/* ==========================================================================
   SKT Retail Tech — Futuristic Dark Theme
   ========================================================================== */

/* ── Custom Properties ─────────────────────────────────────────────────── */
:root {
    --bg-deep:    #0A0A0F;
    --bg-card:    #12141A;
    --bg-surface: #181B24;
    --cyan:       #06B6D4;
    --blue:       #3B82F6;
    --white:      #FFFFFF;
    --gray-100:   #F1F5F9;
    --gray-300:   #CBD5E1;
    --gray-500:   #64748B;
    --gray-700:   #334155;

    --font-head: 'Space Grotesk', sans-serif;
    --font-body: 'DM Sans', sans-serif;

    --glow-cyan:  0 0 20px rgba(6,182,212,0.35);
    --glow-blue:  0 0 20px rgba(59,130,246,0.30);
    --ease-out:   cubic-bezier(0.16, 1, 0.3, 1);
    --speed:      0.35s;
    --max-w:      1200px;
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
    font-family: var(--font-body);
    background: var(--bg-deep);
    color: var(--gray-300);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

h1,h2,h3,h4,h5,h6 {
    font-family: var(--font-head);
    color: var(--white);
    line-height: 1.15;
}

a { text-decoration: none; color: var(--cyan); transition: color var(--speed); }
a:hover { color: var(--white); }

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

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

/* ── Utilities ─────────────────────────────────────────────────────────── */
.container { width: 100%; max-width: var(--max-w); margin: 0 auto; padding: 0 1.5rem; }

.section { padding: 7rem 0; position: relative; }
.section-dark { background: var(--bg-card); }

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

/* ── Buttons ───────────────────────────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    padding: .85rem 2rem;
    font-family: var(--font-head);
    font-weight: 600;
    font-size: .95rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--speed) var(--ease-out);
}

.btn-glow {
    background: linear-gradient(135deg, var(--cyan), var(--blue));
    color: var(--white);
    box-shadow: var(--glow-cyan);
}
.btn-glow:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(6,182,212,0.55), 0 8px 24px rgba(0,0,0,.4);
    color: var(--white);
}

.btn-outline {
    background: transparent;
    border: 1.5px solid rgba(255,255,255,.25);
    color: var(--white);
}
.btn-outline:hover {
    border-color: var(--cyan);
    color: var(--cyan);
    box-shadow: var(--glow-cyan);
}

.btn-lg { padding: 1.1rem 2.5rem; font-size: 1.05rem; }

/* ── Navbar ────────────────────────────────────────────────────────────── */
.navbar {
    position: fixed; top: 0; left: 0; width: 100%;
    z-index: 900;
    padding: 1.25rem 0;
    transition: background var(--speed), padding var(--speed), box-shadow var(--speed);
}
.navbar.scrolled {
    background: rgba(10,10,15,.92);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    padding: .85rem 0;
    box-shadow: 0 1px 0 rgba(6,182,212,.12);
}

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

/* Logo */
.logo {
    display: flex; align-items: center; gap: .55rem;
    color: var(--white);
}
.logo i { font-size: 1.6rem; color: var(--cyan); }
.logo-text {
    font-family: var(--font-head);
    font-size: 1.65rem;
    font-weight: 700;
    letter-spacing: 2px;
}

.nav-links { display: flex; gap: 2rem; }

.nav-link {
    color: var(--gray-300);
    font-size: .92rem;
    font-weight: 500;
    position: relative;
    padding: .35rem 0;
}
.nav-link::after {
    content: '';
    position: absolute; bottom: 0; left: 0;
    width: 0; height: 2px;
    background: var(--cyan);
    transition: width var(--speed) var(--ease-out);
}
.nav-link:hover { color: var(--white); }
.nav-link:hover::after { width: 100%; }

.nav-cta { display: inline-flex; }

/* Burger */
.burger {
    display: none; background: none; border: none; cursor: pointer;
    flex-direction: column; gap: 5px; z-index: 999;
}
.burger span {
    display: block; width: 24px; height: 2px;
    background: var(--white);
    transition: var(--speed) var(--ease-out);
}
.burger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.burger.active span:nth-child(2) { opacity: 0; }
.burger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── Hero ──────────────────────────────────────────────────────────────── */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    padding-top: 5rem;
}

#hero-canvas {
    position: absolute; inset: 0;
    width: 100%; height: 100%;
    z-index: 0;
}

