/* ============================================
   Huodian Electronic Technology
   Stylesheet — Premium Deep-Space Tech Theme
   Palette: Deep Obsidian → Royal Indigo → Electric Violet → Neon Cyan
   ============================================ */

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

:root {
    /* ══════════════════════════════════════
       Apple Premium Gray + Fire Orange Palette
       (Apple iOS / HIG inspired neutral system)
       ══════════════════════════════════════ */

    /* --- Surfaces: Apple cool neutral grays --- */
    --apple-bg:      #f5f5f7;   /* page background  */
    --apple-bg-2:    #fbfbfd;   /* section background */
    --surface:       #ffffff;   /* elevated card surface */
    --surface-2:     #fafafa;   /* hovered surface elevation */
    --apple-border:  #d2d2d7;   /* thin neutral border */
    --apple-border-soft: #e8e8ed;
    --apple-divider: rgba(0, 0, 0, 0.08);

    /* --- Ink: Apple signature neutral text family --- */
    --ink-900:  #1d1d1f;   /* primary text / Apple Black */
    --ink-800:  #2c2c2e;   /* heavy subtext / deep buttons */
    --ink-700:  #3a3a3c;
    --ink-600:  #48484a;
    --gray-500: #6e6e73;   /* secondary text / labels */
    --gray-400: #86868b;   /* muted captions */
    --gray-300: #a1a1a6;
    --gray-200: #c7c7cc;

    /* --- Charcoal dark surfaces (Hero / Advantages / Footer premium dark sections) --- */
    --charcoal-950: #0a0a0c;   /* deepest */
    --charcoal-900: #111214;   /* dark hero bg */
    --charcoal-800: #16171a;   /* elevated dark */
    --charcoal-700: #1c1d20;
    --charcoal-600: #232428;
    --graphite-1:  #e8e8ed;    /* text on dark primary */
    --graphite-2:  #a1a1a6;    /* text on dark secondary */

    /* --- Fire Orange Signature (iOS / Apple refined) --- */
    --fire-600: #ff3b00;       /* deep ember hot core */
    --fire-500: #ff6a00;       /* core fire orange */
    --fire-400: #ff8a00;       /* flame orange */
    --fire-300: #ffa514;       /* warm golden amber   */
    --fire-200: #ffbd4a;
    --fire-100: #ffe3bf;
    --fire-tint:  rgba(255, 106, 0, 0.10);
    --fire-tint-2: rgba(255, 106, 0, 0.18);
    --fire-glow:   rgba(255, 106, 0, 0.55);
    --fire-glow-soft: rgba(255, 106, 0, 0.28);

    /* --- Semantic accents --- */
    --accent:       var(--fire-500);
    --accent-deep:  var(--fire-600);
    --accent-soft:  var(--fire-300);
    --accent-2:     var(--ink-900);   /* primary button deep ink, Apple "Buy" style */

    /* --- Compatibility tokens (kept to avoid breaking old selectors) --- */
    --obsidian-950: var(--charcoal-950);
    --obsidian-900: var(--charcoal-900);
    --obsidian-800: var(--charcoal-800);
    --obsidian-700: var(--charcoal-700);
    --royal-700:    var(--ink-900);
    --royal-600:    var(--ink-800);
    --royal-500:    var(--ink-700);
    --violet-600:   var(--fire-500);
    --violet-500:   var(--fire-400);
    --violet-400:   var(--fire-300);
    --cyan-500:     var(--fire-600);
    --cyan-400:     var(--fire-500);
    --cyan-300:     var(--fire-300);
    --aurora:       var(--fire-500);
    --white:        #ffffff;
    --silver-50:    var(--apple-bg);
    --silver-100:   var(--apple-bg-2);
    --silver-200:   var(--apple-border);
    --slate-400:    var(--gray-400);
    --slate-500:    var(--gray-500);
    --slate-600:    var(--ink-700);

    /* Content colors */
    --text: var(--ink-900);
    --text-muted: var(--gray-500);
    --text-on-dark: var(--graphite-1);
    --text-on-dark-muted: var(--graphite-2);

    /* ══════════════════════════════════════
       Signature Gradients — Apple Premium
       ══════════════════════════════════════ */
    --gradient-primary: linear-gradient(135deg,
        var(--fire-600) 0%,
        var(--fire-500) 40%,
        var(--fire-400) 70%,
        var(--fire-300) 100%);

    --gradient-primary-soft: linear-gradient(135deg,
        var(--fire-500) 0%,
        var(--fire-300) 100%);

    /* Hero dark: near-black charcoal + warm fire ember blobs (very subtle) */
    --gradient-hero:
        radial-gradient(circle at 14% 22%, rgba(255, 106, 0, 0.22) 0%, transparent 46%),
        radial-gradient(circle at 82% 14%, rgba(255, 138, 0, 0.14) 0%, transparent 40%),
        radial-gradient(circle at 52% 92%, rgba(255, 59, 0, 0.16) 0%, transparent 50%),
        linear-gradient(135deg, #060608 0%, #0e0f11 38%, #15161a 72%, #0a0a0c 100%);

    --gradient-dark-deep: linear-gradient(180deg,
        var(--charcoal-950) 0%,
        var(--charcoal-900) 40%,
        #0f1014 100%);

    --gradient-card-dark: linear-gradient(150deg,
        rgba(255, 255, 255, 0.05) 0%,
        rgba(255, 255, 255, 0.015) 100%);

