/* ==========================================================================
   FASTI Machinery — Official Website Stylesheet
   Design: Dark Industrial Premium Theme
   ========================================================================== */

/* ==================== Custom Properties ==================== */
:root {
    /* Color Palette */
    --c-bg:           #0a0e1a;
    --c-bg-2:         #0f1424;
    --c-bg-3:         #161b30;
    --c-surface:      rgba(255,255,255,0.03);
    --c-surface-h:   rgba(255,255,255,0.06);
    --c-border:      rgba(255,255,255,0.08);
    --c-border-h:    rgba(255,107,53,0.3);

    --c-accent:      #ff6b35;
    --c-accent-l:    #ff8c5a;
    --c-accent-d:    #e55a2b;
    --c-accent-glow: rgba(255,107,53,0.15);

    --c-blue:        #3b9eff;
    --c-blue-glow:   rgba(59,158,255,0.1);

    --c-text:        #f0f4ff;
    --c-text-2:      #94a3b8;
    --c-text-3:      #64748b;

    --c-success:     #22c55e;
    --c-gradient:    linear-gradient(135deg, #ff6b35 0%, #ff9558 100%);
    --c-gradient-d:  linear-gradient(135deg, #e55a2b 0%, #ff7a40 100%);

    /* Typography */
    --font: 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', 'JetBrains Mono', monospace;

    /* Spacing */
    --container: 1280px;
    --section-pad: clamp(64px, 10vw, 120px);
    --container-pad: clamp(20px, 5vw, 48px);

    /* Transitions */
    --t: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    --t-slow: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    --t-fast: all 0.2s ease;

    /* Shadows */
    --shadow-card: 0 4px 24px rgba(0,0,0,0.3);
    --shadow-hover: 0 12px 48px rgba(0,0,0,0.4), 0 0 24px var(--c-accent-glow);
}

/* ==================== Reset ==================== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
    font-family: var(--font);
    background: var(--c-bg);
    color: var(--c-text);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
button { border: none; background: none; cursor: pointer; font-family: inherit; }
input, textarea, select { font-family: inherit; }

/* Scrollbar */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--c-bg); }
::-webkit-scrollbar-thumb { background: var(--c-bg-3); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--c-accent-d); }

/* Selection */
::selection { background: var(--c-accent); color: #fff; }

/* ==================== Utilities ==================== */
.container { max-width: var(--container); margin: 0 auto; padding: 0 var(--container-pad); }
.section { padding: var(--section-pad) 0; position: relative; }
.section:nth-child(even) { background: var(--c-bg-2); }

.section-header { text-align: center; margin-bottom: 64px; }
.section-tag {
    display: inline-block;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.2em;
    color: var(--c-accent);
    text-transform: uppercase;
    margin-bottom: 16px;
    padding: 6px 20px;
    background: var(--c-accent-glow);
    border-radius: 100px;
    border: 1px solid rgba(255,107,53,0.2);
}
.section-title {
    font-size: clamp(28px, 4vw, 44px);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 20px;
    background: linear-gradient(180deg, #fff 0%, #94a3b8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.section-line {
    width: 48px;
    height: 3px;
    background: var(--c-gradient);
    border-radius: 2px;
    margin: 0 auto 20px;
}
.section-desc { color: var(--c-text-2); font-size: clamp(14px, 1.5vw, 17px); max-width: 600px; margin: 0 auto; }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 100px;
    font-size: 15px;
    font-weight: 600;
    transition: var(--t);
    cursor: pointer;
    white-space: nowrap;
}
.btn-primary {
    background: var(--c-gradient);
    color: #fff;
    box-shadow: 0 4px 20px var(--c-accent-glow);
}
.btn-primary:hover {
    background: var(--c-gradient-d);
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(255,107,53,0.3);
}
.btn-ghost {
    background: transparent;
    color: var(--c-text);
    border: 1px solid var(--c-border);
}
.btn-ghost:hover {
    background: var(--c-surface-h);
    border-color: var(--c-border-h);
    transform: translateY(-2px);
}
.btn-full { width: 100%; justify-content: center; }

/* Reveal animation */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.active { opacity: 1; transform: translateY(0); }

