/* ============================================
   identity.ms — Design System
   Dark theme, monospace headings, technical aesthetic
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
    /* Colors */
    --bg: #09090b;
    --bg-alt: #0f0f12;
    --surface: #18181b;
    --surface-hover: #27272a;
    --border: #27272a;
    --border-hover: #3f3f46;
    --text: #fafafa;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    --accent: #3b82f6;
    --accent-light: #60a5fa;
    --accent-subtle: rgba(59, 130, 246, 0.08);
    --accent-glow: rgba(59, 130, 246, 0.15);
    --danger: #ef4444;

    /* Typography */
    --font-mono: "JetBrains Mono", "Fira Code", "Cascadia Code", monospace;
    --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;

    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 0.75rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;

    /* Borders & Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px var(--accent-glow);

    /* Transitions */
    --transition: 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- 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(--font-sans);
    font-size: var(--text-base);
    line-height: 1.7;
    color: var(--text);
    background-color: var(--bg);
}

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

a:hover {
    color: var(--text);
}

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

/* --- Accessibility --- */
.skip-link {
    position: absolute;
    top: -100%;
    left: var(--space-md);
    padding: var(--space-sm) var(--space-md);
    background: var(--accent);
    color: var(--text);
    border-radius: var(--radius-sm);
    z-index: 1000;
    font-size: var(--text-sm);
}

.skip-link:focus {
    top: var(--space-md);
}

:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* --- Layout --- */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-xl);
}

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

.section-alt {
    background-color: var(--bg-alt);
}

/* --- Navigation --- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(9, 9, 11, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    font-family: var(--font-mono);
    font-size: var(--text-xl);
    font-weight: 600;
    color: var(--text);
    letter-spacing: -0.02em;
}

.logo:hover {
    color: var(--text);
}

.logo-accent {
    color: var(--accent);
}

.nav-links {
    display: flex;
    gap: var(--space-xl);
}

.nav-links a {
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    color: var(--text-secondary);
    transition: color var(--transition);
    letter-spacing: 0.01em;
}

.nav-links a:hover {
    color: var(--text);
}

/* --- Hero --- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 64px;
    overflow: hidden;
}

.hero-grid-bg {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(59, 130, 246, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(59, 130, 246, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse 70% 50% at 50% 50%, black 20%, transparent 100%);
    -webkit-mask-image: radial-gradient(ellipse 70% 50% at 50% 50%, black 20%, transparent 100%);
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
}

.hero-title {
    font-family: var(--font-mono);
    font-size: var(--text-5xl);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-xl);
}

.hero-title-accent {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: var(--text-lg);
    color: var(--text-secondary);
    line-height: 1.8;
    max-width: 680px;
    margin-bottom: var(--space-2xl);
}

.hero-cta {
    margin-bottom: var(--space-3xl);
}

/* --- Trust Bar --- */
.trust-bar {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-lg);
    padding-top: var(--space-2xl);
    border-top: 1px solid var(--border);
}

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

.trust-number {
    display: block;
    font-family: var(--font-mono);
    font-size: clamp(var(--text-lg), 2vw, var(--text-2xl));
    font-weight: 700;
    color: var(--accent-light);
    letter-spacing: -0.02em;
    white-space: nowrap;
}

.trust-label {
    display: block;
    font-size: var(--text-xs);
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-top: var(--space-xs);
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-xl);
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    font-weight: 500;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
    letter-spacing: 0.01em;
}

.btn-primary {
    background: var(--accent);
    color: #fff;
    box-shadow: var(--shadow-md), 0 0 20px rgba(59, 130, 246, 0.2);
}

.btn-primary:hover {
    background: var(--accent-light);
    color: #fff;
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg), 0 0 30px rgba(59, 130, 246, 0.3);
}

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

/* --- Section Headers --- */
.section-header {
    margin-bottom: var(--space-3xl);
}

.section-tag {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    font-weight: 500;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    margin-bottom: var(--space-md);
    padding: var(--space-xs) var(--space-md);
    background: var(--accent-subtle);
    border: 1px solid rgba(59, 130, 246, 0.15);
    border-radius: var(--radius-sm);
}

.section-title {
    font-family: var(--font-mono);
    font-size: var(--text-4xl);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-md);
}

.section-subtitle {
    font-size: var(--text-lg);
    color: var(--text-secondary);
    max-width: 640px;
    line-height: 1.7;
}

/* --- Problem Cards --- */
.problem-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
}

.problem-card {
    padding: var(--space-2xl);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition: all var(--transition);
}

.problem-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.problem-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    background: var(--accent-subtle);
    color: var(--accent);
    margin-bottom: var(--space-lg);
}