    /* Premium signature border gradient: deep fire → ember → amber */
    --gradient-border-neon: linear-gradient(135deg,
        var(--fire-300) 0%,
        var(--fire-500) 48%,
        var(--fire-400) 100%);

    /* Primary BUTTON — Apple Buy style, deep ink + crisp drop shadow
       (deeper, darker than previous — matches user request) */
    --gradient-btn: linear-gradient(180deg,
        #2c2c2e 0%,
        #1d1d1f 100%);

    /* Section tag — warm fire tinted chip */
    --gradient-section-tag: linear-gradient(135deg,
        rgba(255, 138, 0, 0.10) 0%,
        rgba(255, 106, 0, 0.14) 100%);

    /* ══════════════════════════════════════
       Shadows — Apple crisp, low-saturation
       ══════════════════════════════════════ */
    --shadow-xs: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 6px 16px rgba(0, 0, 0, 0.07);
    --shadow-md: 0 14px 40px rgba(0, 0, 0, 0.10);
    --shadow-lg: 0 28px 72px rgba(0, 0, 0, 0.16);
    --shadow-card-hover: 0 24px 60px -18px rgba(0, 0, 0, 0.22);

    /* Deep primary button shadow — Apple "Buy" crisp dark drop
       (Deeper & sharper than previous neon glow — matches user "再深一点") */
    --glow-primary:
        inset 0 1px 0 rgba(255, 255, 255, 0.10),
        0 8px 20px rgba(0, 0, 0, 0.32),
        0 2px 6px rgba(0, 0, 0, 0.18);

    /* Soft fire accent glow — used only for signature badges/logo hover */
    --glow-fire:
        0 0 0 1px rgba(255, 106, 0, 0.35),
        0 10px 34px rgba(255, 106, 0, 0.30);

    /* Layout */
    --container: 1240px;
    --radius: 18px;
    --radius-sm: 12px;
    --radius-lg: 28px;
    --transition: 0.4s cubic-bezier(0.22, 1, 0.36, 1);
    --transition-slow: 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text);
    background: var(--silver-50);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

ul {
    list-style: none;
}

/* ---------- Layout helpers ---------- */
.container {
    width: 100%;
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 28px;
}

.section-head {
    text-align: center;
    max-width: 760px;
    margin: 0 auto 72px;
}

.section-head-light .section-title,
.section-head-light .section-desc {
    color: var(--text-on-dark);
}

.section-head-light .section-desc {
    color: var(--text-on-dark-muted);
}

.section-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: #b2baff;
    background: var(--gradient-section-tag);
    padding: 7px 18px;
    border-radius: 50px;
    margin-bottom: 22px;
    border: 1px solid rgba(125, 122, 255, 0.35);
    backdrop-filter: blur(6px);
}

.section-tag::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--cyan-400);
    box-shadow: 0 0 10px var(--cyan-400);
}

.section-title {
    font-family: 'Space Grotesk', sans-serif;
    font-size: clamp(2rem, 3.8vw, 3rem);
    font-weight: 700;
    line-height: 1.12;
    letter-spacing: -0.025em;
    margin-bottom: 20px;
    color: var(--ink-900);
}

.section-desc {
    font-size: 1.05rem;
    color: var(--text-muted);
    line-height: 1.8;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 2px 14px rgba(125, 122, 255, 0.25));
}

/* ---------- Buttons — Premium Tech System ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-family: 'Inter', sans-serif;
    font-size: 0.95rem;
    font-weight: 600;
    padding: 14px 30px;
    border-radius: 50px;
    border: 1px solid transparent;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
    position: relative;
    z-index: 1;
    letter-spacing: 0.01em;
}

.btn::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    opacity: 0;
    transition: opacity var(--transition);
    pointer-events: none;
}

.btn-small {
    padding: 11px 22px;
    font-size: 0.9rem;
}

.btn-block {
    width: 100%;
}

/* Primary — neon gradient, glow */
.btn-primary {
    background: var(--gradient-btn);
    color: #070d22;
    box-shadow: var(--glow-primary);
    background-size: 200% 200%;
    animation: gradientShift 8s ease infinite;
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50%      { background-position: 100% 50%; }
}

.btn-primary:hover {
    transform: translateY(-4px) scale(1.01);
    box-shadow: 0 0 0 1px rgba(125, 122, 255, 0.5),
                0 22px 54px -10px rgba(99, 91, 255, 0.7),
                0 0 90px -12px rgba(77, 233, 255, 0.5);
}

/* Ghost — glass + neon border */
.btn-ghost {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-on-dark);
    border: 1px solid rgba(125, 122, 255, 0.4);
    backdrop-filter: blur(14px);
}

.btn-ghost::before {
    background: linear-gradient(135deg,
        rgba(77, 233, 255, 0.15),
        rgba(196, 107, 255, 0.18));
}

.btn-ghost:hover {
    color: #fff;
    border-color: rgba(77, 233, 255, 0.7);
    transform: translateY(-4px);
    box-shadow: 0 16px 40px -10px rgba(99, 91, 255, 0.55);
}

.btn-ghost:hover::before {
    opacity: 1;
}

/* Nav CTA button */
.btn-nav {
    padding: 10px 24px;
    font-size: 0.88rem;
    background: var(--gradient-btn);
    color: #070d22;
    box-shadow: 0 6px 22px rgba(99, 91, 255, 0.45),
                0 0 30px -6px rgba(77, 233, 255, 0.35);
    background-size: 200% 200%;
    animation: gradientShift 9s ease infinite;
}

