/* ═══════════════════════════════════════════════════════════
   VARIABLES
═══════════════════════════════════════════════════════════ */
:root {
    --sl-accent: #2563eb;
    --sl-accent2: #0ea5e9;
    --sl-green: #10b981;
    --sl-yellow: #f59e0b;
    --sl-red: #ef4444;
    --sl-purple: #8b5cf6;
    --sl-bg: var(--bg1,#0d1117);
    --sl-bg2: var(--bg2,#161b22);
    --sl-bg3: var(--bg3,#1c2333);
    --sl-line: var(--line,rgba(255,255,255,.08));
    --sl-line2: var(--line2,rgba(255,255,255,.13));
    --sl-t1: var(--t1,#f0f6fc);
    --sl-t2: var(--t2,#c9d1d9);
    --sl-t3: var(--t3,#8b949e);
    --sl-r: 10px;
    --sl-r-sm: 7px;
    --sl-r-lg: 16px;
    --sl-mono: 'JetBrains Mono','Fira Code',monospace;
    --sl-shadow: 0 4px 24px rgba(0,0,0,.35);
    --sl-shadow-sm: 0 2px 10px rgba(0,0,0,.25);
}

/* ═══════════════════════════════════════════════════════════
   3D PARALLAX ICON LAYER  — fixed behind everything
═══════════════════════════════════════════════════════════ */
#gt-bg-canvas {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

    /* Deep ambient gradients */
    #gt-bg-canvas::before {
        content: '';
        position: absolute;
        inset: 0;
        background: radial-gradient(ellipse 80% 50% at 20% 10%, rgba(37,99,235,.07) 0%, transparent 60%), radial-gradient(ellipse 60% 45% at 80% 40%, rgba(139,92,246,.06) 0%, transparent 55%), radial-gradient(ellipse 70% 50% at 50% 100%, rgba(16,185,129,.05) 0%, transparent 60%);
        animation: ambient-shift 18s ease-in-out infinite alternate;
    }

@keyframes ambient-shift {
    0% {
        opacity: .7;
        transform: scale(1);
    }

    100% {
        opacity: 1;
        transform: scale(1.06);
    }
}

/* Stars / tiny dots */
.gt-star {
    position: absolute;
    border-radius: 50%;
    background: #fff;
    animation: gt-twinkle var(--d) ease-in-out infinite var(--dl);
}

@keyframes gt-twinkle {
    0%,100% {
        opacity: .06;
        transform: scale(1);
    }

    50% {
        opacity: .65;
        transform: scale(1.8);
    }
}

/* ── Individual 3D icons that parallax on scroll ── */
.gt-ico3d {
    position: absolute;
    animation: gt-float var(--gf) ease-in-out infinite var(--gd);
    will-change: transform;
    /* parallax offset applied via JS: --scroll-offset */
    transform: translateY(calc(var(--py-scroll, 0px)));
}

@keyframes gt-float {
    0%,100% {
        filter: var(--glow);
        transform: translateY(var(--py-scroll,0px)) rotate(var(--r0,0deg));
    }

    40% {
        filter: var(--glow-bright);
        transform: translateY(calc(var(--py-scroll,0px) + var(--fy,-14px))) rotate(var(--r1,4deg));
    }

    70% {
        filter: var(--glow);
        transform: translateY(calc(var(--py-scroll,0px) - var(--fy2,6px))) rotate(var(--r2,-3deg));
    }
}

.gt-ico3d img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
    user-select: none;
    -webkit-user-drag: none;
}

/* glow aura behind icon */
.gt-ico3d::before {
    content: '';
    position: absolute;
    inset: -35%;
    border-radius: 50%;
    background: var(--aura);
    filter: blur(24px);
    z-index: -1;
    animation: aura-pulse var(--gf) ease-in-out infinite var(--gd);
}

@keyframes aura-pulse {
    0%,100% {
        opacity: .55;
        transform: scale(1);
    }