.hero-overlay {
    position: absolute; inset: 0;
    background: linear-gradient(180deg, rgba(10,10,15,.55) 0%, rgba(10,10,15,.92) 100%);
    z-index: 1;
}

.hero-inner {
    position: relative; z-index: 2;
    display: flex; flex-direction: column; gap: 4rem;
}

.hero-badge {
    display: inline-flex; align-items: center; gap: .5rem;
    padding: .45rem 1rem;
    background: rgba(6,182,212,.1);
    border: 1px solid rgba(6,182,212,.25);
    border-radius: 999px;
    font-size: .82rem;
    font-weight: 500;
    color: var(--cyan);
    margin-bottom: 1.25rem;
}

.hero-title {
    font-size: clamp(2.4rem, 5.5vw, 4.5rem);
    margin-bottom: 1.25rem;
}

.hero-sub {
    max-width: 620px;
    font-size: 1.12rem;
    color: var(--gray-300);
    margin-bottom: 2.25rem;
}

.hero-buttons { display: flex; gap: 1rem; flex-wrap: wrap; }

/* Stats bar */
.hero-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    padding: 2rem 2.5rem;
    background: rgba(18,20,26,.75);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(6,182,212,.12);
    border-radius: 16px;
}

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

.stat-value {
    display: block;
    font-family: var(--font-head);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--cyan);
    line-height: 1.2;
}

.stat-label {
    font-size: .8rem;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-top: .25rem;
}

/* ── Section Typography ────────────────────────────────────────────────── */
.section-tag {
    display: inline-flex; align-items: center; gap: .45rem;
    font-family: var(--font-head);
    font-size: .78rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--cyan);
    margin-bottom: 1rem;
}

.section-heading {
    font-size: clamp(1.8rem, 3vw, 2.75rem);
    margin-bottom: 1.25rem;
}

.section-intro { max-width: 650px; margin-bottom: 3.5rem; }
.section-intro.center, .section-intro .center { margin-left: auto; margin-right: auto; }
.section-sub { color: var(--gray-500); font-size: 1.05rem; }

/* ── Grid helpers ──────────────────────────────────────────────────────── */
.grid-2col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

/* ── About ─────────────────────────────────────────────────────────────── */
.about-text p {
    color: var(--gray-300);
    font-size: 1.02rem;
    margin-bottom: 1rem;
}

.about-metrics {
    display: flex; gap: 2rem; margin-top: 2rem;
}
.metric {
    display: flex; align-items: flex-start; gap: .75rem;
}
.metric i {
    font-size: 1.5rem; color: var(--cyan); margin-top: 2px;
}
.metric strong {
    display: block; color: var(--white);
    font-family: var(--font-head); font-size: 1.1rem;
}
.metric span { font-size: .85rem; color: var(--gray-500); }

/* Hex grid visual */
.about-visual {
    display: flex; justify-content: center; align-items: center;
}
.hex-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    max-width: 360px;
}
.hex-cell {
    aspect-ratio: 1;
    background: var(--bg-card);
    border: 1px solid rgba(6,182,212,.1);
    border-radius: 16px;
    display: flex; flex-direction: column;
    justify-content: center; align-items: center;
    gap: .4rem;
    transition: all var(--speed) var(--ease-out);
}
.hex-cell i { font-size: 1.8rem; color: var(--gray-500); transition: color var(--speed); }
.hex-cell span { font-size: .75rem; font-weight: 600; color: var(--gray-500); text-transform: uppercase; letter-spacing: 1px; }
.hex-cell.active { border-color: rgba(6,182,212,.35); }
.hex-cell.active i { color: var(--cyan); }
.hex-cell.active span { color: var(--cyan); }
.hex-cell:hover {
    border-color: var(--cyan);
    box-shadow: var(--glow-cyan);
    transform: translateY(-4px);
}
.hex-cell:hover i { color: var(--cyan); }
.hex-cell:hover span { color: var(--white); }

/* ── Solutions ─────────────────────────────────────────────────────────── */
.solutions-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.sol-card {
    background: var(--bg-surface);
    border: 1px solid rgba(255,255,255,.04);
    border-radius: 14px;
    padding: 2.25rem 2rem;
    transition: all var(--speed) var(--ease-out);
    position: relative;
    overflow: hidden;
}
.sol-card::before {
    content: '';
    position: absolute; top: 0; left: 0; right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--cyan), transparent);
    opacity: 0;
    transition: opacity var(--speed);
}
.sol-card:hover {
    border-color: rgba(6,182,212,.2);
    transform: translateY(-6px);
    box-shadow: 0 12px 40px rgba(0,0,0,.35), var(--glow-cyan);
}
.sol-card:hover::before { opacity: 1; }

