/* ═══════════════════════════════════════════════════════════════
   AgriVerse — Immersive 3D Sensor Showcase
   Premium dark theme with glassmorphism, glow, depth
   ═══════════════════════════════════════════════════════════════ */

/* ── CSS Variables ──────────────────────────────────────────── */
:root {
    --bg-base: #04060b;
    --bg-primary: #06090f;
    --bg-secondary: #0a0f1a;
    --bg-tertiary: #0e1525;
    --bg-card: rgba(12, 18, 32, 0.7);
    --bg-card-solid: #0c1220;
    --bg-glass: rgba(8, 14, 28, 0.85);
    --bg-glass-light: rgba(14, 22, 40, 0.6);
    --bg-glass-ultra: rgba(6, 10, 20, 0.92);

    --border-dim: rgba(255, 255, 255, 0.04);
    --border-subtle: rgba(255, 255, 255, 0.07);
    --border-accent: rgba(74, 222, 128, 0.2);
    --border-glow: rgba(74, 222, 128, 0.4);

    --text-primary: #ffffff;
    --text-secondary: #cdd6e4;
    --text-muted: #99a8bc;
    --text-accent: #4ade80;
    --text-accent-bright: #6aee9a;

    --accent-green: #4ade80;
    --accent-emerald: #34d399;
    --accent-cyan: #22d3ee;
    --accent-blue: #3b82f6;
    --accent-purple: #a78bfa;
    --accent-amber: #fbbf24;
    --accent-rose: #fb7185;
    --accent-orange: #fb923c;

    --gradient-main: linear-gradient(135deg, #4ade80, #22d3ee);
    --gradient-hero: linear-gradient(135deg, #4ade80 0%, #22d3ee 50%, #3b82f6 100%);
    --gradient-card: linear-gradient(160deg, rgba(74, 222, 128, 0.05), rgba(34, 211, 238, 0.03));

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 16px 64px rgba(0, 0, 0, 0.6);
    --shadow-glow-sm: 0 0 20px rgba(74, 222, 128, 0.06);
    --shadow-glow-md: 0 0 40px rgba(74, 222, 128, 0.1);
    --shadow-glow-lg: 0 4px 60px rgba(74, 222, 128, 0.15);

    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    --font-sans: 'IBM Plex Sans Arabic', 'Noto Kufi Arabic', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;

    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --transition-fast: 0.2s var(--ease-out);
    --transition-normal: 0.35s var(--ease-out);
    --transition-slow: 0.6s var(--ease-out);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    scrollbar-width: thin;
    scrollbar-color: rgba(74, 222, 128, 0.15) transparent;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-base);
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    line-height: 1.6;
}

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
    background: rgba(74, 222, 128, 0.15);
    border-radius: 8px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(74, 222, 128, 0.3);
}

/* ── Loading Screen ────────────────────────────────────────── */
#loading-screen {
    position: fixed;
    inset: 0;
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-base);
    transition: opacity 0.8s ease, visibility 0.8s ease;
}

#loading-screen.fade-out {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.loader-content {
    text-align: center;
}

.loader-orb {
    width: 80px;
    height: 80px;
    margin: 0 auto 32px;
    position: relative;
}

.loader-orb::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 50%;
    background: conic-gradient(from 0deg, transparent 0%, var(--accent-green) 40%, var(--accent-cyan) 60%, transparent 100%);
    animation: orb-spin 1.5s linear infinite;
}

.loader-orb::after {
    content: '';
    position: absolute;
    inset: 6px;
    border-radius: 50%;
    background: var(--bg-base);
}

@keyframes orb-spin {
    to { transform: rotate(360deg); }
}

.loader-content h1 {
    font-size: 28px;
    font-weight: 800;
    background: var(--gradient-hero);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
    letter-spacing: -0.5px;
}

.loader-content p {
    font-size: 13px;
    color: var(--text-muted);
    font-family: var(--font-mono);
    letter-spacing: 0.5px;
    margin-bottom: 32px;
}

.loader-track {
    width: 240px;
    height: 3px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
    margin: 0 auto;
}