.btn-nav:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 28px rgba(99, 91, 255, 0.6),
                0 0 44px -6px rgba(77, 233, 255, 0.5);
}

/* ---------- Navigation — Premium Aurora ---------- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 22px 0;
    transition: var(--transition);
    background: transparent;
}

.navbar.scrolled {
    padding: 14px 0;
    background: rgba(7, 13, 34, 0.78);
    backdrop-filter: blur(22px) saturate(1.4);
    -webkit-backdrop-filter: blur(22px) saturate(1.4);
    border-bottom: 1px solid rgba(125, 122, 255, 0.18);
    box-shadow: 0 10px 40px rgba(4, 8, 20, 0.5);
}

.nav-container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 28px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 28px;
}

/* ══════════════════════════════════════
   NEW LOGO — Circuit HD Mark
   "Huodian" = Fire Point → glowing circuit node
   ══════════════════════════════════════ */
.nav-logo {
    display: flex;
    align-items: center;
    gap: 14px;
    font-family: 'Space Grotesk', sans-serif;
    color: var(--white);
}

.logo-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 12px;
    position: relative;
    background: radial-gradient(circle at 30% 30%,
                rgba(77, 233, 255, 0.22) 0%,
                rgba(99, 91, 255, 0.35) 45%,
                rgba(196, 107, 255, 0.18) 100%);
    border: 1px solid rgba(125, 122, 255, 0.55);
    box-shadow:
        inset 0 0 16px rgba(77, 233, 255, 0.25),
        0 6px 22px rgba(99, 91, 255, 0.45);
    overflow: hidden;
}

.logo-mark::before {
    content: '';
    position: absolute;
    inset: -2px;
    background: var(--gradient-border-neon);
    border-radius: inherit;
    opacity: 0.6;
    z-index: -1;
    filter: blur(8px);
    animation: logoGlow 5s ease-in-out infinite;
}

@keyframes logoGlow {
    0%, 100% { opacity: 0.45; filter: blur(8px); }
    50%      { opacity: 0.85; filter: blur(12px); }
}

.logo-mark svg {
    width: 26px;
    height: 26px;
    filter: drop-shadow(0 1px 3px rgba(0,0,0,0.4));
}

/* Fire-point (Huodian) pulse dot in corner of mark */
.logo-mark::after {
    content: '';
    position: absolute;
    top: 7px;
    right: 7px;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--cyan-400);
    box-shadow:
        0 0 6px var(--cyan-400),
        0 0 14px rgba(77, 233, 255, 0.9);
    animation: firePulse 2.4s ease-in-out infinite;
}

@keyframes firePulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
        box-shadow:
            0 0 6px var(--cyan-400),
            0 0 14px rgba(77, 233, 255, 0.9);
    }
    50% {
        transform: scale(1.5);
        opacity: 0.85;
        box-shadow:
            0 0 10px #fff,
            0 0 22px var(--cyan-400),
            0 0 36px rgba(196, 107, 255, 0.8);
    }
}

.logo-text {
    display: flex;
    flex-direction: column;
    line-height: 1.05;
    font-weight: 700;
}

.logo-main {
    font-size: 1.28rem;
    letter-spacing: -0.01em;
    background: linear-gradient(135deg, #fff 0%, #c9cfff 40%, #8ef0ff 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo-sub {
    font-size: 0.62rem;
    font-weight: 500;
    letter-spacing: 0.36em;
    text-transform: uppercase;
    color: var(--cyan-300);
    margin-top: 3px;
    opacity: 0.92;
}

.logo-accent {
    color: var(--cyan-400);
    -webkit-text-fill-color: var(--cyan-400);
}

/* Nav items */
.nav-menu {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-left: auto;
}

.nav-link {
    font-size: 0.9rem;
    font-weight: 500;
    color: rgba(232, 236, 255, 0.82);
    padding: 9px 16px;
    border-radius: 10px;
    transition: var(--transition);
    position: relative;
}

.nav-link:hover {
    color: #fff;
    background: rgba(125, 122, 255, 0.12);
}

.nav-link.active {
    color: #fff;
    background: rgba(125, 122, 255, 0.16);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background: var(--gradient-border-neon);
    border-radius: 2px;
    box-shadow: 0 0 8px rgba(77, 233, 255, 0.8);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: #fff;
    border-radius: 2px;
    transition: var(--transition);
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}
.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}
.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* ---------- Hero — Premium Deep-Space ---------- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    padding: 140px 0 100px;
    isolation: isolate;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: var(--gradient-hero);
    z-index: -3;
}

/* Circuit / hexagonal grid overlay */
.hero-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(125, 122, 255, 0.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(125, 122, 255, 0.06) 1px, transparent 1px);
    background-size: 56px 56px;
    mask-image: radial-gradient(ellipse at 50% 40%, black 10%, transparent 82%);
    -webkit-mask-image: radial-gradient(ellipse at 50% 40%, black 10%, transparent 82%);
}

/* Scanning line sweep */
.hero-bg::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    top: -10%;
    height: 30%;
    background: linear-gradient(180deg,
        transparent 0%,
        rgba(77, 233, 255, 0.07) 50%,
        transparent 100%);
    filter: blur(20px);
    animation: scanSweep 8s linear infinite;
    pointer-events: none;
}

