/* ============================================
   CORE DESIGN SYSTEM
   ============================================ */

:root {
    --bg-primary: #fbfaf7;
    --bg-secondary: #f0f4f1;
    --bg-tertiary: #e4ebe7;
    --surface: rgba(255, 255, 255, 0.78);
    --surface-strong: #ffffff;
    --text-primary: #111827;
    --text-secondary: #43515f;
    --text-tertiary: #71808f;
    --accent-primary: #0f8b8d;
    --accent-secondary: #ff6b4a;
    --accent-tertiary: #f4c430;
    --border-color: rgba(17, 24, 39, 0.12);
    --ring: rgba(15, 139, 141, 0.18);
    --shadow-sm: 0 1px 2px rgba(17, 24, 39, 0.06);
    --shadow-md: 0 12px 30px rgba(17, 24, 39, 0.08);
    --shadow-lg: 0 24px 60px rgba(17, 24, 39, 0.12);
    --shadow-xl: 0 34px 90px rgba(17, 24, 39, 0.16);

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'SFMono-Regular', 'Cascadia Code', 'Fira Code', monospace;

    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 420ms ease;
}

[data-theme="dark"] {
    --bg-primary: #071013;
    --bg-secondary: #0f1a1d;
    --bg-tertiary: #172528;
    --surface: rgba(12, 22, 25, 0.78);
    --surface-strong: #0b171a;
    --text-primary: #f6f2ea;
    --text-secondary: #ccd7d8;
    --text-tertiary: #8ea2a5;
    --accent-primary: #2dd4bf;
    --accent-secondary: #ff8a65;
    --accent-tertiary: #ffd166;
    --border-color: rgba(246, 242, 234, 0.14);
    --ring: rgba(45, 212, 191, 0.18);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.32);
    --shadow-md: 0 12px 30px rgba(0, 0, 0, 0.36);
    --shadow-lg: 0 24px 60px rgba(0, 0, 0, 0.42);
    --shadow-xl: 0 34px 90px rgba(0, 0, 0, 0.52);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    min-height: 100vh;
    font-family: var(--font-primary);
    background:
        linear-gradient(120deg, rgba(15, 139, 141, 0.08), transparent 34%),
        linear-gradient(300deg, rgba(255, 107, 74, 0.09), transparent 38%),
        var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color var(--transition-base), color var(--transition-base);
}

body::selection {
    background: var(--accent-primary);
    color: #fff;
}

.skip-link {
    position: fixed;
    top: 1rem;
    left: 1rem;
    z-index: 10000;
    transform: translateY(-150%);
    background: var(--text-primary);
    color: var(--bg-primary);
    padding: 0.7rem 1rem;
    border-radius: var(--radius-md);
    transition: transform var(--transition-fast);
}

.skip-link:focus {
    transform: translateY(0);
}

h1, h2, h3, h4, h5, h6 {
    color: var(--text-primary);
    font-weight: 800;
    line-height: 1.04;
    margin-bottom: var(--spacing-sm);
    text-wrap: balance;
}

h1 { font-size: clamp(2.6rem, 7vw, 6.8rem); }
h2 { font-size: clamp(2rem, 4vw, 4rem); }
h3 { font-size: clamp(1.25rem, 2vw, 1.75rem); }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.1rem; }
h6 { font-size: 1rem; }

p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color var(--transition-fast), transform var(--transition-fast);
}

a:hover {
    color: var(--accent-secondary);
}

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

main {
    position: relative;
}

.container,
.container-wide {
    width: min(100% - 2rem, 1180px);
    margin: 0 auto;
}

.container-wide {
    width: min(100% - 2rem, 1440px);
}

.section {
    padding: var(--spacing-3xl) 0;
}

.section-alt {
    background:
        linear-gradient(180deg, transparent, rgba(15, 139, 141, 0.04)),
        var(--bg-secondary);
}

.page-hero {
    padding: 9rem 0 var(--spacing-2xl);
    position: relative;
    overflow: hidden;
}

.section-heading {
    max-width: 820px;
    margin-bottom: var(--spacing-xl);
}

.section-heading.text-center,
.text-center .section-heading {
    margin-left: auto;
    margin-right: auto;
}

.section-heading p {
    max-width: 690px;
    font-size: 1.08rem;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    color: var(--accent-primary);
    font-size: 0.78rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: var(--spacing-sm);
}

.text-center { text-align: center; }
.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-tertiary { color: var(--text-tertiary); }

.text-gradient {
    background: linear-gradient(110deg, var(--accent-primary), var(--accent-secondary), var(--accent-tertiary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }
.mb-xs { margin-bottom: var(--spacing-xs); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

/* ============================================
   NAVIGATION
   ============================================ */

.navbar {
    position: fixed;
    inset: 0 0 auto;
    z-index: 1000;
    padding: 0.85rem 0;
    border-bottom: 1px solid var(--border-color);
    background: color-mix(in srgb, var(--bg-primary) 82%, transparent);
    backdrop-filter: blur(18px) saturate(140%);
    transition: all var(--transition-base);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-container {
    width: min(100% - 2rem, 1180px);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
}

