/* ========================================
   Zero Entry Security — Design System
   ======================================== */

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

:root {
    /* Core palette */
    --color-bg: #0a0a0f;
    --color-surface: #12121a;
    --color-surface-elevated: #1a1a26;
    --color-border: rgba(255, 255, 255, 0.06);
    --color-border-hover: rgba(255, 255, 255, 0.12);

    /* Text */
    --color-text: #f0f0f5;
    --color-text-secondary: #8a8a9e;
    --color-text-muted: #5a5a72;

    /* Accent — a calm, trustworthy teal-cyan */
    --color-accent: #3ecfb4;
    --color-accent-hover: #56e8cc;
    --color-accent-glow: rgba(62, 207, 180, 0.15);
    --color-accent-subtle: rgba(62, 207, 180, 0.08);

    /* Secondary accent */
    --color-secondary: #6e7bf2;
    --color-secondary-glow: rgba(110, 123, 242, 0.12);

    /* Layout */
    --max-width: 1120px;
    --section-padding: 120px 24px;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-smooth: 400ms cubic-bezier(0.16, 1, 0.3, 1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

a {
    text-decoration: none;
    color: inherit;
}

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

/* --- Ambient Background --- */
.bg-grid {
    position: fixed;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.015) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
    background-size: 64px 64px;
    pointer-events: none;
    z-index: 0;
}

.bg-glow {
    position: fixed;
    border-radius: 50%;
    filter: blur(120px);
    pointer-events: none;
    z-index: 0;
}

.bg-glow--1 {
    width: 600px;
    height: 600px;
    background: var(--color-accent-glow);
    top: -200px;
    right: -100px;
    opacity: 0.5;
}

.bg-glow--2 {
    width: 500px;
    height: 500px;
    background: var(--color-secondary-glow);
    bottom: -150px;
    left: -100px;
    opacity: 0.4;
}

/* --- Container --- */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* --- Navigation --- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 16px 24px;
    transition: background var(--transition-base), backdrop-filter var(--transition-base);
}

.nav.scrolled {
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--color-border);
}

.nav__inner {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav__logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.05rem;
    letter-spacing: -0.02em;
    color: var(--color-text);
}

.nav__logo-icon {
    width: 28px;
    height: 28px;
    color: var(--color-accent);
}

.nav__cta {
    padding: 10px 22px;
    border-radius: var(--radius-sm);
    background: var(--color-accent-subtle);
    color: var(--color-accent);
    font-weight: 600;
    font-size: 0.875rem;
    transition: background var(--transition-fast), transform var(--transition-fast);
    border: 1px solid rgba(62, 207, 180, 0.15);
}

.nav__cta:hover {
    background: rgba(62, 207, 180, 0.18);
    transform: translateY(-1px);
}

.nav__links {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav__link {
    padding: 10px 20px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

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

/* --- Hero --- */
.hero {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 140px 24px 100px;
}

.hero__container {
    max-width: 800px;
    text-align: center;
}

.hero__badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 18px;
    border-radius: 100px;
    background: var(--color-accent-subtle);
    border: 1px solid rgba(62, 207, 180, 0.12);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-accent);
    letter-spacing: 0.03em;
    text-transform: uppercase;
    margin-bottom: 32px;
    animation: fadeInUp 0.6s ease both;
}

.hero__badge-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-accent);
    animation: pulse 2s ease infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.4); }
}

.hero__title {
    font-size: clamp(2.5rem, 6vw, 4.2rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.035em;
    margin-bottom: 24px;
    animation: fadeInUp 0.6s ease 0.1s both;
}

.hero__title--gradient {
    background: linear-gradient(135deg, var(--color-accent), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero__subtitle {
    font-size: 1.15rem;
    color: var(--color-text-secondary);
    max-width: 580px;
    margin: 0 auto 40px;
    line-height: 1.7;
    animation: fadeInUp 0.6s ease 0.2s both;
}

.hero__actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 64px;
    animation: fadeInUp 0.6s ease 0.3s both;
}

.hero__proof {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 32px;
    animation: fadeInUp 0.6s ease 0.4s both;
}

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

.hero__proof-number {
    display: block;
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--color-text);
    letter-spacing: -0.03em;
}

.hero__proof-label {
    font-size: 0.78rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    font-weight: 500;
}

.hero__proof-divider {
    width: 1px;
    height: 40px;
    background: var(--color-border);
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.95rem;
    transition: all var(--transition-fast);
    cursor: pointer;
    border: none;
    white-space: nowrap;
}

.btn--primary {
    background: var(--color-accent);
    color: var(--color-bg);
    box-shadow: 0 0 0 0 var(--color-accent-glow);
}

.btn--primary:hover {
    background: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 32px var(--color-accent-glow);
}