.sol-icon {
    width: 52px; height: 52px;
    background: rgba(6,182,212,.08);
    border-radius: 12px;
    display: flex; justify-content: center; align-items: center;
    margin-bottom: 1.5rem;
}
.sol-icon i { font-size: 1.5rem; color: var(--cyan); }

.sol-card h3 { font-size: 1.15rem; margin-bottom: .75rem; }
.sol-card p { color: var(--gray-500); font-size: .92rem; line-height: 1.65; }

/* ── Innovation ────────────────────────────────────────────────────────── */
.innovation-blocks { display: flex; flex-direction: column; gap: 2rem; }

.inno-block {
    display: flex; gap: 2.5rem; align-items: flex-start;
    padding: 2.5rem;
    background: var(--bg-card);
    border: 1px solid rgba(255,255,255,.04);
    border-radius: 16px;
    transition: all var(--speed) var(--ease-out);
    position: relative;
    overflow: hidden;
}
.inno-block::after {
    content: '';
    position: absolute; left: 0; top: 0; bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, var(--cyan), var(--blue));
    opacity: 0;
    transition: opacity var(--speed);
}
.inno-block:hover {
    border-color: rgba(6,182,212,.15);
    box-shadow: 0 8px 32px rgba(0,0,0,.3);
}
.inno-block:hover::after { opacity: 1; }

.inno-number {
    font-family: var(--font-head);
    font-size: 3rem;
    font-weight: 700;
    color: rgba(6,182,212,.15);
    line-height: 1;
    flex-shrink: 0;
    min-width: 70px;
}

.inno-body h3 { font-size: 1.25rem; margin-bottom: .75rem; }
.inno-body p { color: var(--gray-500); font-size: .95rem; margin-bottom: 1rem; }

.inno-tags { display: flex; gap: .5rem; flex-wrap: wrap; }
.inno-tags span {
    padding: .3rem .75rem;
    background: rgba(6,182,212,.06);
    border: 1px solid rgba(6,182,212,.15);
    border-radius: 999px;
    font-size: .72rem;
    font-weight: 600;
    color: var(--cyan);
    text-transform: uppercase;
    letter-spacing: .5px;
}

/* ── CTA ───────────────────────────────────────────────────────────────── */
.cta-section {
    background: linear-gradient(135deg, rgba(6,182,212,.06) 0%, rgba(59,130,246,.06) 100%);
    border-top: 1px solid rgba(6,182,212,.1);
    border-bottom: 1px solid rgba(6,182,212,.1);
}
.cta-inner {
    text-align: center;
    max-width: 650px;
    margin: 0 auto;
}
.cta-icon { font-size: 2.5rem; color: var(--cyan); margin-bottom: 1.25rem; }
.cta-inner h2 { font-size: 2.25rem; margin-bottom: 1rem; }
.cta-inner p { color: var(--gray-500); font-size: 1.05rem; margin-bottom: 2rem; }

/* ── Contact ───────────────────────────────────────────────────────────── */
.contact-grid { gap: 3rem; }

.contact-info p { color: var(--gray-500); margin-bottom: 2rem; font-size: 1.02rem; }

.contact-details { display: flex; flex-direction: column; gap: 1.5rem; }

.c-detail {
    display: flex; align-items: flex-start; gap: 1rem;
}
.c-detail i { font-size: 1.4rem; color: var(--cyan); margin-top: 3px; }
.c-detail strong { display: block; color: var(--white); font-size: .95rem; margin-bottom: .15rem; }
.c-detail span { color: var(--gray-500); font-size: .9rem; line-height: 1.5; }

.contact-form-wrap {
    background: var(--bg-surface);
    border: 1px solid rgba(255,255,255,.06);
    border-radius: 16px;
    padding: 2.5rem;
}