@keyframes scanSweep {
    0%   { transform: translateY(-10%); opacity: 0; }
    15%  { opacity: 1; }
    85%  { opacity: 1; }
    100% { transform: translateY(400%); opacity: 0; }
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 50% 120%,
                rgba(7, 13, 34, 0) 0%,
                rgba(7, 13, 34, 0.6) 70%);
    z-index: -2;
}

/* Floating circuit-orbs (particles upgrade) */
.hero-particles {
    position: absolute;
    inset: 0;
    overflow: hidden;
    z-index: -1;
    pointer-events: none;
}

.hero-particles span {
    position: absolute;
    display: block;
    width: 6px;
    height: 6px;
    background: var(--cyan-400);
    border-radius: 50%;
    opacity: 0;
    box-shadow:
        0 0 8px var(--cyan-400),
        0 0 18px rgba(77, 233, 255, 0.7);
    animation: floatOrb 14s linear infinite;
}

.hero-particles span:nth-child(1) {
    left: 8%;
    width: 4px; height: 4px;
    animation-delay: 0s;
}
.hero-particles span:nth-child(2) {
    left: 22%;
    background: var(--violet-500);
    box-shadow: 0 0 8px var(--violet-500), 0 0 18px rgba(125, 122, 255, 0.8);
    animation-delay: 3s;
}
.hero-particles span:nth-child(3) {
    left: 40%;
    width: 5px; height: 5px;
    background: #c46bff;
    box-shadow: 0 0 8px #c46bff, 0 0 18px rgba(196, 107, 255, 0.7);
    animation-delay: 6s;
}
.hero-particles span:nth-child(4) {
    left: 60%;
    animation-delay: 1.5s;
}
.hero-particles span:nth-child(5) {
    left: 78%;
    width: 3px; height: 3px;
    background: var(--aurora);
    box-shadow: 0 0 6px var(--aurora), 0 0 14px rgba(37, 244, 217, 0.7);
    animation-delay: 5s;
}
.hero-particles span:nth-child(6) {
    left: 92%;
    width: 5px; height: 5px;
    background: var(--violet-400);
    box-shadow: 0 0 8px var(--violet-400), 0 0 18px rgba(160, 140, 255, 0.8);
    animation-delay: 9s;
}

@keyframes floatOrb {
    0%   { transform: translateY(10vh) scale(0.6); opacity: 0; }
    10%  { opacity: 0.95; }
    90%  { opacity: 0.7; }
    100% { transform: translateY(-110vh) scale(1.1); opacity: 0; }
}

/* Aurora ring behind hero content */
.hero::before {
    content: '';
    position: absolute;
    top: 28%;
    right: -8%;
    width: 600px;
    height: 600px;
    background:
        radial-gradient(circle at center,
          rgba(77, 233, 255, 0.14) 0%,
          rgba(99, 91, 255, 0.10) 35%,
          transparent 70%);
    border-radius: 50%;
    filter: blur(40px);
    z-index: -1;
    animation: auroraFloat 12s ease-in-out infinite alternate;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: 12%;
    left: -10%;
    width: 480px;
    height: 480px;
    background:
        radial-gradient(circle at center,
          rgba(196, 107, 255, 0.14) 0%,
          rgba(99, 91, 255, 0.08) 40%,
          transparent 72%);
    border-radius: 50%;
    filter: blur(40px);
    z-index: -1;
    animation: auroraFloat 15s ease-in-out infinite alternate-reverse;
}

@keyframes auroraFloat {
    0%   { transform: translate(0, 0) scale(1); }
    100% { transform: translate(-4%, 3%) scale(1.08); }
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero-text {
    max-width: 860px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 0.82rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    color: var(--cyan-300);
    background: linear-gradient(135deg,
        rgba(77, 233, 255, 0.09) 0%,
        rgba(125, 122, 255, 0.12) 100%);
    border: 1px solid rgba(125, 122, 255, 0.35);
    padding: 8px 20px;
    border-radius: 50px;
    margin-bottom: 32px;
    backdrop-filter: blur(10px);
}

.hero-badge::before {
    content: '';
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--aurora);
    box-shadow: 0 0 8px var(--aurora);
    animation: firePulse 2.2s ease-in-out infinite;
}

.hero-title {
    font-family: 'Space Grotesk', sans-serif;
    font-size: clamp(2.5rem, 5.4vw, 4.4rem);
    font-weight: 700;
    line-height: 1.06;
    letter-spacing: -0.03em;
    color: #fff;
    margin-bottom: 28px;
}

.hero-title .gradient-text {
    filter: drop-shadow(0 4px 28px rgba(125, 122, 255, 0.45));
}

.hero-subtitle {
    font-size: 1.15rem;
    color: rgba(220, 228, 255, 0.78);
    max-width: 680px;
    margin-bottom: 44px;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 72px;
}

/* Premium glass-morphism stat panel */
.hero-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
    padding: 28px;
    background:
        linear-gradient(rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.02)) padding-box,
        var(--gradient-border-neon) border-box;
    border: 1px solid transparent;
    border-radius: var(--radius-lg);
    backdrop-filter: blur(22px) saturate(1.3);
    -webkit-backdrop-filter: blur(22px) saturate(1.3);
    box-shadow: 0 20px 60px -20px rgba(99, 91, 255, 0.45),
                inset 0 1px 0 rgba(255, 255, 255, 0.06);
    position: relative;
    max-width: 820px;
}

.hero-stats::before {
    content: '';
    position: absolute;
    inset: -1px;
    border-radius: inherit;
    padding: 1px;
    background: var(--gradient-border-neon);
    -webkit-mask:
        linear-gradient(#fff 0 0) content-box,
        linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
            mask-composite: exclude;
    opacity: 0.8;
    pointer-events: none;
}