.btn--ghost {
    background: transparent;
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
}

.btn--ghost:hover {
    color: var(--color-text);
    border-color: var(--color-border-hover);
    background: rgba(255, 255, 255, 0.03);
}

.btn--lg {
    padding: 18px 36px;
    font-size: 1.05rem;
    border-radius: var(--radius-md);
}

/* --- Sections --- */
.section {
    position: relative;
    z-index: 1;
    padding: var(--section-padding);
}

.section__eyebrow {
    font-size: 0.78rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-accent);
    margin-bottom: 16px;
}

.section__title {
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.03em;
    margin-bottom: 20px;
}

.section__desc {
    font-size: 1.05rem;
    color: var(--color-text-secondary);
    max-width: 620px;
    line-height: 1.7;
    margin-bottom: 56px;
}

/* --- Pain Grid --- */
.pain-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.pain-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 36px 32px;
    transition: border-color var(--transition-base), transform var(--transition-smooth);
}

.pain-card:hover {
    border-color: var(--color-border-hover);
    transform: translateY(-4px);
}

.pain-card__icon {
    font-size: 2rem;
    margin-bottom: 20px;
}

.pain-card__title {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 10px;
    letter-spacing: -0.01em;
}

.pain-card__desc {
    font-size: 0.92rem;
    color: var(--color-text-secondary);
    line-height: 1.65;
}

/* --- Steps --- */
.steps {
    display: flex;
    flex-direction: column;
    gap: 0;
    max-width: 640px;
}

.step {
    display: flex;
    gap: 32px;
    padding: 40px 0;
    border-bottom: 1px solid var(--color-border);
    align-items: flex-start;
}

.step:last-child {
    border-bottom: none;
}

.step__number {
    font-size: 3rem;
    font-weight: 800;
    color: var(--color-accent);
    opacity: 0.25;
    line-height: 1;
    letter-spacing: -0.05em;
    flex-shrink: 0;
    width: 72px;
}

.step__title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: -0.01em;
}

.step__desc {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* --- Differentiator Grid --- */
.diff-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.diff-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 36px 32px;
    transition: border-color var(--transition-base), transform var(--transition-smooth);
}

.diff-card:hover {
    border-color: var(--color-border-hover);
    transform: translateY(-4px);
}

.diff-card__header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 14px;
}

.diff-card__header svg {
    color: var(--color-accent);
    flex-shrink: 0;
}

.diff-card__header h3 {
    font-size: 1.05rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.diff-card p {
    font-size: 0.92rem;
    color: var(--color-text-secondary);
    line-height: 1.65;
}

/* --- CTA Section --- */
.section--cta {
    padding-bottom: 80px;
}

.cta-card {
    background: linear-gradient(135deg, rgba(62, 207, 180, 0.06), rgba(110, 123, 242, 0.06));
    border: 1px solid rgba(62, 207, 180, 0.1);
    border-radius: var(--radius-xl);
    padding: 72px 48px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 30%, var(--color-accent-glow), transparent 50%);
    opacity: 0.3;
    pointer-events: none;
}

.cta-card__title {
    font-size: clamp(1.6rem, 3.5vw, 2.4rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 16px;
    position: relative;
}

.cta-card__desc {
    font-size: 1.05rem;
    color: var(--color-text-secondary);
    max-width: 520px;
    margin: 0 auto 36px;
    line-height: 1.7;
    position: relative;
}

.cta-card__note {
    margin-top: 16px;
    font-size: 0.82rem;
    color: var(--color-text-muted);
    position: relative;
}

/* --- Footer --- */
.footer {
    position: relative;
    z-index: 1;
    padding: 40px 24px;
    border-top: 1px solid var(--color-border);
}

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

.footer__brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--color-text-secondary);
}

.footer__logo-icon {
    width: 24px;
    height: 24px;
    color: var(--color-accent);
}

.footer__copy {
    font-size: 0.82rem;
    color: var(--color-text-muted);
}

/* --- Animations --- */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Intersection Observer reveal */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* --- Responsive --- */
@media (max-width: 768px) {
    :root {
        --section-padding: 80px 20px;
    }

    .hero {
        padding: 120px 20px 80px;
        min-height: auto;
    }

    .hero__proof {
        gap: 20px;
    }

    .hero__proof-number {
        font-size: 1.3rem;
    }

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

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

    .step {
        gap: 20px;
    }

    .step__number {
        font-size: 2.2rem;
        width: 48px;
    }

    .cta-card {
        padding: 48px 28px;
    }

    .footer__inner {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero__actions {
        flex-direction: column;
        align-items: center;
    }

    .hero__proof {
        flex-direction: column;
        gap: 16px;
    }

    .hero__proof-divider {
        width: 40px;
        height: 1px;
    }
}