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

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

.form-group label {
    display: block;
    font-size: .82rem;
    font-weight: 600;
    color: var(--gray-300);
    margin-bottom: .45rem;
    font-family: var(--font-head);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: .8rem 1rem;
    background: var(--bg-card);
    border: 1px solid rgba(255,255,255,.08);
    border-radius: 8px;
    color: var(--white);
    font-family: var(--font-body);
    font-size: .95rem;
    transition: border-color var(--speed), box-shadow var(--speed);
}
.form-group input::placeholder,
.form-group textarea::placeholder { color: var(--gray-700); }

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--cyan);
    box-shadow: 0 0 0 3px rgba(6,182,212,.12);
}

.form-group textarea { resize: vertical; }

/* ── Footer ────────────────────────────────────────────────────────────── */
.footer {
    background: var(--bg-deep);
    border-top: 1px solid rgba(255,255,255,.05);
    padding: 4rem 0 0;
}

.footer-top {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    padding-bottom: 3rem;
    border-bottom: 1px solid rgba(255,255,255,.06);
}

.footer-brand p { color: var(--gray-500); margin-top: .75rem; font-size: .9rem; line-height: 1.6; }
.footer-brand .logo { margin-bottom: .5rem; }

.footer-col h4 {
    font-size: .85rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 1.25rem;
    color: var(--gray-300);
}
.footer-col a {
    display: block;
    color: var(--gray-500);
    font-size: .9rem;
    margin-bottom: .6rem;
    transition: color var(--speed), padding-left var(--speed);
}
.footer-col a:hover { color: var(--cyan); padding-left: 4px; }

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 0;
    font-size: .82rem;
    color: var(--gray-700);
}

.footer-legal { display: flex; gap: 1.5rem; }
.footer-legal a { color: var(--gray-700); }
.footer-legal a:hover { color: var(--cyan); }

/* ── Reveal Animations ─────────────────────────────────────────────────── */
[data-reveal] {
    opacity: 0;
    transform: translateY(32px);
    transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}
[data-reveal].visible {
    opacity: 1;
    transform: translateY(0);
}

/* stagger children in grids */
.solutions-grid [data-reveal]:nth-child(2) { transition-delay: .08s; }
.solutions-grid [data-reveal]:nth-child(3) { transition-delay: .16s; }
.solutions-grid [data-reveal]:nth-child(4) { transition-delay: .24s; }
.solutions-grid [data-reveal]:nth-child(5) { transition-delay: .32s; }
.solutions-grid [data-reveal]:nth-child(6) { transition-delay: .40s; }

/* ── Grid lines decorative background ──────────────────────────────────── */
.section::before {
    content: '';
    position: absolute; inset: 0;
    background-image:
        linear-gradient(rgba(6,182,212,.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(6,182,212,.03) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
}

/* ── Responsive ────────────────────────────────────────────────────────── */
@media (max-width: 1024px) {
    .grid-2col { grid-template-columns: 1fr; gap: 3rem; }
    .solutions-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-top { grid-template-columns: 1fr 1fr; }
    .hero-stats { grid-template-columns: repeat(2, 1fr); }
    .nav-cta { display: none; }
}

@media (max-width: 768px) {
    .burger { display: flex; }

    .nav-links {
        position: fixed; top: 0; left: 0;
        width: 100%; height: 100vh;
        background: rgba(10,10,15,.97);
        backdrop-filter: blur(20px);
        flex-direction: column;
        justify-content: center; align-items: center;
        gap: 2rem;
        transform: translateX(100%);
        transition: transform var(--speed) var(--ease-out);
    }
    .nav-links.open { transform: translateX(0); }
    .nav-link { font-size: 1.25rem; }

    .solutions-grid { grid-template-columns: 1fr; }
    .inno-block { flex-direction: column; gap: 1rem; }
    .inno-number { font-size: 2rem; }
    .hero-stats { grid-template-columns: repeat(2, 1fr); padding: 1.5rem; }
    .form-row { grid-template-columns: 1fr; }
    .footer-top { grid-template-columns: 1fr; gap: 2rem; }
    .footer-bottom { flex-direction: column; gap: .75rem; text-align: center; }
    .about-metrics { flex-direction: column; gap: 1.25rem; }
}

@media (max-width: 480px) {
    .section { padding: 4.5rem 0; }
    .hero-title { font-size: 2rem; }
    .hero-stats { grid-template-columns: 1fr 1fr; gap: 1rem; }
    .contact-form-wrap { padding: 1.5rem; }
    .hex-grid { max-width: 260px; gap: .6rem; }
}