/* ============================================================
   DK OctoBot — Scroll-Driven Frame Sequence Landing Page
   Design System & Styles
   ============================================================ */

/* ── CSS Custom Properties ── */
:root {
    /* Colors */
    --c-bg:            #050510;
    --c-bg-card:       rgba(255, 255, 255, 0.03);
    --c-bg-card-hover: rgba(255, 255, 255, 0.06);
    --c-border:        rgba(255, 255, 255, 0.06);
    --c-border-hover:  rgba(0, 229, 255, 0.2);
    --c-text:          #e0e0e0;
    --c-text-muted:    #888;
    --c-heading:       #ffffff;
    --c-accent-1:      #00e5ff;
    --c-accent-2:      #7c4dff;
    --c-accent-3:      #00e676;

    /* Typography */
    --f-heading: 'Inter', 'Cairo', sans-serif;
    --f-body:    'Inter', 'Cairo', sans-serif;

    /* Spacing */
    --sp-xs:  0.5rem;
    --sp-sm:  1rem;
    --sp-md:  2rem;
    --sp-lg:  4rem;
    --sp-xl:  6rem;
    --sp-2xl: 10rem;

    /* Radius */
    --r-sm: 8px;
    --r-md: 16px;
    --r-lg: 24px;
    --r-xl: 32px;

    /* Transitions */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: auto; /* Lenis handles this */
}

body {
    font-family: var(--f-body);
    background: var(--c-bg);
    color: var(--c-text);
    line-height: 1.6;
    overflow-x: hidden;
    direction: ltr; /* Canvas animation reads LTR */
}

/* ============================================================
   PRELOADER
   ============================================================ */
#preloader {
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: var(--c-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.6s var(--ease-out), visibility 0.6s;
}

#preloader.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.preloader-inner {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.preloader-logo svg {
    animation: preloaderPulse 2s ease-in-out infinite;
}

@keyframes preloaderPulse {
    0%, 100% { transform: scale(1); opacity: 0.8; }
    50%      { transform: scale(1.1); opacity: 1; }
}

.preloader-text {
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--c-text-muted);
}

.preloader-bar-track {
    width: 200px;
    height: 3px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 3px;
    overflow: hidden;
}

.preloader-bar-fill {
    width: 0%;
    height: 100%;
    background: linear-gradient(90deg, var(--c-accent-1), var(--c-accent-2));
    border-radius: 3px;
    transition: width 0.15s ease;
}

.preloader-percent {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--c-accent-1), var(--c-accent-2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-variant-numeric: tabular-nums;
}

/* ============================================================
   HERO SECTION (Canvas Area)
   ============================================================ */
#hero-section {
    position: relative;
    width: 100%;
    height: 400vh; /* Scroll height for the animation */
}

#hero-canvas {
    position: sticky;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    display: block;
}

#hero-fallback {
    position: sticky;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    object-fit: cover;
}

/* ── Hero Overlay Content ── */
.hero-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
    z-index: 10;
}

.hero-content {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.25rem;
}

/* Badge */
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1.25rem;
    background: rgba(0, 229, 255, 0.08);
    border: 1px solid rgba(0, 229, 255, 0.15);
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--c-accent-1);
    backdrop-filter: blur(12px);
    opacity: 0;
    transform: translateY(20px);
}

.badge-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--c-accent-1);
    animation: dotPulse 2s ease-in-out infinite;
}

@keyframes dotPulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(0, 229, 255, 0.5); }
    50%      { box-shadow: 0 0 0 6px rgba(0, 229, 255, 0); }
}

/* Title */
.hero-title {
    font-family: var(--f-heading);
    font-size: clamp(3.5rem, 10vw, 8rem);
    font-weight: 900;
    line-height: 0.95;
    color: var(--c-heading);
    opacity: 0;
    transform: translateY(40px);
}

.title-line {
    display: block;
}

.title-accent {
    background: linear-gradient(135deg, var(--c-accent-1) 0%, var(--c-accent-2) 50%, var(--c-accent-1) 100%);
    background-size: 200% auto;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: shimmer 4s linear infinite;
}

@keyframes shimmer {
    0%   { background-position: 0% center; }
    100% { background-position: 200% center; }
}

/* Subtitle */
.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.35rem);
    font-weight: 300;
    color: var(--c-text-muted);
    max-width: 500px;
    opacity: 0;
    transform: translateY(20px);
}

/* ── Scroll Indicator ── */
.scroll-indicator {
    position: fixed;
    bottom: 2.5rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    z-index: 10;
    opacity: 0;
    transition: opacity 0.5s var(--ease-out);
}

.scroll-indicator.visible {
    opacity: 1;
}

.scroll-indicator span {
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--c-text-muted);
}

.scroll-mouse {
    width: 24px;
    height: 38px;
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    position: relative;
}