    50% {
        opacity: 1;
        transform: scale(1.18);
    }
}

/* ── Icon configs ── */

/* React — top-right area */
.gico-react {
    width: 130px;
    height: 130px;
    top: 6vh;
    left: 68%;
    --gf: 7s;
    --gd: 0s;
    --fy: -18px;
    --fy2: 8px;
    --r0: -3deg;
    --r1: 5deg;
    --r2: -2deg;
    --glow: drop-shadow(0 0 18px rgba(97,218,251,.75)) drop-shadow(0 0 40px rgba(97,218,251,.30));
    --glow-bright: drop-shadow(0 0 28px rgba(97,218,251,.95)) drop-shadow(0 0 60px rgba(97,218,251,.45));
    --aura: radial-gradient(circle, rgba(97,218,251,.28) 0%, transparent 70%);
    --parallax-speed: 0.18;
}

/* JavaScript — left mid-top */
.gico-js {
    width: 95px;
    height: 95px;
    top: 22vh;
    left: 5%;
    --gf: 8.5s;
    --gd: -2s;
    --fy: -14px;
    --fy2: 6px;
    --r0: 4deg;
    --r1: -5deg;
    --r2: 3deg;
    --glow: drop-shadow(0 0 16px rgba(247,223,30,.80)) drop-shadow(0 0 36px rgba(247,223,30,.32));
    --glow-bright: drop-shadow(0 0 26px rgba(247,223,30,1)) drop-shadow(0 0 55px rgba(247,223,30,.50));
    --aura: radial-gradient(circle, rgba(247,223,30,.25) 0%, transparent 70%);
    --parallax-speed: 0.24;
}

/* C# — top far-left */
.gico-csharp {
    width: 80px;
    height: 80px;
    top: 8vh;
    left: 3%;
    --gf: 9s;
    --gd: -4s;
    --fy: -12px;
    --fy2: 5px;
    --r0: -2deg;
    --r1: 4deg;
    --r2: -3deg;
    --glow: drop-shadow(0 0 14px rgba(147,80,207,.80)) drop-shadow(0 0 34px rgba(147,80,207,.30));
    --glow-bright: drop-shadow(0 0 22px rgba(147,80,207,1)) drop-shadow(0 0 50px rgba(147,80,207,.48));
    --aura: radial-gradient(circle, rgba(147,80,207,.24) 0%, transparent 70%);
    --parallax-speed: 0.30;
}

/* SQL — right mid */
.gico-sql {
    width: 110px;
    height: 110px;
    top: 38vh;
    left: 78%;
    --gf: 6.5s;
    --gd: -1s;
    --fy: -16px;
    --fy2: 7px;
    --r0: 3deg;
    --r1: -4deg;
    --r2: 5deg;
    --glow: drop-shadow(0 0 16px rgba(0,150,220,.80)) drop-shadow(0 0 38px rgba(0,150,220,.30));
    --glow-bright: drop-shadow(0 0 26px rgba(0,150,220,1)) drop-shadow(0 0 58px rgba(0,150,220,.48));
    --aura: radial-gradient(circle, rgba(0,150,220,.24) 0%, transparent 70%);
    --parallax-speed: 0.14;
}

/* VS Code — mid-left */
.gico-vs {
    width: 85px;
    height: 85px;
    top: 55vh;
    left: 8%;
    --gf: 7.5s;
    --gd: -3s;
    --fy: -12px;
    --fy2: 5px;
    --r0: -4deg;
    --r1: 3deg;
    --r2: -5deg;
    --glow: drop-shadow(0 0 14px rgba(0,122,204,.80)) drop-shadow(0 0 34px rgba(0,122,204,.30));
    --glow-bright: drop-shadow(0 0 22px rgba(0,122,204,1)) drop-shadow(0 0 50px rgba(0,122,204,.48));
    --aura: radial-gradient(circle, rgba(0,122,204,.24) 0%, transparent 70%);
    --parallax-speed: 0.20;
}