.hero-stat {
    display: flex;
    flex-direction: column;
    padding: 0 24px;
    border-right: 1px solid rgba(125, 122, 255, 0.18);
}

.hero-stat:last-child {
    border-right: none;
}

.hero-stat .stat-num {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 2.35rem;
    font-weight: 700;
    background: linear-gradient(180deg, #fff 0%, #8ef0ff 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1;
    display: inline;
}

.hero-stat .stat-plus {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 2.35rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1;
}

.hero-stat .stat-label {
    font-size: 0.82rem;
    color: rgba(200, 210, 255, 0.78);
    margin-top: 10px;
    letter-spacing: 0.04em;
    font-weight: 500;
}

.scroll-down {
    position: absolute;
    bottom: 28px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 3;
    animation: bounce 2.2s infinite;
}

.mouse {
    display: block;
    width: 28px;
    height: 44px;
    border: 1.5px solid rgba(125, 122, 255, 0.6);
    border-radius: 16px;
    position: relative;
    box-shadow: inset 0 0 10px rgba(77, 233, 255, 0.2);
}

.wheel {
    position: absolute;
    top: 9px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 9px;
    background: linear-gradient(180deg, var(--cyan-400), var(--violet-500));
    border-radius: 2px;
    animation: wheelMove 1.8s infinite;
    box-shadow: 0 0 6px var(--cyan-400);
}

@keyframes wheelMove {
    0%   { opacity: 1; top: 9px; }
    100% { opacity: 0; top: 24px; }
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50%      { transform: translateX(-50%) translateY(-10px); }
}

/* ---------- About — Premium Bright Section ---------- */
.about {
    padding: 140px 0;
    background:
        radial-gradient(circle at 100% 0%, rgba(99, 91, 255, 0.07) 0%, transparent 40%),
        radial-gradient(circle at 0% 100%, rgba(77, 233, 255, 0.06) 0%, transparent 40%),
        linear-gradient(180deg, var(--silver-50) 0%, #ffffff 100%);
    position: relative;
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1.1fr;
    gap: 80px;
    align-items: center;
}

.about-visual {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

/* Premium neon-frame card */
.about-visual::before {
    content: '';
    position: absolute;
    inset: 0;
    padding: 1.5px;
    border-radius: inherit;
    background: var(--gradient-border-neon);
    -webkit-mask:
        linear-gradient(#fff 0 0) content-box,
        linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
            mask-composite: exclude;
    z-index: 2;
    pointer-events: none;
    opacity: 0.75;
}

.about-visual::after {
    content: '';
    position: absolute;
    inset: -16px;
    background: var(--gradient-border-neon);
    border-radius: inherit;
    z-index: -1;
    opacity: 0.15;
    filter: blur(30px);
    transition: opacity var(--transition-slow);
}

.about-visual:hover::after {
    opacity: 0.3;
}

.about-visual img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    aspect-ratio: 4 / 3;
    transition: transform 1.1s cubic-bezier(0.22, 1, 0.36, 1);
}

.about-visual:hover img {
    transform: scale(1.06);
}

.about-badge {
    position: absolute;
    bottom: 26px;
    left: 26px;
    z-index: 3;
    background:
        linear-gradient(rgba(7, 13, 34, 0.88), rgba(7, 13, 34, 0.78)) padding-box,
        var(--gradient-border-neon) border-box;
    border: 1px solid transparent;
    backdrop-filter: blur(14px);
    border-radius: var(--radius);
    padding: 22px 26px;
    display: flex;
    align-items: center;
    gap: 16px;
    box-shadow: 0 16px 44px rgba(4, 8, 20, 0.6);
}

.badge-year {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 2.2rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1;
}

.badge-text {
    font-size: 0.88rem;
    color: rgba(232, 236, 255, 0.9);
    line-height: 1.35;
    font-weight: 500;
}

.about-text h3 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.85rem;
    font-weight: 700;
    color: var(--ink-900);
    margin-bottom: 22px;
    letter-spacing: -0.015em;
}

.about-text p {
    color: var(--slate-600);
    margin-bottom: 18px;
    line-height: 1.85;
}

.about-list {
    margin: 32px 0 36px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.about-list li {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    color: var(--ink-800);
    font-size: 0.98rem;
}

.check {
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    border-radius: 8px;
    background: var(--gradient-btn);
    color: #fff;
    font-size: 0.78rem;
    font-weight: 700;
    margin-top: 2px;
    box-shadow: 0 4px 12px rgba(99, 91, 255, 0.35);
}

/* ---------- Products — Premium ---------- */
.products {
    padding: 140px 0;
    background:
        radial-gradient(circle at 0% 0%, rgba(99, 91, 255, 0.06) 0%, transparent 45%),
        linear-gradient(180deg, #ffffff 0%, var(--silver-50) 100%);
    position: relative;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 26px;
}

.product-card {
    background: #fff;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-slow);
    position: relative;
    border: 1px solid rgba(125, 122, 255, 0.08);
    display: flex;
    flex-direction: column;
}

/* Premium gradient-border wrapper (via pseudo element) */
.product-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    padding: 1.5px;
    background: var(--gradient-border-neon);
    -webkit-mask:
        linear-gradient(#fff 0 0) content-box,
        linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
            mask-composite: exclude;
    opacity: 0;
    transition: opacity var(--transition);
    z-index: 3;
    pointer-events: none;
}