.scroll-dot {
    width: 4px;
    height: 8px;
    background: var(--c-accent-1);
    border-radius: 4px;
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    animation: scrollDot 2s ease-in-out infinite;
}

@keyframes scrollDot {
    0%, 100% { top: 6px; opacity: 1; }
    50%      { top: 22px; opacity: 0.3; }
}

/* ============================================================
   CONTENT SECTIONS
   ============================================================ */
.content-section {
    position: relative;
    padding: var(--sp-2xl) var(--sp-md);
    overflow: hidden;
}

.section-inner {
    max-width: 1100px;
    margin: 0 auto;
}

/* Section Label */
.section-label {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--c-accent-1);
    margin-bottom: var(--sp-md);
}

.label-line {
    display: inline-block;
    width: 40px;
    height: 1px;
    background: var(--c-accent-1);
}

/* Section Title */
.section-title {
    font-family: var(--f-heading);
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800;
    line-height: 1.15;
    color: var(--c-heading);
    margin-bottom: var(--sp-sm);
}

.text-gradient {
    background: linear-gradient(135deg, var(--c-accent-1), var(--c-accent-2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Section Description */
.section-description {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--c-text-muted);
    max-width: 600px;
    margin-bottom: var(--sp-lg);
}

/* ── Features Grid ── */
.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.feature-card {
    position: relative;
    padding: 2rem;
    background: var(--c-bg-card);
    border: 1px solid var(--c-border);
    border-radius: var(--r-lg);
    transition: all 0.5s var(--ease-out);
    overflow: hidden;
    opacity: 0;
    transform: translateY(40px);
}

.feature-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(
        300px circle at var(--mouse-x, 50%) var(--mouse-y, 50%),
        rgba(0, 229, 255, 0.06),
        transparent 60%
    );
    opacity: 0;
    transition: opacity 0.4s ease;
    pointer-events: none;
}

.feature-card:hover {
    background: var(--c-bg-card-hover);
    border-color: var(--c-border-hover);
    transform: translateY(-4px);
}

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

.feature-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--r-md);
    background: rgba(0, 229, 255, 0.06);
    color: var(--c-accent-1);
    margin-bottom: 1.25rem;
    transition: background 0.3s ease;
}

.feature-card:hover .feature-icon {
    background: rgba(0, 229, 255, 0.12);
}

.feature-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--c-heading);
    margin-bottom: 0.5rem;
}

.feature-card p {
    font-size: 0.9rem;
    color: var(--c-text-muted);
    line-height: 1.7;
}

/* ── CTA Section ── */
.cta-inner {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
}

.cta-glow {
    position: absolute;
    width: 500px;
    height: 500px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(0, 229, 255, 0.08) 0%, transparent 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
    animation: ctaGlowPulse 4s ease-in-out infinite;
}

@keyframes ctaGlowPulse {
    0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.6; }
    50%      { transform: translate(-50%, -50%) scale(1.15); opacity: 1; }
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    margin-top: var(--sp-sm);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.85rem 2rem;
    border-radius: 100px;
    font-size: 0.9rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.35s var(--ease-out);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: linear-gradient(135deg, var(--c-accent-1), var(--c-accent-2));
    color: #050510;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0, 229, 255, 0.25);
}

.btn-secondary {
    background: transparent;
    color: var(--c-text);
    border: 1px solid rgba(255, 255, 255, 0.15);
}

.btn-secondary:hover {
    border-color: var(--c-accent-1);
    color: var(--c-accent-1);
    transform: translateY(-2px);
}

/* ============================================================
   FOOTER
   ============================================================ */
#site-footer {
    padding: var(--sp-lg) var(--sp-md);
    border-top: 1px solid var(--c-border);
}

.footer-inner {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.footer-logo {
    font-size: 1.15rem;
    font-weight: 800;
    color: var(--c-heading);
}

.footer-brand p {
    font-size: 0.8rem;
    color: var(--c-text-muted);
    margin-top: 0.25rem;
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a {
    font-size: 0.85rem;
    color: var(--c-text-muted);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: var(--c-accent-1);
}

.footer-copy {
    font-size: 0.75rem;
    color: var(--c-text-muted);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 768px) {
    .features-grid {
        grid-template-columns: 1fr;
    }

    .hero-title {
        font-size: clamp(2.5rem, 12vw, 4.5rem);
    }

    .cta-buttons {
        flex-direction: column;
    }

    .footer-inner {
        flex-direction: column;
        text-align: center;
    }

    .footer-links {
        justify-content: center;
    }

    .content-section {
        padding: var(--sp-xl) var(--sp-sm);
    }
}

@media (max-width: 480px) {
    .hero-badge {
        font-size: 0.65rem;
        padding: 0.4rem 1rem;
    }

    .section-title {
        font-size: clamp(1.5rem, 6vw, 2.2rem);
    }

    .feature-card {
        padding: 1.5rem;
    }
}