.problem-title {
    font-family: var(--font-mono);
    font-size: var(--text-lg);
    font-weight: 600;
    margin-bottom: var(--space-md);
    letter-spacing: -0.01em;
}

.problem-text {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    line-height: 1.7;
}

/* --- Service Cards --- */
.services-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-xl);
}

.service-card {
    padding: var(--space-2xl);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition: all var(--transition);
}

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

.service-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: var(--accent-subtle);
    color: var(--accent);
    margin-bottom: var(--space-lg);
}

.service-title {
    font-family: var(--font-mono);
    font-size: var(--text-lg);
    font-weight: 600;
    margin-bottom: var(--space-md);
    letter-spacing: -0.01em;
}

.service-description {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-lg);
}

.service-features {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.service-features li {
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    color: var(--text-muted);
    padding-left: var(--space-lg);
    position: relative;
}

.service-features li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--accent);
}

/* --- Credential Cards --- */
.credentials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
}

.credential-card {
    padding: var(--space-2xl);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition: all var(--transition);
}

.credential-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.credential-label {
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    font-weight: 600;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.credential-link {
    text-decoration: none;
    transition: color 0.2s ease;
}

.credential-link:hover {
    color: var(--accent-light);
}

.credential-title {
    font-family: var(--font-mono);
    font-size: var(--text-base);
    font-weight: 600;
    margin-top: var(--space-sm);
    margin-bottom: var(--space-md);
    letter-spacing: -0.01em;
}

.credential-text {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    line-height: 1.7;
}

/* --- Contact --- */
.contact-layout {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: var(--space-3xl);
    align-items: start;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.contact-method {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    font-size: var(--text-sm);
    color: var(--text-secondary);
}

.contact-method svg {
    color: var(--accent);
    flex-shrink: 0;
}

.contact-method a {
    color: var(--text-secondary);
}

.contact-method a:hover {
    color: var(--accent-light);
}

.contact-note {
    margin-top: var(--space-md);
    padding: var(--space-lg);
    background: var(--accent-subtle);
    border: 1px solid rgba(59, 130, 246, 0.12);
    border-radius: var(--radius-md);
}

.contact-note p {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    line-height: 1.7;
}

/* --- Form --- */
.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.form-group label {
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.form-group label span {
    color: var(--accent);
}

.form-group input,
.form-group textarea {
    padding: var(--space-sm) var(--space-md);
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    color: var(--text);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    transition: border-color var(--transition), box-shadow var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-subtle);
}

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

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

/* --- Footer --- */
.footer {
    padding: var(--space-2xl) 0;
    border-top: 1px solid var(--border);
}

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

.footer-brand .logo {
    font-size: var(--text-lg);
}

.footer-tagline {
    font-size: var(--text-xs);
    color: var(--text-muted);
    margin-top: var(--space-xs);
}

.footer-meta p {
    font-size: var(--text-xs);
    color: var(--text-muted);
}

/* --- Scroll Animations --- */
.problem-card,
.service-card,
.credential-card,
.trust-stat {
    opacity: 0;
    transform: translateY(16px);
}

.animate-in {
    animation: fadeSlideUp 0.5s ease forwards;
}

@keyframes fadeSlideUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* --- Responsive: 1024px --- */
@media (max-width: 1024px) {
    .contact-layout {
        grid-template-columns: 1fr;
    }

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

/* --- Responsive: 768px --- */
@media (max-width: 768px) {
    :root {
        --text-5xl: 2.25rem;
        --text-4xl: 1.75rem;
        --text-3xl: 1.5rem;
    }

    .section {
        padding: var(--space-3xl) 0;
    }

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

    .nav-container {
        padding: 0 var(--space-lg);
    }

    .nav-links {
        gap: var(--space-md);
    }

    .nav-links a {
        font-size: var(--text-xs);
    }

    .hero {
        min-height: auto;
        padding-top: calc(64px + var(--space-3xl));
        padding-bottom: var(--space-3xl);
    }

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

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

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

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

    .section-header {
        margin-bottom: var(--space-2xl);
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
        gap: var(--space-md);
    }
}

/* --- Responsive: 480px --- */
@media (max-width: 480px) {
    .nav-container {
        flex-direction: column;
        height: auto;
        padding: var(--space-md) var(--space-md);
        gap: var(--space-sm);
    }

    .nav-links {
        gap: var(--space-sm);
        flex-wrap: wrap;
        justify-content: center;
    }

    .trust-bar {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-md);
    }

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

/* --- 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;
    }

    .problem-card,
    .service-card,
    .credential-card,
    .trust-stat {
        opacity: 1;
        transform: none;
    }
}