/* Bootstrap — bottom-right */
.gico-bt {
    width: 88px;
    height: 88px;
    top: 72vh;
    left: 72%;
    --gf: 8s;
    --gd: -5s;
    --fy: -14px;
    --fy2: 6px;
    --r0: 2deg;
    --r1: -5deg;
    --r2: 4deg;
    --glow: drop-shadow(0 0 14px rgba(121,82,179,.80)) drop-shadow(0 0 34px rgba(121,82,179,.30));
    --glow-bright: drop-shadow(0 0 22px rgba(121,82,179,1)) drop-shadow(0 0 52px rgba(121,82,179,.48));
    --aura: radial-gradient(circle, rgba(121,82,179,.24) 0%, transparent 70%);
    --parallax-speed: 0.12;
}

/* Rocket — top-right corner */
.gico-rocket {
    width: 72px;
    height: 72px;
    top: 3vh;
    left: 88%;
    --gf: 5.5s;
    --gd: -2.5s;
    --fy: -22px;
    --fy2: 10px;
    --r0: -10deg;
    --r1: 10deg;
    --r2: -8deg;
    --glow: drop-shadow(0 0 12px rgba(100,180,255,.80)) drop-shadow(0 0 30px rgba(100,180,255,.32));
    --glow-bright: drop-shadow(0 0 20px rgba(100,180,255,1)) drop-shadow(0 0 48px rgba(100,180,255,.50));
    --aura: radial-gradient(circle, rgba(100,180,255,.22) 0%, transparent 70%);
    --parallax-speed: 0.35;
}

/* GetCode — centre-left subtle */
.gico-getcode {
    width: 65px;
    height: 65px;
    top: 45vh;
    left: 42%;
    --gf: 11s;
    --gd: -6s;
    --fy: -10px;
    --fy2: 4px;
    --r0: 0deg;
    --r1: 3deg;
    --r2: -2deg;
    --glow: drop-shadow(0 0 10px rgba(59,130,246,.70)) drop-shadow(0 0 28px rgba(59,130,246,.28));
    --glow-bright: drop-shadow(0 0 18px rgba(59,130,246,.95)) drop-shadow(0 0 42px rgba(59,130,246,.45));
    --aura: radial-gradient(circle, rgba(59,130,246,.20) 0%, transparent 70%);
    --parallax-speed: 0.08;
}

/* Extra smaller icons for lower page sections */
.gico-react-sm {
    width: 60px;
    height: 60px;
    top: 115vh;
    left: 12%;
    --gf: 7s;
    --gd: -1s;
    --fy: -12px;
    --fy2: 5px;
    --r0: 2deg;
    --r1: -4deg;
    --r2: 3deg;
    --glow: drop-shadow(0 0 12px rgba(97,218,251,.70)) drop-shadow(0 0 28px rgba(97,218,251,.25));
    --glow-bright: drop-shadow(0 0 20px rgba(97,218,251,.95)) drop-shadow(0 0 45px rgba(97,218,251,.40));
    --aura: radial-gradient(circle, rgba(97,218,251,.20) 0%, transparent 70%);
    --parallax-speed: 0.22;
}

.gico-js-sm {
    width: 55px;
    height: 55px;
    top: 130vh;
    left: 82%;
    --gf: 8s;
    --gd: -3s;
    --fy: -10px;
    --fy2: 4px;
    --r0: -3deg;
    --r1: 4deg;
    --r2: -2deg;
    --glow: drop-shadow(0 0 12px rgba(247,223,30,.75)) drop-shadow(0 0 28px rgba(247,223,30,.28));
    --glow-bright: drop-shadow(0 0 20px rgba(247,223,30,1)) drop-shadow(0 0 44px rgba(247,223,30,.45));
    --aura: radial-gradient(circle, rgba(247,223,30,.20) 0%, transparent 70%);
    --parallax-speed: 0.16;
}