.product-card:hover {
    transform: translateY(-12px);
    box-shadow: var(--shadow-card-hover);
    border-color: transparent;
}

.product-card:hover::before {
    opacity: 1;
}

.product-img {
    overflow: hidden;
    aspect-ratio: 1 / 1;
    background: var(--gradient-dark-deep);
    position: relative;
}

.product-img::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg,
        transparent 55%,
        rgba(7, 13, 34, 0.35) 100%);
    opacity: 0;
    transition: opacity var(--transition);
    pointer-events: none;
}

.product-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.9s cubic-bezier(0.22, 1, 0.36, 1), filter 0.6s ease;
}

.product-card:hover .product-img img {
    transform: scale(1.1);
    filter: saturate(1.1) contrast(1.03);
}

.product-body {
    padding: 28px 26px 30px;
    position: relative;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.product-num {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.76rem;
    font-weight: 700;
    letter-spacing: 0.22em;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.product-body h3 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.26rem;
    font-weight: 700;
    color: var(--ink-900);
    margin: 10px 0 14px;
    letter-spacing: -0.01em;
}

.product-body p {
    font-size: 0.93rem;
    color: var(--slate-500);
    line-height: 1.75;
    margin-bottom: 20px;
    flex: 1;
}

.product-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.product-tags li {
    font-size: 0.76rem;
    font-weight: 500;
    color: var(--royal-700);
    background: linear-gradient(135deg,
        rgba(77, 233, 255, 0.08) 0%,
        rgba(125, 122, 255, 0.12) 100%);
    padding: 5px 13px;
    border-radius: 50px;
    border: 1px solid rgba(125, 122, 255, 0.2);
    transition: var(--transition);
}

.product-card:hover .product-tags li {
    background: linear-gradient(135deg,
        rgba(77, 233, 255, 0.15) 0%,
        rgba(125, 122, 255, 0.22) 100%);
    color: var(--ink-800);
    transform: translateY(-1px);
}

/* Premium dark CTA banner */
.products-cta {
    text-align: center;
    margin-top: 64px;
    padding: 52px 40px;
    background: var(--gradient-dark-deep);
    border-radius: var(--radius-lg);
    color: #fff;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 22px;
    position: relative;
    overflow: hidden;
}

.products-cta::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 18% 50%, rgba(77, 233, 255, 0.25), transparent 45%),
        radial-gradient(circle at 82% 50%, rgba(196, 107, 255, 0.22), transparent 45%);
    opacity: 0.9;
}

.products-cta::after {
    content: '';
    position: absolute;
    inset: 0;
    padding: 1.5px;
    border-radius: inherit;
    background: var(--gradient-border-neon);
    -webkit-mask:
        linear-gradient(#fff 0 0) content-box,
        linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
            mask-composite: exclude;
    pointer-events: none;
}

.products-cta p {
    position: relative;
    font-size: 1.15rem;
    font-weight: 500;
    color: rgba(232, 236, 255, 0.92);
}

.products-cta .btn {
    position: relative;
    padding: 15px 36px;
}

/* ---------- Advantages — Deep Dark Premium ---------- */
.advantages {
    padding: 140px 0;
    background: var(--gradient-dark-deep);
    position: relative;
    overflow: hidden;
    isolation: isolate;
}

.advantages::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(125, 122, 255, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(125, 122, 255, 0.05) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at 50% 40%, black 5%, transparent 80%);
    -webkit-mask-image: radial-gradient(ellipse at 50% 40%, black 5%, transparent 80%);
    z-index: -1;
}

.advantages::after {
    content: '';
    position: absolute;
    top: -10%;
    left: 50%;
    transform: translateX(-50%);
    width: 900px;
    height: 900px;
    background: radial-gradient(circle at center,
                rgba(99, 91, 255, 0.14) 0%,
                rgba(77, 233, 255, 0.06) 35%,
                transparent 70%);
    border-radius: 50%;
    z-index: -1;
    filter: blur(40px);
}

.adv-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    position: relative;
    z-index: 1;
}

.adv-card {
    background:
        linear-gradient(150deg,
          rgba(255, 255, 255, 0.045) 0%,
          rgba(255, 255, 255, 0.015) 100%) padding-box,
        var(--gradient-border-neon) border-box;
    border: 1px solid transparent;
    border-radius: var(--radius);
    padding: 40px 32px;
    transition: var(--transition-slow);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    position: relative;
    overflow: hidden;
}

.adv-card::before {
    content: '';
    position: absolute;
    top: -40%;
    right: -20%;
    width: 240px;
    height: 240px;
    background: radial-gradient(circle,
                rgba(99, 91, 255, 0.18) 0%,
                transparent 70%);
    opacity: 0;
    transition: opacity var(--transition-slow);
    pointer-events: none;
}

.adv-card:hover {
    transform: translateY(-8px);
    background:
        linear-gradient(150deg,
          rgba(255, 255, 255, 0.065) 0%,
          rgba(255, 255, 255, 0.02) 100%) padding-box,
        var(--gradient-border-neon) border-box;
    border-color: transparent;
    box-shadow:
        0 20px 60px -18px rgba(99, 91, 255, 0.5),
        0 0 60px -20px rgba(77, 233, 255, 0.3);
}