/* ==================== Loader ==================== */
.loader {
    position: fixed;
    inset: 0;
    background: var(--c-bg);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}
.loader.hidden { opacity: 0; visibility: hidden; }
.loader-inner { text-align: center; }
.loader-logo { position: relative; display: inline-block; }
.loader-text {
    font-size: 42px;
    font-weight: 800;
    letter-spacing: 0.15em;
    color: var(--c-text);
    display: block;
    margin-bottom: 16px;
}
.loader-bar {
    width: 0;
    height: 2px;
    background: var(--c-gradient);
    border-radius: 1px;
    animation: loaderBar 1.5s ease-in-out forwards;
}
.loader-subtitle {
    margin-top: 16px;
    font-size: 14px;
    color: var(--c-text-2);
    letter-spacing: 0.1em;
    opacity: 0;
    animation: fadeIn 0.5s ease 0.8s forwards;
}
@keyframes loaderBar { to { width: 100%; } }
@keyframes fadeIn { to { opacity: 1; } }

/* ==================== Navigation ==================== */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    transition: var(--t);
    padding: 20px 0;
}
.navbar.scrolled {
    padding: 12px 0;
    background: rgba(10,14,26,0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--c-border);
}
.nav-container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 var(--container-pad);
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--c-text);
}
.logo-mark {
    color: var(--c-accent);
    display: flex;
    transition: var(--t);
}
.nav-logo:hover .logo-mark { transform: rotate(-8deg) scale(1.05); }
.logo-text { display: flex; flex-direction: column; line-height: 1.2; }
.logo-name { font-size: 20px; font-weight: 800; letter-spacing: 0.05em; }
.logo-cn { font-size: 11px; color: var(--c-text-2); letter-spacing: 0.15em; }

.nav-menu {
    display: flex;
    align-items: center;
    gap: 4px;
}
.nav-link {
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
    color: var(--c-text-2);
    border-radius: 8px;
    transition: var(--t-fast);
    position: relative;
}
.nav-link:hover { color: var(--c-text); background: var(--c-surface); }
.nav-link.active { color: var(--c-accent); }
.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px; height: 4px;
    background: var(--c-accent);
    border-radius: 50%;
}
.nav-cta {
    background: var(--c-gradient);
    color: #fff !important;
    padding: 10px 24px;
    margin-left: 8px;
    box-shadow: 0 2px 12px var(--c-accent-glow);
}
.nav-cta:hover { background: var(--c-gradient-d); transform: translateY(-1px); }
.nav-cta.active::after { display: none; }

.lang-toggle {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-left: 12px;
    padding: 8px 14px;
    border-radius: 100px;
    border: 1px solid var(--c-border);
    font-size: 12px;
    font-weight: 600;
    transition: var(--t-fast);
}
.lang-toggle:hover { border-color: var(--c-border-h); background: var(--c-surface); }
.lang-current { color: var(--c-accent); }
.lang-separator { color: var(--c-text-3); }
.lang-other { color: var(--c-text-2); }