.loader-fill {
    height: 100%;
    width: 0%;
    background: var(--gradient-main);
    border-radius: 4px;
    animation: fill-progress 2.5s ease-in-out forwards;
}

@keyframes fill-progress {
    0% { width: 0%; }
    30% { width: 50%; }
    70% { width: 85%; }
    100% { width: 100%; }
}

/* ── Background Effects ────────────────────────────────────── */
.bg-grid {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background-image:
        linear-gradient(rgba(74, 222, 128, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(74, 222, 128, 0.03) 1px, transparent 1px);
    background-size: 80px 80px;
    mask-image: radial-gradient(ellipse 80% 60% at 50% 30%, black 20%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 30%, black 20%, transparent 70%);
}

.bg-glow {
    position: fixed;
    z-index: 0;
    pointer-events: none;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.4;
}

.bg-glow-1 {
    width: 600px;
    height: 600px;
    top: -200px;
    left: -100px;
    background: rgba(74, 222, 128, 0.08);
}

.bg-glow-2 {
    width: 500px;
    height: 500px;
    top: 40%;
    right: -150px;
    background: rgba(34, 211, 238, 0.06);
}

.bg-glow-3 {
    width: 400px;
    height: 400px;
    bottom: -100px;
    left: 30%;
    background: rgba(59, 130, 246, 0.05);
}

/* ── Navigation ────────────────────────────────────────────── */
#top-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 32px;
    background: var(--bg-glass-ultra);
    backdrop-filter: blur(24px) saturate(1.2);
    -webkit-backdrop-filter: blur(24px) saturate(1.2);
    border-bottom: 1px solid var(--border-dim);
    transition: all var(--transition-normal);
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.nav-back {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: var(--radius-sm);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.nav-back:hover {
    background: rgba(74, 222, 128, 0.1);
    color: var(--accent-green);
    border-color: var(--border-accent);
    transform: translateX(-2px);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand-logo {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    background: var(--gradient-main);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
}

.brand-text {
    font-size: 16px;
    font-weight: 800;
    letter-spacing: -0.5px;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.brand-tag {
    font-size: 9px;
    font-weight: 700;
    font-family: var(--font-mono);
    padding: 3px 10px;
    border-radius: 20px;
    background: rgba(74, 222, 128, 0.1);
    color: var(--accent-green);
    border: 1px solid var(--border-accent);
    letter-spacing: 1.5px;
    text-transform: uppercase;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 18px;
    border-radius: var(--radius-sm);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 600;
    font-family: var(--font-sans);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.nav-btn:hover {
    background: rgba(74, 222, 128, 0.08);
    color: var(--text-primary);
    border-color: var(--border-accent);
}

.nav-btn svg {
    width: 16px;
    height: 16px;
}

/* ── Main Content Container ────────────────────────────────── */
.main-content {
    position: relative;
    z-index: 1;
    padding-top: 70px;
}

/* ── Hero Section ──────────────────────────────────────────── */
.hero {
    position: relative;
    padding: 100px 32px 80px;
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 18px;
    border-radius: 30px;
    background: rgba(74, 222, 128, 0.06);
    border: 1px solid var(--border-accent);
    font-size: 11px;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--accent-green);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 28px;
    animation: fade-in-up 0.8s var(--ease-out) forwards;
    opacity: 0;
}

.hero-eyebrow .dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent-green);
    animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(74, 222, 128, 0.4); }
    50% { opacity: 0.6; box-shadow: 0 0 0 6px rgba(74, 222, 128, 0); }
}

.hero h1 {
    font-size: clamp(38px, 6vw, 64px);
    font-weight: 900;
    line-height: 1.1;
    letter-spacing: -2px;
    margin-bottom: 20px;
    animation: fade-in-up 0.8s var(--ease-out) 0.1s forwards;
    opacity: 0;
}

.hero h1 .gradient-text {
    background: var(--gradient-hero);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: clamp(16px, 2vw, 19px);
    color: var(--text-secondary);
    max-width: 620px;
    margin: 0 auto 40px;
    line-height: 1.7;
    animation: fade-in-up 0.8s var(--ease-out) 0.2s forwards;
    opacity: 0;
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 40px;
    animation: fade-in-up 0.8s var(--ease-out) 0.3s forwards;
    opacity: 0;
}