.nav-brand {
    display: inline-flex;
    align-items: center;
    gap: 0.7rem;
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 900;
}

.nav-brand-mark {
    width: 2.35rem;
    height: 2.35rem;
    display: grid;
    place-items: center;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: #fff;
    box-shadow: var(--shadow-sm);
}

.nav-menu {
    list-style: none;
    display: flex;
    align-items: center;
    gap: 0.45rem;
}

.nav-link,
.nav-availability {
    min-height: 2.35rem;
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    color: var(--text-secondary);
    font-size: 0.92rem;
    font-weight: 700;
    padding: 0.55rem 0.8rem;
    border-radius: var(--radius-md);
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

.nav-link.active::after {
    content: '';
    width: 0.35rem;
    height: 0.35rem;
    border-radius: 50%;
    background: var(--accent-secondary);
    margin-left: 0.1rem;
}

.nav-availability {
    border: 1px solid var(--border-color);
    background: var(--surface);
    color: var(--text-primary);
}

.availability-dot {
    width: 0.58rem;
    height: 0.58rem;
    display: inline-block;
    border-radius: 50%;
    background: #34d399;
    box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.58);
    animation: status-pulse 2.4s ease-out infinite;
}

@keyframes status-pulse {
    70% { box-shadow: 0 0 0 0.55rem rgba(52, 211, 153, 0); }
    100% { box-shadow: 0 0 0 0 rgba(52, 211, 153, 0); }
}

.theme-toggle,
.mobile-menu-toggle,
.command-trigger {
    border: 1px solid var(--border-color);
    background: var(--surface);
    color: var(--text-primary);
    cursor: pointer;
}

.command-trigger {
    min-height: 2.35rem;
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.48rem 0.72rem;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-weight: 800;
}

.command-trigger span {
    display: grid;
    place-items: center;
    width: 1.35rem;
    height: 1.35rem;
    border-radius: var(--radius-sm);
    background: var(--text-primary);
    color: var(--bg-primary);
    font-family: var(--font-mono);
}

.command-trigger:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.theme-toggle {
    width: 2.35rem;
    height: 2.35rem;
    border-radius: var(--radius-md);
    display: grid;
    place-items: center;
    transition: transform var(--transition-fast), background var(--transition-fast);
}

.theme-toggle:hover {
    transform: translateY(-2px) rotate(12deg);
    background: var(--bg-tertiary);
}

.theme-toggle svg {
    width: 1.15rem;
    height: 1.15rem;
}

.mobile-menu-toggle {
    display: none;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: var(--radius-md);
    padding: 0.5rem;
}

.mobile-menu-toggle span {
    display: block;
    width: 1.25rem;
    height: 2px;
    margin: 4px auto;
    border-radius: 999px;
    background: currentColor;
    transition: all var(--transition-fast);
}

/* ============================================
   BUTTONS / CARDS / GRID
   ============================================ */

.btn {
    min-height: 2.9rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.45rem;
    padding: 0.78rem 1.2rem;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    font-family: var(--font-primary);
    font-size: 0.96rem;
    font-weight: 800;
    cursor: pointer;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast);
}

.btn:hover {
    transform: translateY(-2px);
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: #fff;
    box-shadow: 0 14px 28px var(--ring);
}

.btn-primary:hover {
    color: #fff;
    box-shadow: 0 18px 36px var(--ring);
}

.btn-secondary {
    background: var(--surface);
    color: var(--text-primary);
    border-color: var(--border-color);
}

.btn-secondary:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

.btn-outline {
    background: transparent;
    color: var(--accent-primary);
    border-color: color-mix(in srgb, var(--accent-primary) 60%, var(--border-color));
}

.btn-outline:hover {
    background: var(--accent-primary);
    color: #fff;
}

.btn-lg {
    min-height: 3.2rem;
    padding-inline: 1.5rem;
}

.card,
.contact-panel,
.project-spec,
.contact-form-panel {
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.card {
    padding: var(--spacing-lg);
    transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: color-mix(in srgb, var(--accent-primary) 44%, var(--border-color));
}

.grid {
    display: grid;
    gap: var(--spacing-lg);
}

.grid-2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); }

.badge {
    display: inline-flex;
    align-items: center;
    min-height: 1.75rem;
    padding: 0.22rem 0.58rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 800;
}

.badge-primary {
    background: var(--accent-primary);
    color: #fff;
}

.badge-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.badge-success {
    background: #10b981;
    color: #fff;
}

.messages-container {
    position: fixed;
    top: 5.5rem;
    right: 1.25rem;
    z-index: 9999;
    width: min(22rem, calc(100vw - 2rem));
}