.nav-burger {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
}
.nav-burger span {
    width: 24px; height: 2px;
    background: var(--c-text);
    border-radius: 2px;
    transition: var(--t);
}
.nav-burger.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-burger.open span:nth-child(2) { opacity: 0; }
.nav-burger.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ==================== Hero ==================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding-top: 80px;
}
.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}
.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, #000 30%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, #000 30%, transparent 70%);
}
.hero-glow {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    width: 800px; height: 800px;
    background: radial-gradient(circle, var(--c-accent-glow) 0%, transparent 70%);
    animation: glowPulse 6s ease-in-out infinite;
}
@keyframes glowPulse {
    0%, 100% { opacity: 0.5; transform: translate(-50%, -50%) scale(1); }
    50% { opacity: 0.8; transform: translate(-50%, -50%) scale(1.15); }
}
.hero-particles {
    position: absolute;
    inset: 0;
    overflow: hidden;
}
.particle {
    position: absolute;
    width: 4px; height: 4px;
    background: var(--c-accent);
    border-radius: 50%;
    opacity: 0.3;
    animation: floatUp linear infinite;
}
@keyframes floatUp {
    from { transform: translateY(100vh) translateX(0); opacity: 0; }
    10% { opacity: 0.4; }
    90% { opacity: 0.4; }
    to { transform: translateY(-100px) translateX(50px); opacity: 0; }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
    padding: 0 20px;
}
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: 100px;
    font-size: 13px;
    color: var(--c-text-2);
    margin-bottom: 32px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}
.badge-dot {
    width: 8px; height: 8px;
    background: var(--c-accent);
    border-radius: 50%;
    animation: dotPulse 2s ease-in-out infinite;
}
@keyframes dotPulse {
    0%, 100% { box-shadow: 0 0 0 0 var(--c-accent-glow); }
    50% { box-shadow: 0 0 0 8px transparent; }
}
.hero-title {
    font-size: clamp(40px, 6vw, 72px);
    font-weight: 900;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 24px;
}
.title-line { display: block; }
.title-accent {
    background: var(--c-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-subtitle {
    font-size: clamp(15px, 1.8vw, 19px);
    color: var(--c-text-2);
    line-height: 1.8;
    margin-bottom: 40px;
    max-width: 640px;
    margin-left: auto;
    margin-right: auto;
}
.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}
.hero-scroll {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--c-text-3);
    font-size: 12px;
    z-index: 1;
}
.scroll-mouse {
    width: 24px; height: 40px;
    border: 2px solid var(--c-text-3);
    border-radius: 12px;
    position: relative;
}
.scroll-wheel {
    position: absolute;
    top: 6px; left: 50%;
    transform: translateX(-50%);
    width: 4px; height: 8px;
    background: var(--c-accent);
    border-radius: 2px;
    animation: scrollWheel 2s ease-in-out infinite;
}
@keyframes scrollWheel {
    0% { opacity: 1; top: 6px; }
    100% { opacity: 0; top: 24px; }
}

/* ==================== Stats Bar ==================== */
.stats-bar {
    padding: 48px 0;
    background: var(--c-bg-2);
    border-top: 1px solid var(--c-border);
    border-bottom: 1px solid var(--c-border);
}
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    text-align: center;
}
.stat-item {
    position: relative;
    padding: 16px;
}
.stat-item::after {
    content: '';
    position: absolute;
    right: 0; top: 25%;
    height: 50%;
    width: 1px;
    background: var(--c-border);
}
.stat-item:last-child::after { display: none; }
.stat-number {
    font-size: clamp(32px, 4vw, 48px);
    font-weight: 900;
    color: var(--c-accent);
    display: inline-block;
    line-height: 1;
}
.stat-plus {
    display: inline-block;
    font-size: clamp(24px, 3vw, 36px);
    font-weight: 800;
    color: var(--c-accent);
    vertical-align: top;
    line-height: 1;
}
.stat-label {
    margin-top: 8px;
    font-size: 14px;
    color: var(--c-text-2);
    letter-spacing: 0.05em;
}

/* ==================== About ==================== */
.about-grid {
    display: grid;
    grid-template-columns: 1.3fr 1fr;
    gap: 48px;
    align-items: start;
}
.about-lead {
    font-size: clamp(17px, 2vw, 21px);
    line-height: 1.8;
    color: var(--c-text);
    margin-bottom: 20px;
    font-weight: 500;
}
.about-body {
    font-size: 15px;
    line-height: 1.9;
    color: var(--c-text-2);
    margin-bottom: 16px;
}
.about-highlights {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin-top: 32px;
}
.highlight-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: 12px;
    transition: var(--t);
}
.highlight-item:hover {
    border-color: var(--c-border-h);
    background: var(--c-surface-h);
    transform: translateY(-2px);
}
.highlight-icon {
    width: 44px; height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--c-accent-glow);
    border-radius: 10px;
    color: var(--c-accent);
    flex-shrink: 0;
}
.highlight-item span { font-size: 14px; font-weight: 500; }