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

.hero-stat-value {
    font-size: 32px;
    font-weight: 900;
    font-family: var(--font-mono);
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.hero-stat-label {
    font-size: 11px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    font-weight: 600;
    margin-top: 4px;
}

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

@keyframes fade-in-up {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ── Sensor Grid ───────────────────────────────────────────── */
.sensors-section {
    padding: 20px 32px 100px;
    max-width: 1400px;
    margin: 0 auto;
}

.sensor-card {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    margin-bottom: 48px;
    border-radius: var(--radius-lg);
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    overflow: hidden;
    position: relative;
    transition: all var(--transition-normal);
    opacity: 0;
    transform: translateY(40px);
}

.sensor-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.sensor-card:hover {
    border-color: var(--border-accent);
    box-shadow: var(--shadow-glow-md);
    transform: translateY(-4px);
}

.sensor-card.visible:hover {
    transform: translateY(-4px);
}

.sensor-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent-green), var(--accent-cyan), transparent);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.sensor-card:hover::before {
    opacity: 0.6;
}

/* Alternate layout */
.sensor-card:nth-child(even) {
    direction: ltr;
}
.sensor-card:nth-child(even) > * {
    direction: rtl;
}

/* ── 3D Viewer ─────────────────────────────────────────────── */
.sensor-viewer {
    position: relative;
    min-height: 420px;
    background: radial-gradient(ellipse at center, rgba(74, 222, 128, 0.03) 0%, transparent 70%);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.sensor-viewer canvas {
    width: 100% !important;
    height: 100% !important;
    cursor: grab;
    outline: none;
}

.sensor-viewer canvas:active {
    cursor: grabbing;
}

.viewer-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border-radius: 20px;
    background: var(--bg-glass-ultra);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-subtle);
    font-size: 10px;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--text-secondary);
    letter-spacing: 1px;
    text-transform: uppercase;
    z-index: 5;
}

.sensor-card:nth-child(even) .viewer-badge {
    right: auto;
    left: 16px;
}

.viewer-badge .badge-dot {
    width: 5px;
    height: 5px;
    border-radius: 50%;
    animation: pulse-dot 2s ease-in-out infinite;
}

.viewer-hint {
    position: absolute;
    bottom: 16px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 5px 14px;
    border-radius: 20px;
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-dim);
    font-size: 10px;
    color: var(--text-muted);
    z-index: 5;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.sensor-card:hover .viewer-hint {
    opacity: 1;
}

.viewer-hint svg {
    width: 14px;
    height: 14px;
    animation: rotate-hint 3s ease-in-out infinite;
}

@keyframes rotate-hint {
    0%, 100% { transform: rotate(0deg); }
    25% { transform: rotate(15deg); }
    75% { transform: rotate(-15deg); }
}

/* ── Sensor Info Panel ─────────────────────────────────────── */
.sensor-info {
    padding: 48px 40px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
}

.sensor-number {
    font-size: 14px;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--text-secondary);
    letter-spacing: 2px;
    margin-bottom: 12px;
}

.sensor-name {
    font-size: 40px;
    font-weight: 800;
    letter-spacing: -1px;
    margin-bottom: 10px;
    line-height: 1.2;
}

.sensor-purpose {
    font-size: 18px;
    color: var(--text-primary);
    margin-bottom: 28px;
    line-height: 1.7;
}

.sensor-specs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: 24px;
}

.spec-card {
    padding: 14px 16px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-dim);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.spec-card:hover {
    background: rgba(74, 222, 128, 0.04);
    border-color: var(--border-accent);
}

.spec-label {
    font-size: 12px;
    font-weight: 700;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 6px;
}

.spec-value {
    font-size: 24px;
    font-weight: 800;
    font-family: var(--font-mono);
}

.spec-unit {
    font-size: 14px;
    font-weight: 400;
    color: var(--text-secondary);
    margin-left: 4px;
}

