text-align: center;
    background:
        radial-gradient(ellipse at 30% 50%, rgba(0, 155, 58, 0.25) 0%, transparent 60%),
        radial-gradient(ellipse at 70% 50%, rgba(141, 198, 63, 0.18) 0%, transparent 60%),
        linear-gradient(180deg, rgba(0, 60, 40, 0.3), rgba(0, 155, 58, 0.08) 50%, rgba(0, 60, 40, 0.3));
}

.cta-section h2 {
    margin-bottom: var(--hydron-space-md);
}

.cta-section p {
    font-size: var(--hydron-font-size-lg);
    max-width: 560px;
    margin: 0 auto var(--hydron-space-xl);
}

/* ===========================
   Vibrant Section Backgrounds
   =========================== */

/* Lush green — rich living forest canopy */
.bg-lush {
    background-color: #0c3a22;
    background-image:
        radial-gradient(ellipse at 20% 10%, rgba(0, 155, 58, 0.5) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 90%, rgba(0, 180, 72, 0.4) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(0, 160, 64, 0.25) 0%, transparent 60%);
}

/* Deep earth — warm organic golden-green */
.bg-earth {
    background-color: #182810;
    background-image:
        radial-gradient(ellipse at 30% 0%, rgba(120, 200, 60, 0.45) 0%, transparent 50%),
        radial-gradient(ellipse at 70% 100%, rgba(180, 140, 50, 0.35) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(80, 140, 40, 0.2) 0%, transparent 60%);
}

/* Vibrant hero — bold green/teal gradient that commands attention */
.bg-hero-vibrant {
    position: relative;
    overflow: hidden;
}

.bg-hero-vibrant::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 25% 20%, rgba(0, 155, 58, 0.5) 0%, transparent 50%),
        radial-gradient(ellipse at 75% 80%, rgba(141, 198, 63, 0.35) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 0%, rgba(0, 155, 58, 0.4) 0%, transparent 55%),
        linear-gradient(180deg, #0e4530 0%, #0a1018 100%);
    z-index: 0;
}

.bg-hero-vibrant > * {
    position: relative;
    z-index: 1;
}

/* Aurora — animated flowing color wash */
.bg-aurora {
    position: relative;
    overflow: hidden;
    background-color: #0c3520;
}

.bg-aurora::before {
    content: '';
    position: absolute;
    inset: -50%;
    background:
        conic-gradient(
            from 0deg at 50% 50%,
            rgba(0, 155, 58, 0.35) 0deg,
            rgba(141, 198, 63, 0.28) 60deg,
            rgba(0, 196, 78, 0.22) 120deg,
            rgba(140, 200, 55, 0.28) 180deg,
            rgba(0, 155, 58, 0.35) 240deg,
            rgba(120, 180, 50, 0.22) 300deg,
            rgba(0, 155, 58, 0.35) 360deg
        );
    animation: auroraRotate 30s linear infinite;
    z-index: 0;
}

.bg-aurora > * {
    position: relative;
    z-index: 1;
}

@keyframes auroraRotate {
    0% { transform: rotate(0deg) scale(1.5); }
    100% { transform: rotate(360deg) scale(1.5); }
}

/* Warm sunlight — golden amber glow */
.bg-warm {
    background-color: #1e1808;
    background-image:
        radial-gradient(ellipse at 50% -10%, rgba(255, 200, 60, 0.45) 0%, transparent 50%),
        radial-gradient(ellipse at 20% 80%, rgba(0, 155, 58, 0.25) 0%, transparent 45%),
        radial-gradient(ellipse at 85% 40%, rgba(141, 198, 63, 0.2) 0%, transparent 45%);
}

/* Mesh gradient — rich 4-corner color wash */
.bg-mesh {
    background-color: #0c2418;
    background-image:
        radial-gradient(at 0% 0%, rgba(0, 155, 58, 0.45) 0%, transparent 50%),
        radial-gradient(at 100% 0%, rgba(141, 198, 63, 0.35) 0%, transparent 50%),
        radial-gradient(at 100% 100%, rgba(0, 155, 58, 0.3) 0%, transparent 50%),
        radial-gradient(at 0% 100%, rgba(120, 200, 60, 0.25) 0%, transparent 50%);
}

/* Glass cards on colored backgrounds — readable with solid backing */
.bg-lush .glass-card,
.bg-earth .glass-card,
.bg-warm .glass-card,
.bg-mesh .glass-card,
.bg-aurora .glass-card {
    background: rgba(6, 21, 16, 0.65);
    border-color: rgba(255, 255, 255, 0.18);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

.bg-lush .glass-card:hover,
.bg-earth .glass-card:hover,
.bg-warm .glass-card:hover,
.bg-mesh .glass-card:hover,
.bg-aurora .glass-card:hover {
    background: rgba(6, 21, 16, 0.75);
    border-color: rgba(0, 155, 58, 0.5);
    box-shadow: 0 0 40px rgba(0, 155, 58, 0.18), 0 8px 32px rgba(0, 0, 0, 0.3);
}