.about-visual { position: sticky; top: 120px; }
.about-card {
    background: linear-gradient(145deg, var(--c-bg-3) 0%, var(--c-bg-2) 100%);
    border: 1px solid var(--c-border);
    border-radius: 20px;
    padding: 32px;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-card);
}
.card-header {
    position: relative;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--c-border);
}
.card-glow {
    position: absolute;
    top: -50px; right: -50px;
    width: 150px; height: 150px;
    background: radial-gradient(circle, var(--c-accent-glow) 0%, transparent 70%);
    pointer-events: none;
}
.card-label {
    font-size: 18px;
    font-weight: 700;
    color: var(--c-text);
    position: relative;
}
.card-list li {
    padding: 12px 0;
    font-size: 14px;
    color: var(--c-text-2);
    border-bottom: 1px solid rgba(255,255,255,0.04);
}
.card-list li:last-child { border-bottom: none; }
.about-location {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 20px;
    padding: 12px 20px;
    background: var(--c-surface);
    border-radius: 12px;
    font-size: 13px;
    color: var(--c-text-2);
}

/* ==================== Technology ==================== */
.tech-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}
.tech-card {
    position: relative;
    padding: 36px;
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: 20px;
    overflow: hidden;
    transition: var(--t);
    cursor: default;
}
.tech-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--c-gradient);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.5s ease;
}
.tech-card:hover {
    border-color: var(--c-border-h);
    background: var(--c-surface-h);
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}
.tech-card:hover::before { transform: scaleX(1); }
.tech-icon {
    width: 56px; height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--c-accent-glow);
    border-radius: 14px;
    color: var(--c-accent);
    margin-bottom: 24px;
    transition: var(--t);
}
.tech-card:hover .tech-icon {
    background: var(--c-gradient);
    color: #fff;
    transform: scale(1.05);
}
.tech-number {
    position: absolute;
    top: 24px; right: 28px;
    font-size: 56px;
    font-weight: 900;
    color: rgba(255,255,255,0.04);
    line-height: 1;
}
.tech-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--c-text);
}
.tech-desc {
    font-size: 14px;
    line-height: 1.8;
    color: var(--c-text-2);
    margin-bottom: 20px;
}
.tech-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.tech-tag {
    padding: 4px 12px;
    font-size: 12px;
    color: var(--c-text-2);
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: 100px;
}

/* ==================== Products ==================== */
.product-tabs {
    display: flex;
    gap: 8px;
    justify-content: center;
    margin-bottom: 40px;
    flex-wrap: wrap;
}
.product-tab {
    padding: 10px 24px;
    font-size: 14px;
    font-weight: 500;
    color: var(--c-text-2);
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: 100px;
    transition: var(--t-fast);
    cursor: pointer;
}
.product-tab:hover { color: var(--c-text); border-color: var(--c-border-h); }
.product-tab.active {
    color: #fff;
    background: var(--c-gradient);
    border-color: transparent;
    box-shadow: 0 2px 12px var(--c-accent-glow);
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.product-card {
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: 20px;
    overflow: hidden;
    transition: var(--t);
    display: flex;
    flex-direction: column;
}
.product-card:hover {
    border-color: var(--c-border-h);
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
}
.product-image {
    height: 200px;
    background: linear-gradient(135deg, var(--c-bg-3) 0%, var(--c-bg-2) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}
.product-image::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 50% 50%, var(--c-accent-glow) 0%, transparent 60%);
}
.product-icon {
    position: relative;
    z-index: 1;
    color: var(--c-accent);
    opacity: 0.8;
}
.product-card:hover .product-icon { opacity: 1; transform: scale(1.1); }
.product-body {
    padding: 28px;
    flex: 1;
    display: flex;
    flex-direction: column;
}
.product-category {
    font-size: 12px;
    color: var(--c-accent);
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 8px;
}
.product-name {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--c-text);
}
.product-desc {
    font-size: 14px;
    line-height: 1.7;
    color: var(--c-text-2);
    margin-bottom: 20px;
    flex: 1;
}
.product-specs { margin-bottom: 20px; }
.product-spec {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    font-size: 13px;
    border-bottom: 1px solid rgba(255,255,255,0.04);
}
.product-spec:last-child { border-bottom: none; }
.spec-label { color: var(--c-text-3); }
.spec-value { color: var(--c-text-2); font-weight: 500; }
.product-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 600;
    color: var(--c-accent);
    transition: var(--t-fast);
}
.product-link:hover { gap: 12px; }

