:root[data-theme='dark'] {
    --bg-main: #000000;
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.6);
    --nav-bg: rgba(255, 255, 255, 0.05);
    --nav-border: rgba(255, 255, 255, 0.1);
    --canvas-border: rgba(255, 255, 255, 0.05);
    --intro-bg: radial-gradient(circle at center, #111 0%, #000 100%);
    --food-bg: linear-gradient(180deg, #1a0b0b 0%, #000 100%);
    --jobs-bg: linear-gradient(180deg, #0b1a13 0%, #000 100%);
    --sooq-bg: linear-gradient(180deg, #0b121a 0%, #000 100%);
    --taxi-bg: linear-gradient(180deg, #1a150b 0%, #000 100%);
}

:root[data-theme='light'] {
    --bg-main: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --nav-bg: rgba(0, 0, 0, 0.03);
    --nav-border: rgba(0, 0, 0, 0.08);
    --canvas-border: rgba(0, 0, 0, 0.05);
    --intro-bg: radial-gradient(circle at center, #f8fafc 0%, #ffffff 100%);
    --food-bg: linear-gradient(180deg, #fff5f5 0%, #ffffff 100%);
    --jobs-bg: linear-gradient(180deg, #f0fff4 0%, #ffffff 100%);
    --sooq-bg: linear-gradient(180deg, #f0f9ff 0%, #ffffff 100%);
    --taxi-bg: linear-gradient(180deg, #fffbeb 0%, #ffffff 100%);
}

:root {
    --food-accent: #ff4d4d;
    --jobs-accent: #10b981;
    --sooq-accent: #0ea5e9;
    --taxi-accent: #f59e0b;
    --transition-cascade: transform 0.8s cubic-bezier(0.645, 0.045, 0.355, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: background-color 0.5s ease, border-color 0.5s ease, color 0.5s ease;
}

body {
    background: var(--bg-main);
    color: var(--text-primary);
    font-family: 'Almarai', sans-serif;
    overflow-x: hidden;
}

/* Sticky Stack Container */
.scene-container { height: 500vh; }

.canvas {
    position: sticky;
    top: 0;
    height: 100vh;
    width: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 4rem;
    overflow: hidden;
    border-bottom: 1px solid var(--canvas-border);
}

.canvas-content { max-width: 900px; z-index: 10; text-align: center; }

.canvas-title {
    font-family: 'Cairo', sans-serif;
    font-size: clamp(3rem, 10vw, 7rem);
    font-weight: 900;
    line-height: 1;
    margin-bottom: 1.5rem;
}

.canvas-subtitle {
    font-size: 1.15rem;
    font-weight: 800;
    letter-spacing: 5px;
    opacity: 0.5;
    margin-bottom: 2rem;
    text-transform: uppercase;
}

.canvas-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 650px;
    margin: 0 auto 3rem;
}

/* Theme Gradients */
.canvas-intro { background: var(--intro-bg); }
.canvas-food { background: var(--food-bg); --accent: var(--food-accent); }
.canvas-jobs { background: var(--jobs-bg); --accent: var(--jobs-accent); }
.canvas-sooq { background: var(--sooq-bg); --accent: var(--sooq-accent); }
.canvas-taxi { background: var(--taxi-bg); --accent: var(--taxi-accent); }

.text-accent { color: var(--accent); }

/* Navigation Dot Styling */
.side-nav {
    position: fixed;
    right: 3rem;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    z-index: 100;
}

.nav-dot {
    width: 6px;
    height: 60px;
    background: var(--canvas-border);
    transition: 0.4s;
    border-radius: 10px;
    position: relative;
    cursor: pointer;
}

.nav-dot.active { background: var(--text-primary); width: 10px; }

.dot-label {
    position: absolute;
    right: 30px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.75rem;
    font-weight: 800;
    opacity: 0;
    white-space: nowrap;
    transition: 0.4s;
    color: var(--text-primary);
}

.nav-dot.active .dot-label { opacity: 0.7; }

/* Buttons */
.btn-cascade {
    padding: 1.25rem 3.5rem;
    border: 1px solid var(--accent);
    color: var(--accent);
    text-decoration: none;
    font-weight: 900;
    border-radius: 100px;
    transition: 0.3s;
    background: var(--nav-bg);
    backdrop-filter: blur(10px);
}

.btn-cascade:hover { background: var(--accent); color: white; transform: translateY(-3px); box-shadow: 0 15px 30px -10px var(--accent); }

/* Theme Toggle Button */
.theme-toggle {
    position: fixed;
    bottom: 3rem;
    left: 3rem;
    width: 64px;
    height: 64px;
    background: var(--nav-bg);
    border: 1px solid var(--nav-border);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 1000;
    color: var(--text-primary);
    backdrop-filter: blur(15px);
    transition: 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.theme-toggle:hover { transform: scale(1.05) rotate(10deg); background: var(--nav-border); }

/* Decorations */
.canvas-decoration {
    position: absolute;
    font-size: 40vh;
    font-weight: 900;
    opacity: 0.05;
    pointer-events: none;
    z-index: 1;
    font-family: 'Cairo', sans-serif;
    color: var(--text-primary);
}

@media (max-width: 1024px) {
    .canvas-title { font-size: 3.5rem; }
    .side-nav { right: 1.5rem; scale: 0.8; }
    .theme-toggle { bottom: 1.5rem; left: 1.5rem; width: 56px; height: 56px; }
    .canvas-decoration { font-size: 25vh; }
}