/* ===========================
   Scroll Reveal
   =========================== */

.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1), transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ===========================
   Monospace / Data
   =========================== */

.mono {
    font-family: var(--hydron-font-mono);
}

.data-label {
    font-family: var(--hydron-font-mono);
    font-size: var(--hydron-font-size-xs);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--hydron-text-muted);
}

.data-value {
    font-family: var(--hydron-font-mono);
    font-size: var(--hydron-font-size-lg);
    font-weight: 600;
    color: var(--hydron-text);
}

/* ===========================
   Status Indicators
   =========================== */

.status-dot {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    animation: statusPulse 2s ease-in-out infinite;
}

.status-dot.active { background: var(--hydron-accent); }
.status-dot.syncing { background: var(--hydron-accent-blue); }
.status-dot.optimizing { background: var(--hydron-accent-warm); }
.status-dot.learning { background: var(--hydron-accent-purple); }

@keyframes statusPulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(0.85); }
}

/* ===========================
   Form Styles
   =========================== */

.form-group {
    margin-bottom: var(--hydron-space-lg);
}

.form-label {
    display: block;
    font-size: var(--hydron-font-size-sm);
    font-weight: 500;
    color: var(--hydron-text-secondary);
    margin-bottom: var(--hydron-space-sm);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    font-family: var(--hydron-font);
    font-size: var(--hydron-font-size-base);
    color: var(--hydron-text);
    background: var(--hydron-bg-input);
    border: 1px solid var(--hydron-border);
    border-radius: var(--hydron-radius);
    padding: 12px 16px;
    transition: border-color var(--hydron-transition), box-shadow var(--hydron-transition);
    outline: none;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    border-color: var(--hydron-accent);
    box-shadow: 0 0 0 3px var(--hydron-accent-light);
}

.form-textarea {
    min-height: 120px;
    resize: vertical;
}

.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%237a8ba3' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    padding-right: 40px;
}

/* Native dropdown options (white bg on Windows/Mac) */
.form-select option {
    background: #1a2a22;
    color: #e8ecf1;
}

.form-select option:checked,
.form-select option:hover {
    background: var(--hydron-accent);
    color: #fff;
}

/* Placeholder readability */
.form-input::placeholder,
.form-textarea::placeholder {
    color: rgba(255, 255, 255, 0.35);
}

.form-select:invalid,
.form-select option[value=""] {
    color: rgba(255, 255, 255, 0.35);
}

/* ===========================
   Grid Utilities
   =========================== */

.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--hydron-space-xl);
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--hydron-space-xl);
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--hydron-space-xl);
}

/* ===========================
   Toast Notifications
   =========================== */

.hydron-toast {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 10000;
    padding: 14px 24px;
    border-radius: var(--hydron-radius);
    font-size: var(--hydron-font-size-sm);
    font-weight: 500;
    color: var(--hydron-text);
    background: var(--hydron-bg-elevated);
    border: 1px solid var(--hydron-border);
    box-shadow: var(--hydron-shadow-lg);
    transform: translateY(100px);
    opacity: 0;
    transition: all var(--hydron-transition);
}

.hydron-toast.show {
    transform: translateY(0);
    opacity: 1;
}

.hydron-toast.success { border-color: var(--hydron-accent); }
.hydron-toast.error { border-color: var(--hydron-accent-warm); }
.hydron-toast.warning { border-color: #eab308; }

/* ===========================
   Loading Spinner
   =========================== */

.loading-spinner {
    width: 24px;
    height: 24px;
    border: 2px solid var(--hydron-border);
    border-top-color: var(--hydron-accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ===========================
   Responsive
   =========================== */

@media (max-width: 1024px) {
    h1 { font-size: var(--hydron-font-size-4xl); }
    h2 { font-size: var(--hydron-font-size-3xl); }

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

    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    h1 { font-size: var(--hydron-font-size-3xl); }
    h2 { font-size: var(--hydron-font-size-2xl); }

    .container {
        padding: 0 var(--hydron-space-md);
    }

    .section {
        padding: var(--hydron-space-2xl) 0;
    }

    .mobile-menu-toggle {
        display: block;
    }

    .site-nav {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        bottom: 0;
        flex-direction: column;
        background: rgba(5, 10, 15, 0.98);
        backdrop-filter: var(--hydron-glass-blur);
        padding: var(--hydron-space-xl);
        gap: var(--hydron-space-sm);
        transform: translateX(100%);
        transition: transform var(--hydron-transition);
    }

    .site-nav.open {
        transform: translateX(0);
    }

    .site-nav a {
        font-size: var(--hydron-font-size-lg);
        padding: 14px;
    }

    .cta-footer-inner {
        flex-direction: column;
        text-align: center;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--hydron-space-xl);
    }

    .footer-bottom {
        flex-direction: column;
        gap: var(--hydron-space-sm);
        text-align: center;
    }

    .grid-2,
    .grid-3 {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    h1 { font-size: var(--hydron-font-size-2xl); }

    .grid-4 {
        grid-template-columns: 1fr;
    }
}