/* ==================== Patents ==================== */
.patent-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.patent-card {
    padding: 32px;
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: 16px;
    transition: var(--t);
    position: relative;
    overflow: hidden;
}
.patent-card::before {
    content: '';
    position: absolute;
    top: 0; right: 0;
    width: 80px; height: 80px;
    background: radial-gradient(circle, var(--c-accent-glow) 0%, transparent 70%);
    opacity: 0;
    transition: var(--t);
}
.patent-card:hover {
    border-color: var(--c-border-h);
    transform: translateY(-4px);
}
.patent-card:hover::before { opacity: 1; }
.patent-icon {
    width: 48px; height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--c-accent-glow);
    border-radius: 12px;
    color: var(--c-accent);
    margin-bottom: 20px;
    position: relative;
}
.patent-number {
    font-size: 12px;
    color: var(--c-text-3);
    font-family: var(--font-mono);
    margin-bottom: 8px;
    position: relative;
}
.patent-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--c-text);
    line-height: 1.5;
    margin-bottom: 8px;
    position: relative;
}
.patent-type {
    font-size: 12px;
    color: var(--c-accent);
    padding: 3px 10px;
    background: var(--c-accent-glow);
    border-radius: 100px;
    display: inline-block;
    position: relative;
}

/* ==================== Solutions ==================== */
.solution-process {
    position: relative;
    margin-bottom: 80px;
}
.process-line {
    position: absolute;
    top: 40px;
    left: 10%;
    right: 10%;
    height: 2px;
    background: linear-gradient(90deg, transparent 0%, var(--c-border) 10%, var(--c-border) 90%, transparent 100%);
}
.process-steps {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 16px;
    position: relative;
}
.process-step {
    text-align: center;
    position: relative;
}
.step-circle {
    width: 80px; height: 80px;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--c-bg-2);
    border: 2px solid var(--c-border);
    border-radius: 50%;
    font-size: 24px;
    font-weight: 800;
    color: var(--c-text-2);
    transition: var(--t);
    position: relative;
    z-index: 1;
}
.process-step:hover .step-circle {
    border-color: var(--c-accent);
    color: var(--c-accent);
    background: var(--c-bg-3);
    transform: scale(1.1);
    box-shadow: 0 0 24px var(--c-accent-glow);
}
.step-title {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--c-text);
}
.step-desc {
    font-size: 12px;
    color: var(--c-text-3);
    line-height: 1.5;
}

.why-us { margin-top: 64px; }
.why-title {
    text-align: center;
    font-size: clamp(22px, 3vw, 32px);
    font-weight: 700;
    margin-bottom: 40px;
}
.why-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.why-card {
    padding: 28px;
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: 16px;
    transition: var(--t);
}
.why-card:hover {
    border-color: var(--c-border-h);
    transform: translateY(-4px);
}
.why-icon {
    width: 44px; height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--c-accent-glow);
    border-radius: 10px;
    color: var(--c-accent);
    margin-bottom: 16px;
}
.why-title-text {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
}
.why-desc {
    font-size: 13px;
    line-height: 1.7;
    color: var(--c-text-2);
}

/* ==================== Contact ==================== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 48px;
    align-items: start;
}
.contact-info { display: flex; flex-direction: column; gap: 24px; }
.info-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    padding: 20px;
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: 14px;
    transition: var(--t);
}
.info-item:hover { border-color: var(--c-border-h); }
.info-icon {
    width: 44px; height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--c-accent-glow);
    border-radius: 10px;
    color: var(--c-accent);
    flex-shrink: 0;
}
.info-item h4 { font-size: 15px; font-weight: 600; margin-bottom: 4px; }
.info-item p { font-size: 14px; color: var(--c-text-2); }
.info-item a:hover { color: var(--c-accent); }