.gico-sql-sm {
    width: 62px;
    height: 62px;
    top: 165vh;
    left: 6%;
    --gf: 6s;
    --gd: -4s;
    --fy: -12px;
    --fy2: 5px;
    --r0: 3deg;
    --r1: -3deg;
    --r2: 4deg;
    --glow: drop-shadow(0 0 12px rgba(0,150,220,.75)) drop-shadow(0 0 28px rgba(0,150,220,.28));
    --glow-bright: drop-shadow(0 0 20px rgba(0,150,220,1)) drop-shadow(0 0 44px rgba(0,150,220,.45));
    --aura: radial-gradient(circle, rgba(0,150,220,.20) 0%, transparent 70%);
    --parallax-speed: 0.26;
}

.gico-bt-sm {
    width: 58px;
    height: 58px;
    top: 180vh;
    left: 75%;
    --gf: 9s;
    --gd: -2s;
    --fy: -11px;
    --fy2: 5px;
    --r0: -2deg;
    --r1: 5deg;
    --r2: -3deg;
    --glow: drop-shadow(0 0 12px rgba(121,82,179,.75)) drop-shadow(0 0 28px rgba(121,82,179,.28));
    --glow-bright: drop-shadow(0 0 20px rgba(121,82,179,1)) drop-shadow(0 0 44px rgba(121,82,179,.45));
    --aura: radial-gradient(circle, rgba(121,82,179,.20) 0%, transparent 70%);
    --parallax-speed: 0.18;
}

.gico-vs-sm {
    width: 56px;
    height: 56px;
    top: 210vh;
    left: 60%;
    --gf: 7s;
    --gd: -5s;
    --fy: -10px;
    --fy2: 4px;
    --r0: 4deg;
    --r1: -3deg;
    --r2: 5deg;
    --glow: drop-shadow(0 0 12px rgba(0,122,204,.75)) drop-shadow(0 0 28px rgba(0,122,204,.28));
    --glow-bright: drop-shadow(0 0 20px rgba(0,122,204,1)) drop-shadow(0 0 44px rgba(0,122,204,.45));
    --aura: radial-gradient(circle, rgba(0,122,204,.20) 0%, transparent 70%);
    --parallax-speed: 0.20;
}

.gico-rocket-sm {
    width: 50px;
    height: 50px;
    top: 230vh;
    left: 20%;
    --gf: 5s;
    --gd: -1s;
    --fy: -18px;
    --fy2: 8px;
    --r0: -8deg;
    --r1: 8deg;
    --r2: -7deg;
    --glow: drop-shadow(0 0 10px rgba(100,180,255,.75)) drop-shadow(0 0 26px rgba(100,180,255,.28));
    --glow-bright: drop-shadow(0 0 18px rgba(100,180,255,1)) drop-shadow(0 0 40px rgba(100,180,255,.45));
    --aura: radial-gradient(circle, rgba(100,180,255,.18) 0%, transparent 70%);
    --parallax-speed: 0.28;
}

/* Floating particles */
.gt-particle {
    position: absolute;
    border-radius: 50%;
    animation: gt-part-fly var(--pf) ease-in-out infinite var(--pd);
    will-change: transform;
}

@keyframes gt-part-fly {
    0%,100% {
        transform: translate(0,0) scale(1);
        opacity: .45;
    }

    50% {
        transform: translate(var(--px),var(--py)) scale(1.5);
        opacity: .9;
    }
}

/* ═══════════════════════════════════════════════════════════
   PAGE LAYOUT
═══════════════════════════════════════════════════════════ */
.gt-page {
    position: relative;
    z-index: 1;
    max-width: 1060px;
    margin: 0 auto;
    padding: 0 20px 80px;
}