.sensor-importance {
    padding: 16px 18px;
    background: var(--gradient-card);
    border: 1px solid var(--border-dim);
    border-radius: var(--radius-sm);
    position: relative;
    overflow: hidden;
}

.sensor-importance::before {
    content: '';
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    border-radius: 3px 0 0 3px;
}

.sensor-importance .importance-label {
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 8px;
}

.sensor-importance p {
    font-size: 17px;
    color: var(--text-primary);
    line-height: 1.75;
}

/* Sensor-specific accent colors */
.sensor-card[data-sensor="temperature"] { --sensor-color: #fb923c; }
.sensor-card[data-sensor="humidity"] { --sensor-color: #22d3ee; }
.sensor-card[data-sensor="soil_moisture"] { --sensor-color: #a78bfa; }
.sensor-card[data-sensor="wind_speed"] { --sensor-color: #4ade80; }
.sensor-card[data-sensor="light"] { --sensor-color: #fbbf24; }
.sensor-card[data-sensor="soil_ph"] { --sensor-color: #34d399; }
.sensor-card[data-sensor="rainfall"] { --sensor-color: #3b82f6; }
.sensor-card[data-sensor="co2"] { --sensor-color: #fb7185; }

.sensor-card .sensor-name {
    color: var(--sensor-color, var(--text-primary));
}

.sensor-card .spec-value {
    color: var(--sensor-color, var(--text-primary));
}

.sensor-card .sensor-importance::before {
    background: var(--sensor-color, var(--accent-green));
}

.sensor-card .sensor-importance .importance-label {
    color: var(--sensor-color, var(--accent-green));
}

.sensor-card .viewer-badge .badge-dot {
    background: var(--sensor-color, var(--accent-green));
}

/* ── Footer ────────────────────────────────────────────────── */
.page-footer {
    padding: 40px 32px;
    text-align: center;
    border-top: 1px solid var(--border-dim);
    background: var(--bg-glass);
}

.footer-text {
    font-size: 13px;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

.footer-text a {
    color: var(--accent-green);
    text-decoration: none;
    font-weight: 600;
    transition: color var(--transition-fast);
}

.footer-text a:hover {
    color: var(--accent-cyan);
}

/* ── Responsive ────────────────────────────────────────────── */
@media (max-width: 1024px) {
    .sensor-card {
        grid-template-columns: 1fr;
    }
    .sensor-card:nth-child(even) {
        direction: rtl;
    }
    .sensor-card:nth-child(even) .viewer-badge {
        right: 16px;
        left: auto;
    }
    .sensor-viewer {
        min-height: 350px;
    }
    .sensor-info {
        padding: 32px 28px;
    }
    .hero {
        padding: 80px 24px 60px;
    }
}

@media (max-width: 768px) {
    #top-nav {
        padding: 10px 16px;
    }
    .brand-tag {
        display: none;
    }
    .hero h1 {
        letter-spacing: -1px;
    }
    .hero-stats {
        gap: 24px;
    }
    .hero-stat-value {
        font-size: 26px;
    }
    .hero-divider {
        height: 30px;
    }
    .sensors-section {
        padding: 20px 16px 80px;
    }
    .sensor-card {
        margin-bottom: 32px;
        border-radius: var(--radius-md);
    }
    .sensor-viewer {
        min-height: 300px;
    }
    .sensor-info {
        padding: 24px 20px;
    }
    .sensor-name {
        font-size: 26px;
    }
    .sensor-specs {
        grid-template-columns: 1fr 1fr;
    }
    .nav-btn span {
        display: none;
    }
    .nav-btn {
        padding: 8px 12px;
    }
}

@media (max-width: 480px) {
    .hero-stats {
        flex-wrap: wrap;
        gap: 16px;
    }
    .hero-divider {
        display: none;
    }
    .sensor-specs {
        grid-template-columns: 1fr;
    }
    .sensor-viewer {
        min-height: 260px;
    }
}

/* ── Utility ───────────────────────────────────────────────── */
.hidden {
    display: none !important;
}