/* ============================================
   OSMIO AI – Design System
   Dark, professional, indigo/violet palette
   ============================================ */

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

:root {
    /* Colors */
    --bg-base:       #080810;
    --bg-surface:    #0d0d1a;
    --bg-card:       rgba(255, 255, 255, 0.04);
    --bg-card-hover: rgba(255, 255, 255, 0.07);
    --border:        rgba(255, 255, 255, 0.08);
    --border-hover:  rgba(99, 102, 241, 0.4);

    /* Brand gradient */
    --indigo:  #6366F1;
    --violet:  #8B5CF6;
    --blue:    #3B82F6;

    /* Text */
    --text-primary:   #F1F1F8;
    --text-secondary: #8888AA;
    --text-muted:     #44445A;

    /* Spacing */
    --section-gap: 7rem;
    --container:   1100px;
    --radius:      12px;
    --radius-lg:   20px;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-base);
    color: var(--text-primary);
    font-family: 'Inter', system-ui, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
    text-decoration: none;
}

img {
    max-width: 100%;
    display: block;
}

/* ---------- Layout ---------- */
.container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 2rem;
}

section {
    padding: var(--section-gap) 0;
}

/* ---------- Typography ---------- */
.gradient-text {
    background: linear-gradient(135deg, var(--indigo), var(--violet));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--indigo);
    margin-bottom: 1rem;
}

.section-title {
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 560px;
    line-height: 1.7;
}

/* ---------- Navbar ---------- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 1.25rem 0;
    transition: background 0.3s, border-color 0.3s, padding 0.3s;
    border-bottom: 1px solid transparent;
}

.navbar.scrolled {
    background: rgba(8, 8, 16, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom-color: var(--border);
    padding: 0.9rem 0;
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 1.05rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    color: var(--text-primary);
}

.nav-logo svg {
    flex-shrink: 0;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-links a {
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--text-primary);
}

.nav-cta {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary) !important;
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 0.5rem 1.1rem;
    border-radius: 8px;
    transition: border-color 0.2s, background 0.2s !important;
}

.nav-cta:hover {
    border-color: var(--border-hover) !important;
    background: var(--bg-card-hover) !important;
}

/* Mobile menu */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    background: none;
    border: none;
    padding: 4px;
}

.mobile-menu-btn span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text-secondary);
    border-radius: 2px;
    transition: all 0.3s;
}

.mobile-menu-btn.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.mobile-menu-btn.active span:nth-child(2) { opacity: 0; }
.mobile-menu-btn.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-menu {
    display: none;
    flex-direction: column;
    gap: 0;
    background: rgba(8, 8, 16, 0.96);
    backdrop-filter: blur(20px);
    border-top: 1px solid var(--border);
    padding: 1rem 2rem;
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    z-index: 99;
}

.mobile-menu.active {
    display: flex;
}

.mobile-menu a {
    padding: 0.85rem 0;
    font-size: 1rem;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border);
    transition: color 0.2s;
}

.mobile-menu a:last-child {
    border-bottom: none;
}

.mobile-menu a:hover {
    color: var(--text-primary);
}

/* ---------- Hero ---------- */
.hero {
    padding: calc(var(--section-gap) + 5rem) 0 var(--section-gap);
    position: relative;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 0;
}

.hero-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.15;
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: var(--indigo);
    top: -200px;
    right: -100px;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: var(--violet);
    bottom: -100px;
    left: -100px;
    opacity: 0.1;
}

/* Subtle grid overlay */
.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(99,102,241,0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99,102,241,0.05) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at 70% 40%, black 30%, transparent 80%);
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 700px;
}

.hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--indigo);
    border: 1px solid rgba(99,102,241,0.25);
    border-radius: 100px;
    padding: 0.35rem 0.85rem;
    background: rgba(99,102,241,0.06);
    margin-bottom: 1.5rem;
}

.hero-eyebrow::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--indigo);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50%       { opacity: 0.5; transform: scale(0.7); }
}

.hero-title {
    font-size: clamp(2.6rem, 6vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 1.5rem;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    line-height: 1.75;
    margin-bottom: 2.5rem;
    max-width: 560px;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 1.6rem;
    background: linear-gradient(135deg, var(--indigo), var(--violet));
    color: #fff;
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: 10px;
    border: none;
    cursor: pointer;
    transition: opacity 0.2s, transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 20px rgba(99,102,241,0.3);
}

.btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-1px);
    box-shadow: 0 8px 30px rgba(99,102,241,0.4);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 1.6rem;
    background: var(--bg-card);
    color: var(--text-primary);
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: 10px;
    border: 1px solid var(--border);
    cursor: pointer;
    transition: background 0.2s, border-color 0.2s, transform 0.2s;
}

.btn-secondary:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    transform: translateY(-1px);
}

/* ---------- About ---------- */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-text .section-subtitle {
    margin-bottom: 2rem;
}

.about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-top: 2rem;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.3rem;
    transition: border-color 0.2s;
}

.stat-card:hover {
    border-color: var(--border-hover);
}

.stat-card-value {
    font-size: 1.8rem;
    font-weight: 800;
    letter---spacing: -0.03em;
}

.stat-card-label {
    font-size: 0.82rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.about-visual {
    position: relative;
}