.notification {
    background: var(--surface-strong);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--accent-primary);
    padding: 1rem 1.1rem;
    border-radius: var(--radius-md);
    margin-bottom: 0.6rem;
    box-shadow: var(--shadow-lg);
    animation: slideInRight 0.3s ease;
}

/* ============================================
   COMMAND PALETTE
   ============================================ */

.command-palette {
    position: fixed;
    inset: 0;
    z-index: 10000;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
}

.command-palette.active {
    opacity: 1;
    visibility: visible;
}

.command-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.46);
    backdrop-filter: blur(8px);
}

.command-dialog {
    position: relative;
    width: min(720px, calc(100vw - 1.5rem));
    max-height: min(720px, calc(100vh - 2rem));
    margin: 6rem auto 0;
    display: grid;
    overflow: hidden;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    background: var(--surface-strong);
    box-shadow: var(--shadow-xl);
    transform: translateY(1rem) scale(0.98);
    transition: transform var(--transition-base);
}

.command-palette.active .command-dialog {
    transform: translateY(0) scale(1);
}

.command-header,
.command-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.command-header h2 {
    font-size: 1.2rem;
    margin: 0;
}

.command-kicker {
    color: var(--accent-primary);
    font-size: 0.72rem;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin: 0 0 0.2rem;
}

.command-close {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--text-primary);
    padding: 0.5rem 0.7rem;
    cursor: pointer;
    font-weight: 800;
}

.command-search {
    display: grid;
    gap: 0.45rem;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    color: var(--text-tertiary);
    font-size: 0.74rem;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.command-search input {
    width: 100%;
    min-height: 3.25rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    color: var(--text-primary);
    padding: 0.9rem 1rem;
    font: inherit;
    font-size: 1rem;
    text-transform: none;
    letter-spacing: 0;
}

.command-search input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 4px var(--ring);
}

.command-results {
    max-height: 420px;
    overflow-y: auto;
    padding: var(--spacing-sm);
}

.command-result {
    width: 100%;
    display: grid;
    grid-template-columns: 5.5rem 1fr;
    gap: 0.2rem var(--spacing-sm);
    align-items: center;
    padding: 0.85rem;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    background: transparent;
    color: var(--text-primary);
    text-align: left;
    cursor: pointer;
}

.command-result strong {
    font-size: 0.98rem;
}

.command-result small {
    grid-column: 2;
    color: var(--text-tertiary);
    font-weight: 700;
}

.command-result.active,
.command-result:hover {
    background: var(--bg-secondary);
    border-color: var(--border-color);
}

.command-type {
    grid-row: span 2;
    color: var(--accent-primary);
    font-size: 0.72rem;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.command-empty {
    padding: var(--spacing-lg);
    color: var(--text-secondary);
    text-align: center;
}

.command-footer {
    border-top: 1px solid var(--border-color);
    border-bottom: 0;
    color: var(--text-tertiary);
    font-size: 0.78rem;
    font-weight: 800;
}

kbd {
    display: inline-grid;
    place-items: center;
    min-width: 1.55rem;
    min-height: 1.35rem;
    padding: 0 0.32rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.72rem;
}

.rich-text {
    color: var(--text-secondary);
}

.rich-text p,
.rich-text li {
    color: var(--text-secondary);
}

.rich-text ul,
.rich-text ol {
    padding-left: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

.skeleton {
    background: linear-gradient(90deg, var(--bg-secondary) 25%, var(--bg-tertiary) 50%, var(--bg-secondary) 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
    border-radius: var(--radius-md);
}

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

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 900px) {
    .nav-menu {
        position: fixed;
        top: 4.2rem;
        left: 1rem;
        right: 1rem;
        display: grid;
        gap: 0.5rem;
        padding: var(--spacing-sm);
        background: var(--surface-strong);
        border: 1px solid var(--border-color);
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow-xl);
        opacity: 0;
        visibility: hidden;
        transform: translateY(-0.7rem);
        transition: all var(--transition-base);
    }

    .nav-menu.active {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

    .nav-link,
    .nav-availability,
    .command-trigger {
        width: 100%;
        justify-content: space-between;
    }

    .mobile-menu-toggle {
        display: block;
    }

    .section {
        padding: var(--spacing-2xl) 0;
    }

    .page-hero {
        padding-top: 7.5rem;
    }
}

@media (max-width: 640px) {
    .container,
    .container-wide,
    .nav-container {
        width: min(100% - 1.25rem, 1180px);
    }

    .nav-brand span:last-child {
        max-width: 11rem;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

    .btn {
        width: 100%;
    }

    .command-dialog {
        margin-top: 1rem;
    }

    .command-footer {
        display: none;
    }

    .command-result {
        grid-template-columns: 1fr;
    }

    .command-result small,
    .command-type {
        grid-column: auto;
        grid-row: auto;
    }

    .hero-cta,
    .project-action-row,
    .profile-actions {
        width: 100%;
    }
}