.contact-form-wrap {
    background: linear-gradient(145deg, var(--c-bg-3) 0%, var(--c-bg-2) 100%);
    border: 1px solid var(--c-border);
    border-radius: 20px;
    padding: 40px;
    box-shadow: var(--shadow-card);
}
.form-title { font-size: 22px; font-weight: 700; margin-bottom: 6px; }
.form-desc { font-size: 14px; color: var(--c-text-2); margin-bottom: 28px; }
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}
.form-group { margin-bottom: 20px; }
.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--c-text-2);
    margin-bottom: 8px;
}
.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    font-size: 14px;
    color: var(--c-text);
    background: var(--c-bg);
    border: 1px solid var(--c-border);
    border-radius: 10px;
    transition: var(--t-fast);
    outline: none;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--c-accent);
    box-shadow: 0 0 0 3px var(--c-accent-glow);
}
.form-group textarea { resize: vertical; }
.form-success {
    margin-top: 16px;
    padding: 12px 20px;
    background: rgba(34,197,94,0.1);
    border: 1px solid rgba(34,197,94,0.3);
    border-radius: 10px;
    color: var(--c-success);
    font-size: 14px;
    display: none;
}
.form-success.show { display: block; animation: fadeIn 0.4s ease; }

/* ==================== Footer ==================== */
.footer {
    padding: 64px 0 32px;
    background: var(--c-bg-2);
    border-top: 1px solid var(--c-border);
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 40px;
}
.footer-logo {
    font-size: 28px;
    font-weight: 800;
    letter-spacing: 0.1em;
    margin-bottom: 12px;
}
.footer-tagline { font-size: 14px; color: var(--c-text-2); margin-bottom: 16px; }
.footer-copy { font-size: 12px; color: var(--c-text-3); }
.footer-links h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--c-text);
}
.footer-links a {
    display: block;
    font-size: 13px;
    color: var(--c-text-2);
    margin-bottom: 10px;
    transition: var(--t-fast);
}
.footer-links a:hover { color: var(--c-accent); }

/* ==================== Back to Top ==================== */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px; height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--c-gradient);
    color: #fff;
    border-radius: 14px;
    z-index: 100;
    opacity: 0;
    visibility: hidden;
    transition: var(--t);
    box-shadow: 0 4px 20px var(--c-accent-glow);
}
.back-to-top.show { opacity: 1; visibility: visible; }
.back-to-top:hover { transform: translateY(-4px); }

/* ==================== Responsive ==================== */
@media (max-width: 1024px) {
    .tech-grid { grid-template-columns: 1fr; }
    .product-grid { grid-template-columns: repeat(2, 1fr); }
    .patent-grid { grid-template-columns: repeat(2, 1fr); }
    .why-grid { grid-template-columns: repeat(2, 1fr); }
    .process-steps { grid-template-columns: repeat(3, 1fr); gap: 32px; }
    .process-line { display: none; }
    .about-grid { grid-template-columns: 1fr; }
    .about-visual { position: static; }
    .contact-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 0; right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--c-bg-2);
        flex-direction: column;
        align-items: flex-start;
        padding: 80px 24px 24px;
        gap: 4px;
        transition: right 0.4s ease;
        border-left: 1px solid var(--c-border);
    }
    .nav-menu.open { right: 0; }
    .nav-link { width: 100%; padding: 14px 16px; }
    .nav-burger { display: flex; z-index: 1001; }
    .lang-toggle { margin-left: 0; margin-top: 16px; }

    .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 32px; }
    .stat-item::after { display: none; }
    .stat-item:nth-child(odd) { border-right: 1px solid var(--c-border); }

    .about-highlights { grid-template-columns: 1fr; }
    .product-grid { grid-template-columns: 1fr; }
    .patent-grid { grid-template-columns: 1fr; }
    .why-grid { grid-template-columns: 1fr; }
    .process-steps { grid-template-columns: repeat(2, 1fr); }
    .form-row { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; gap: 32px; }

    .hero-actions { flex-direction: column; align-items: center; }
    .btn { width: 100%; justify-content: center; max-width: 280px; }

    .contact-form-wrap { padding: 24px; }
    .back-to-top { bottom: 20px; right: 20px; }
}

@media (max-width: 480px) {
    .stats-grid { grid-template-columns: 1fr; }
    .stat-item { border: none !important; }
    .process-steps { grid-template-columns: 1fr; }
}

/* ==================== Print ==================== */
@media print {
    .navbar, .back-to-top, .hero-scroll, .loader { display: none; }
    body { background: #fff; color: #000; }
}