.about-visual-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    position: relative;
    overflow: hidden;
}

.about-visual-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(99,102,241,0.5), transparent);
}

.about-terminal {
    font-family: 'Fira Code', 'Courier New', monospace;
    font-size: 0.82rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

.about-terminal .t-prompt {
    color: var(--indigo);
}

.about-terminal .t-cmd {
    color: var(--text-primary);
}

.about-terminal .t-output {
    color: #4ade80;
}

.about-terminal .t-comment {
    color: var(--text-muted);
}

/* ---------- Capabilities ---------- */
.capabilities {
    background: var(--bg-surface);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.capabilities-header {
    text-align: center;
    margin-bottom: 3.5rem;
}

.capabilities-header .section-subtitle {
    margin: 0 auto;
}

.cap-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
}

.cap-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.75rem;
    display: flex;
    gap: 1.25rem;
    align-items: flex-start;
    transition: background 0.2s, border-color 0.2s, transform 0.2s;
}

.cap-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.cap-icon {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    background: rgba(99,102,241,0.1);
    border: 1px solid rgba(99,102,241,0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.cap-icon svg {
    color: var(--indigo);
}

.cap-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.35rem;
    letter-spacing: -0.01em;
}

.cap-desc {
    font-size: 0.87rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ---------- Projects ---------- */
.projects-header {
    margin-bottom: 3rem;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    transition: background 0.2s, border-color 0.2s, transform 0.25s;
    position: relative;
    overflow: hidden;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--indigo), var(--violet));
    opacity: 0;
    transition: opacity 0.2s;
}

.project-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    transform: translateY(-3px);
}

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

.project-card.featured {
    grid-column: span 2;
    flex-direction: row;
    align-items: center;
    gap: 2.5rem;
    padding: 2.5rem;
}

.project-card.featured::before {
    opacity: 1;
}

.project-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--indigo);
    background: rgba(99,102,241,0.1);
    border: 1px solid rgba(99,102,241,0.2);
    border-radius: 100px;
    padding: 0.25rem 0.7rem;
}

.project-title {
    font-size: 1.35rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.project-desc {
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.65;
    flex: 1;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    font-size: 0.75rem;
    color: var(--text-secondary);
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 0.2rem 0.6rem;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--indigo);
    transition: gap 0.2s;
}

.project-link:hover {
    gap: 0.7rem;
}

.project-featured-info {
    flex: 1;
}

.project-featured-visual {
    flex-shrink: 0;
    width: 280px;
    background: rgba(99,102,241,0.06);
    border: 1px solid rgba(99,102,241,0.15);
    border-radius: var(--radius);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.mini-metric {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.82rem;
}

.mini-metric-label {
    color: var(--text-secondary);
}

.mini-metric-value {
    font-weight: 600;
    color: var(--text-primary);
}

.mini-bar {
    height: 4px;
    background: rgba(255,255,255,0.06);
    border-radius: 2px;
    overflow: hidden;
}

.mini-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--indigo), var(--violet));
    border-radius: 2px;
}

/* ---------- Contact / CTA ---------- */
.cta-section {
    padding: var(--section-gap) 0;
}

.cta-box {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 4rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-box::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(99,102,241,0.6), transparent);
}

.cta-box .section-title {
    margin-bottom: 1rem;
}

.cta-box .section-subtitle {
    margin: 0 auto 2rem;
    text-align: center;
}

.cta-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

/* ---------- Footer ---------- */
.footer {
    border-top: 1px solid var(--border);
    padding: 3rem 0 2rem;
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 0.95rem;
    font-weight: 700;
}

.footer-nav {
    display: flex;
    gap: 1.75rem;
    flex-wrap: wrap;
}

.footer-nav a {
    font-size: 0.85rem;
    color: var(--text-secondary);
    transition: color 0.2s;
}

.footer-nav a:hover {
    color: var(--text-primary);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    border-top: 1px solid var(--border);
    padding-top: 1.5rem;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.tech-stack {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.tech-pill {
    font-size: 0.72rem;
    color: var(--text-muted);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 0.18rem 0.5rem;
}

/* ---------- Scroll Animations ---------- */
.fade-up {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

.fade-up:nth-child(2) { transition-delay: 0.08s; }
.fade-up:nth-child(3) { transition-delay: 0.16s; }
.fade-up:nth-child(4) { transition-delay: 0.24s; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
    .about-grid {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }

    .cap-grid {
        grid-template-columns: 1fr;
    }

    .projects-grid {
        grid-template-columns: 1fr;
    }

    .project-card.featured {
        grid-column: span 1;
        flex-direction: column;
    }

    .project-featured-visual {
        width: 100%;
    }
}

@media (max-width: 700px) {
    :root {
        --section-gap: 4rem;
    }

    .nav-links {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .hero-title {
        font-size: 2.2rem;
    }

    .about-stats {
        grid-template-columns: 1fr 1fr;
    }

    .cta-box {
        padding: 2.5rem 1.5rem;
    }

    .footer-inner {
        flex-direction: column;
        align-items: flex-start;
        gap: 1.5rem;
    }
}

@media (max-width: 480px) {
    .hero-actions {
        flex-direction: column;
    }

    .btn-primary, .btn-secondary {
        justify-content: center;
    }
}