.adv-card:hover::before {
    opacity: 1;
}

.adv-icon {
    width: 62px;
    height: 62px;
    border-radius: 18px;
    background:
        radial-gradient(circle at 30% 30%,
          rgba(77, 233, 255, 0.25) 0%,
          rgba(99, 91, 255, 0.3) 50%,
          rgba(196, 107, 255, 0.15) 100%);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 26px;
    position: relative;
    border: 1px solid rgba(125, 122, 255, 0.45);
    box-shadow:
        inset 0 0 18px rgba(77, 233, 255, 0.2),
        0 10px 28px rgba(99, 91, 255, 0.4);
}

.adv-icon::after {
    content: '';
    position: absolute;
    inset: -2px;
    border-radius: inherit;
    background: var(--gradient-border-neon);
    opacity: 0.5;
    z-index: -1;
    filter: blur(6px);
    transition: opacity var(--transition);
}

.adv-card:hover .adv-icon::after {
    opacity: 0.9;
}

.adv-icon svg {
    width: 30px;
    height: 30px;
}

.adv-card h3 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.24rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 12px;
    position: relative;
}

.adv-card p {
    color: rgba(200, 210, 255, 0.72);
    font-size: 0.94rem;
    line-height: 1.8;
    position: relative;
}

/* ---------- Process ---------- */
.process {
    padding: 120px 0;
    background: #fff;
    position: relative;
}

.process-grid {
    display: grid;
    grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr;
    gap: 16px;
    align-items: stretch;
}

.process-item {
    text-align: center;
    padding: 36px 26px;
    background: var(--silver-50);
    border-radius: var(--radius);
    border: 1px solid rgba(125, 122, 255, 0.12);
    transition: var(--transition-slow);
    position: relative;
    overflow: hidden;
}

.process-item::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    padding: 1.5px;
    background: var(--gradient-border-neon);
    -webkit-mask:
        linear-gradient(#fff 0 0) content-box,
        linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
            mask-composite: exclude;
    opacity: 0;
    transition: opacity var(--transition);
}

.process-item:hover {
    background: #fff;
    box-shadow: var(--shadow-md);
    transform: translateY(-6px);
    border-color: transparent;
}

.process-item:hover::before {
    opacity: 1;
}

.process-step {
    display: inline-block;
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.6rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 16px;
}

.process-item h4 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.08rem;
    font-weight: 600;
    color: var(--ink-900);
    margin-bottom: 10px;
}

.process-item p {
    font-size: 0.88rem;
    color: var(--slate-500);
    line-height: 1.7;
}

.process-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 400;
}

/* ---------- Contact ---------- */
.contact {
    padding: 140px 0;
    background:
        radial-gradient(circle at 100% 100%, rgba(77, 233, 255, 0.06) 0%, transparent 40%),
        var(--silver-50);
}

.contact-wrap {
    display: grid;
    grid-template-columns: 1fr 1.1fr;
    gap: 72px;
    align-items: start;
}

.contact-info .section-tag,
.contact-info .section-title,
.contact-info .section-desc {
    text-align: left;
}

.contact-info .section-title {
    margin-bottom: 18px;
}

.contact-list {
    margin-top: 40px;
    display: flex;
    flex-direction: column;
    gap: 26px;
}

.contact-list li {
    display: flex;
    align-items: center;
    gap: 18px;
    padding: 18px 20px;
    background: #fff;
    border-radius: var(--radius);
    border: 1px solid rgba(125, 122, 255, 0.1);
    transition: var(--transition);
    box-shadow: var(--shadow-xs);
}

.contact-list li:hover {
    transform: translateX(6px);
    box-shadow: var(--shadow-sm),
                0 0 0 1px rgba(125, 122, 255, 0.2);
    border-color: transparent;
}

.ci-icon {
    flex-shrink: 0;
    width: 54px;
    height: 54px;
    border-radius: 16px;
    background: var(--gradient-btn);
    color: #070d22;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 22px rgba(99, 91, 255, 0.38),
                0 0 30px -6px rgba(77, 233, 255, 0.3);
}

.ci-icon svg {
    width: 24px;
    height: 24px;
}

.ci-label {
    display: block;
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--slate-500);
    margin-bottom: 4px;
    font-weight: 600;
}

.ci-value {
    display: block;
    font-size: 1rem;
    font-weight: 600;
    color: var(--ink-900);
    word-break: break-word;
}

.contact-form {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 44px;
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(125, 122, 255, 0.1);
    position: relative;
    overflow: hidden;
}

.contact-form::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-border-neon);
}

.contact-form h3 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--ink-900);
    margin-bottom: 28px;
    letter-spacing: -0.015em;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
}

.form-group {
    margin-bottom: 22px;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--ink-700);
    margin-bottom: 9px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    font-family: inherit;
    font-size: 0.95rem;
    color: var(--text);
    background: var(--silver-50);
    border: 1.5px solid rgba(125, 122, 255, 0.15);
    border-radius: var(--radius-sm);
    padding: 13px 16px;
    transition: var(--transition);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--slate-400);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--violet-500);
    background: #fff;
    box-shadow: 0 0 0 4px rgba(125, 122, 255, 0.15),
                0 0 18px -4px rgba(77, 233, 255, 0.25);
}

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

.form-note {
    margin-top: 16px;
    font-size: 0.88rem;
    text-align: center;
    min-height: 22px;
    transition: var(--transition);
}

.form-note.success {
    color: #047857;
    background: rgba(37, 244, 217, 0.1);
    padding: 10px;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(37, 244, 217, 0.3);
}

.form-note.error {
    color: #b91c1c;
    background: rgba(239, 68, 68, 0.08);
    padding: 10px;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