/* ── Hero ── */
/* ── Hero ── */
.gt-hero {
    position: relative;
    border-radius: var(--sl-r-lg);
    overflow: hidden;
    margin-bottom: 56px;
    height: 320px;
    /* XÓA dòng này: */
    /* background: linear-gradient(125deg, #0f2460 0%, #1d4ed8 50%, #0891b2 100%); */
    /* THÊM vào: */
    background: url('/Assets/img/nenvs.jpg') center/cover no-repeat;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    box-shadow: 0 8px 48px rgba(37,99,235,.25), 0 0 0 1px rgba(255,255,255,.06);
}

    .gt-hero::before {
        content: '';
        position: absolute;
        inset: 0;
        /* Thêm overlay đen mờ + giữ pattern cũ */
        background: linear-gradient(135deg, rgba(0,0,0,0.62) 0%, rgba(10,15,40,0.70) 100%), repeating-linear-gradient(-52deg, transparent, transparent 20px, rgba(255,255,255,.018) 20px, rgba(255,255,255,.018) 40px);
    }

.gt-hero-wm {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
}

    .gt-hero-wm span {
        position: absolute;
        right: 30px;
        top: 50%;
        transform: translateY(-50%) rotate(-6deg);
        font-family: var(--sl-mono);
        font-size: 60px;
        font-weight: 700;
        letter-spacing: -2px;
        color: rgba(255,255,255,.045);
        white-space: nowrap;
    }

.gt-hero-content {
    position: relative;
    z-index: 1;
    padding: 24px;
}

.gt-hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    background: rgba(255,255,255,.12);
    border: 1px solid rgba(255,255,255,.2);
    border-radius: 20px;
    padding: 5px 14px;
    font-size: 12px;
    font-weight: 600;
    color: rgba(255,255,255,.85);
    letter-spacing: .3px;
    margin-bottom: 18px;
}

.gt-hero-title {
    font-size: 42px;
    font-weight: 800;
    color: #fff;
    line-height: 1.15;
    margin-bottom: 14px;
    letter-spacing: -1px;
}

    .gt-hero-title span {
        color: #60a5fa;
    }

.gt-hero-sub {
    font-size: 16px;
    color: rgba(255,255,255,.7);
    max-width: 520px;
    line-height: 1.7;
    margin: 0 auto;
}

/* ── Stats ── */
.gt-stats {
    display: grid;
    grid-template-columns: repeat(4,1fr);
    gap: 14px;
    margin-bottom: 56px;
}

.gt-stat {
    background: var(--sl-bg2);
    border: 1px solid var(--sl-line);
    border-radius: var(--sl-r);
    padding: 20px 18px;
    text-align: center;
    box-shadow: var(--sl-shadow-sm);
    transition: border-color .2s, transform .2s;
    backdrop-filter: blur(6px);
}

    .gt-stat:hover {
        border-color: var(--sl-line2);
        transform: translateY(-2px);
    }

.gt-stat-val {
    font-size: 32px;
    font-weight: 800;
    font-family: var(--sl-mono);
    color: var(--sl-t1);
    line-height: 1;
    margin-bottom: 5px;
    letter-spacing: -1px;
}

.gt-stat-lbl {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .5px;
    color: var(--sl-t3);
}

/* ── Section headings ── */
.gt-section-title {
    font-size: 26px;
    font-weight: 800;
    color: var(--sl-t1);
    margin-bottom: 6px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.gt-section-sub {
    font-size: 14px;
    color: var(--sl-t3);
    margin-bottom: 28px;
    line-height: 1.7;
}

/* ── Mission / Vision ── */
.gt-mv-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
    margin-bottom: 56px;
}

.gt-mv-card {
    background: var(--sl-bg2);
    border: 1px solid var(--sl-line);
    border-radius: var(--sl-r);
    padding: 28px 24px;
    box-shadow: var(--sl-shadow-sm);
    transition: border-color .2s;
    backdrop-filter: blur(6px);
}

    .gt-mv-card:hover {
        border-color: var(--sl-line2);
    }

.gt-mv-ico {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    margin-bottom: 16px;
}

