:root {
    --bg-primary: #070B14;
    --bg-secondary: #0F172A;
    --bg-card: rgba(15, 23, 42, 0.75);
    --border-color: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(6, 182, 212, 0.4);
    --text-main: #F8FAFC;
    --text-muted: #94A3B8;
    --accent-blue: #3B82F6;
    --accent-cyan: #06B6D4;
    --accent-emerald: #10B981;
    --accent-purple: #8B5CF6;
    --glow-color: rgba(6, 182, 212, 0.2);
    --radius-lg: 18px;
    --radius-md: 12px;
    --radius-sm: 8px;
    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-main);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
    padding: 40px 20px;
}

/* Ambient glow */
.background-glow {
    position: fixed;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    pointer-events: none;
    filter: blur(140px);
    z-index: 0;
}

.background-glow.top-left {
    top: -200px;
    left: -150px;
    background: radial-gradient(circle, rgba(6, 182, 212, 0.22), transparent 70%);
}

.background-glow.bottom-right {
    bottom: -200px;
    right: -150px;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.2), transparent 70%);
}

.container {
    max-width: 920px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    gap: 28px;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 20px 0 10px;
}

.hero-title {
    font-family: 'Outfit', sans-serif;
    font-size: 3.2rem;
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.03em;
    margin-bottom: 12px;
}

.hero-title span {
    background: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-blue) 50%, var(--accent-purple) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    color: var(--text-muted);
    font-size: 1.05rem;
    max-width: 680px;
    margin: 0 auto;
    line-height: 1.6;
}

/* Cards Base */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 32px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
    transition: var(--transition);
}

.card:hover {
    border-color: rgba(255, 255, 255, 0.15);
}

.card-title {
    font-family: 'Outfit', sans-serif;
    font-size: 1.4rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
    color: var(--text-main);
}

.card-desc {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 24px;
    line-height: 1.5;
}

/* Action Buttons */
.action-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-bottom: 24px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px 24px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-blue) 100%);
    color: #ffffff;
    box-shadow: 0 4px 20px var(--glow-color);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(6, 182, 212, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.06);
    color: var(--text-main);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.btn-ghost {
    background: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border-color);
}

.btn-ghost:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-main);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

/* Manifest Box */
.manifest-box {
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 12px 18px;
    display: flex;
    align-items: center;
    gap: 10px;
    overflow: hidden;
}

.manifest-label {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    white-space: nowrap;
}

.manifest-box code {
    color: var(--accent-cyan);
    font-family: monospace;
    font-size: 0.9rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
    text-align: center;
    backdrop-filter: blur(16px);
    transition: var(--transition);
}

.stat-card:hover {
    border-color: rgba(255, 255, 255, 0.15);
    transform: translateY(-2px);
}

.stat-icon {
    color: var(--accent-cyan);
    margin-bottom: 8px;
    display: flex;
    justify-content: center;
}

.stat-value {
    font-family: 'Outfit', sans-serif;
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--text-main);
    margin-bottom: 4px;
}

.stat-label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Instructions & Tabs */
.tabs-header {
    display: flex;
    gap: 8px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 12px;
    margin-bottom: 20px;
    overflow-x: auto;
}

.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 600;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.tab-btn:hover {
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.05);
}

.tab-btn.active {
    color: var(--accent-cyan);
    background: rgba(6, 182, 212, 0.12);
    border: 1px solid rgba(6, 182, 212, 0.3);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

.steps-list {
    padding-left: 20px;
    color: var(--text-muted);
    line-height: 1.8;
    font-size: 0.95rem;
}

.steps-list strong {
    color: var(--text-main);
}

/* Developer Profile Card */
.dev-card {
    background: linear-gradient(135deg, rgba(15, 23, 42, 0.85) 0%, rgba(30, 27, 75, 0.4) 100%);
    border: 1px solid rgba(6, 182, 212, 0.25);
}

.dev-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
}

.dev-avatar {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--border-color);
    background: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-blue) 100%);
    color: #FFFFFF;
    font-family: 'Outfit', sans-serif;
    font-weight: 800;
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(6, 182, 212, 0.35);
    flex-shrink: 0;
}

.dev-info {
    display: flex;
    flex-direction: column;
    gap: 3px;
}

.dev-name {
    font-family: 'Outfit', sans-serif;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-main);
}

.dev-tagline {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.dev-socials {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.social-chip {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
    text-decoration: none;
    background: rgba(0, 0, 0, 0.35);
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    transition: var(--transition);
}

.social-chip:hover {
    color: var(--text-main);
    transform: translateY(-2px);
}

.social-chip.portfolio:hover {
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
    background: rgba(6, 182, 212, 0.1);
}

.social-chip.github:hover {
    border-color: #FFFFFF;
    color: #FFFFFF;
    background: rgba(255, 255, 255, 0.1);
}

.social-chip.linkedin:hover {
    border-color: #0A66C2;
    color: #38BDF8;
    background: rgba(10, 102, 194, 0.15);
}

.social-chip.twitter:hover {
    border-color: #1DA1F2;
    color: #1DA1F2;
    background: rgba(29, 161, 242, 0.1);
}

.social-chip.instagram:hover {
    border-color: #E1306C;
    color: #F472B6;
    background: rgba(225, 48, 108, 0.12);
}

.social-chip.email:hover {
    border-color: var(--accent-emerald);
    color: var(--accent-emerald);
    background: rgba(16, 185, 129, 0.12);
}

/* Footer */
.footer {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
    padding: 20px 0;
}

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

.footer a:hover {
    text-decoration: underline;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: #0F172A;
    color: #F8FAFC;
    padding: 12px 24px;
    border-radius: 999px;
    font-size: 0.9rem;
    font-weight: 600;
    border: 1px solid var(--accent-cyan);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 100;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

@media (max-width: 640px) {
    .hero-title { font-size: 2.3rem; }
    .action-buttons { flex-direction: column; }
    .btn { width: 100%; }
}