/* ---------- Footer — Premium Dark ---------- */
.footer {
    background:
        radial-gradient(circle at 50% 0%, rgba(99, 91, 255, 0.18) 0%, transparent 50%),
        linear-gradient(180deg, #070d22 0%, #040814 100%);
    color: rgba(220, 228, 255, 0.72);
    padding: 90px 0 0;
    position: relative;
    overflow: hidden;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg,
        transparent 0%,
        rgba(125, 122, 255, 0.6) 30%,
        rgba(77, 233, 255, 0.6) 50%,
        rgba(196, 107, 255, 0.6) 70%,
        transparent 100%);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.6fr 1fr 1fr 1.3fr;
    gap: 48px;
    padding-bottom: 60px;
    border-bottom: 1px solid rgba(125, 122, 255, 0.12);
}

.footer-brand .nav-logo {
    margin-bottom: 22px;
}

.footer-brand p {
    font-size: 0.92rem;
    line-height: 1.8;
    max-width: 340px;
    color: rgba(200, 210, 255, 0.68);
}

.footer-col h5 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1rem;
    font-weight: 600;
    color: #fff;
    margin-bottom: 22px;
    letter-spacing: 0.02em;
}

.footer-col ul {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.footer-col li {
    font-size: 0.9rem;
    color: rgba(200, 210, 255, 0.68);
    line-height: 1.6;
}

.footer-col a {
    transition: var(--transition);
    position: relative;
}

.footer-col a::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -2px;
    width: 0;
    height: 1px;
    background: var(--gradient-border-neon);
    transition: width var(--transition);
}

.footer-col a:hover {
    color: #fff;
}

.footer-col a:hover::after {
    width: 100%;
}

.footer-bottom {
    padding: 28px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 0.85rem;
    color: rgba(200, 210, 255, 0.55);
}

.footer-tagline {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 600;
    letter-spacing: 0.02em;
}

/* ---------- Back to top ---------- */
.back-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--gradient-btn);
    color: #070d22;
    border: none;
    font-size: 1.3rem;
    font-weight: 700;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
    box-shadow: var(--glow-primary);
    background-size: 200% 200%;
    animation: gradientShift 7s ease infinite;
    z-index: 900;
}

.back-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-top:hover {
    transform: translateY(-5px) scale(1.05);
}

/* ---------- Reveal animations (disabled — show immediately) ---------- */
.reveal {
    opacity: 1;
    transform: none;
    transition: none;
}

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

/* ============================================
   Responsive — Premium Tech
   ============================================ */
@media (max-width: 1080px) {
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .adv-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .process-grid {
        grid-template-columns: 1fr auto 1fr;
        grid-template-rows: auto auto;
        row-gap: 24px;
    }
    .process-arrow:nth-of-type(2),
    .process-arrow:nth-of-type(4) {
        display: none;
    }
    .process-arrow {
        transform: rotate(90deg);
    }
}

@media (max-width: 880px) {
    .nav-menu,
    .btn-nav {
        display: none;
    }
    .nav-toggle {
        display: flex;
    }
    .nav-menu.mobile-open {
        display: flex;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: stretch;
        background:
            linear-gradient(rgba(7, 13, 34, 0.96), rgba(4, 8, 20, 0.98)) padding-box,
            var(--gradient-border-neon) border-box;
        border-top: 1px solid rgba(125, 122, 255, 0.2);
        border-bottom: 1px solid transparent;
        padding: 18px;
        gap: 4px;
        backdrop-filter: blur(24px) saturate(1.4);
    }
    .nav-menu.mobile-open .nav-link {
        padding: 14px 18px;
        width: 100%;
        text-align: center;
    }

    .about-grid,
    .contact-wrap {
        grid-template-columns: 1fr;
        gap: 56px;
    }

    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
        padding: 22px;
    }
    .hero-stat {
        padding: 12px 16px;
        border-right: none;
        border-bottom: 1px solid rgba(125, 122, 255, 0.18);
    }
    .hero-stat:nth-child(3),
    .hero-stat:nth-child(4) {
        border-bottom: none;
    }
    .hero-stat:nth-child(1),
    .hero-stat:nth-child(3) {
        border-right: 1px solid rgba(125, 122, 255, 0.18);
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 40px;
    }

    .section-head {
        margin-bottom: 56px;
    }
    .about,
    .products,
    .advantages,
    .contact,
    .process {
        padding: 88px 0;
    }
}

@media (max-width: 580px) {
    .container,
    .nav-container {
        padding: 0 20px;
    }
    .products-grid,
    .adv-grid {
        grid-template-columns: 1fr;
    }
    .form-row {
        grid-template-columns: 1fr;
        gap: 0;
    }
    .footer-grid {
        grid-template-columns: 1fr;
    }
    .process-grid {
        grid-template-columns: 1fr;
    }
    .process-arrow {
        display: none;
    }
    .hero-actions {
        flex-direction: column;
    }
    .hero-actions .btn {
        width: 100%;
    }
    .contact-form {
        padding: 30px 22px;
    }
    .footer-bottom {
        flex-direction: column;
        text-align: center;
        gap: 8px;
    }
    .hero-stats {
        grid-template-columns: 1fr;
    }
    .hero-stat {
        border-right: none !important;
        padding: 14px 8px;
    }
    .products-cta {
        padding: 40px 22px;
    }
}

@media (max-width: 380px) {
    .hero-stat {
        border-right: none !important;
    }
}