.ico-mission {
    background: rgba(37,99,235,.14);
    color: var(--sl-accent2);
}

.ico-vision {
    background: rgba(16,185,129,.14);
    color: var(--sl-green);
}

.gt-mv-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--sl-t1);
    margin-bottom: 10px;
}

.gt-mv-text {
    font-size: 14px;
    color: var(--sl-t2);
    line-height: 1.75;
}

/* ── Features ── */
.gt-features {
    margin-bottom: 56px;
}

.gt-feat-grid {
    display: grid;
    grid-template-columns: repeat(3,1fr);
    gap: 16px;
}

.gt-feat-card {
    background: var(--sl-bg2);
    border: 1px solid var(--sl-line);
    border-radius: var(--sl-r);
    padding: 22px 20px;
    box-shadow: var(--sl-shadow-sm);
    transition: border-color .18s, transform .18s;
    backdrop-filter: blur(6px);
}

    .gt-feat-card:hover {
        border-color: var(--sl-line2);
        transform: translateY(-2px);
    }

.gt-feat-ico {
    width: 42px;
    height: 42px;
    border-radius: 11px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    margin-bottom: 14px;
}

.gt-feat-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--sl-t1);
    margin-bottom: 6px;
}

.gt-feat-text {
    font-size: 13px;
    color: var(--sl-t3);
    line-height: 1.65;
}

/* ── Values ── */
.gt-values {
    margin-bottom: 56px;
}

.gt-val-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.gt-val-item {
    background: var(--sl-bg2);
    border: 1px solid var(--sl-line);
    border-radius: var(--sl-r);
    padding: 18px 20px;
    display: flex;
    align-items: flex-start;
    gap: 16px;
    box-shadow: var(--sl-shadow-sm);
    backdrop-filter: blur(6px);
}

.gt-val-num {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(37,99,235,.14);
    border: 1px solid rgba(37,99,235,.24);
    color: var(--sl-accent2);
    font-size: 14px;
    font-weight: 800;
    font-family: var(--sl-mono);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.gt-val-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--sl-t1);
    margin-bottom: 4px;
}

.gt-val-text {
    font-size: 13px;
    color: var(--sl-t3);
    line-height: 1.65;
}

/* ── CTA ── */
.gt-cta {
    background: linear-gradient(135deg, rgba(37,99,235,.12), rgba(8,145,178,.07));
    border: 1px solid rgba(37,99,235,.2);
    border-radius: var(--sl-r-lg);
    padding: 48px 32px;
    text-align: center;
    backdrop-filter: blur(8px);
}

.gt-cta-title {
    font-size: 26px;
    font-weight: 800;
    color: var(--sl-t1);
    margin-bottom: 10px;
}

.gt-cta-sub {
    font-size: 14px;
    color: var(--sl-t3);
    margin-bottom: 24px;
}

.gt-cta-btns {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ── Responsive ── */
@media (max-width: 900px) {
    .gt-stats {
        grid-template-columns: repeat(2,1fr);
    }

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

@media (max-width: 600px) {
    .gt-page {
        padding: 0 12px 60px;
    }

    .gt-hero {
        height: 240px;
        margin-bottom: 36px;
    }

    .gt-hero-title {
        font-size: 26px;
    }

    .gt-hero-sub {
        font-size: 14px;
    }

    .gt-stats {
        grid-template-columns: repeat(2,1fr);
        gap: 10px;
        margin-bottom: 36px;
    }

    .gt-stat-val {
        font-size: 24px;
    }

    .gt-mv-grid {
        grid-template-columns: 1fr;
    }

    .gt-feat-grid {
        grid-template-columns: 1fr;
    }

    .gt-section-title {
        font-size: 20px;
    }

    .gt-cta {
        padding: 32px 20px;
    }

    .gt-cta-title {
        font-size: 20px;
    }
}