/* ==========================================================================
   DESIGN SYSTEM & THEME CONSTANTS
   ========================================================================== */

:root {
    /* Fonts */
    --font-heading: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-code: 'Fira Code', monospace;

    /* Transitions */
    --theme-transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease, box-shadow 0.3s ease;
}

/* --------------------------------------------------------------------------
   NIGHT MODE (DEFAULT)
   -------------------------------------------------------------------------- */
html[data-theme="dark"] {
    --bg-page: #0b0f19;
    --bg-subtle: #0f172a;
    --bg-surface: #121827;
    --bg-card: #182235;
    --bg-card-hover: #1e293b;
    --border-color: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(99, 102, 241, 0.4);
    
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    
    --accent-color: #6366f1;
    --accent-hover: #4f46e5;
    --accent-subtle: rgba(99, 102, 241, 0.12);

    --tag-green: #10b981;
    --tag-green-bg: rgba(16, 185, 129, 0.12);
    --tag-blue: #3b82f6;
    --tag-purple: #a855f7;

    --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-hover: 0 12px 30px rgba(0, 0, 0, 0.6);
}

/* --------------------------------------------------------------------------
   DAY MODE
   -------------------------------------------------------------------------- */
html[data-theme="light"] {
    --bg-page: #f8fafc;
    --bg-subtle: #f1f5f9;
    --bg-surface: #ffffff;
    --bg-card: #ffffff;
    --bg-card-hover: #f8fafc;
    --border-color: #e2e8f0;
    --border-hover: #cbd5e1;
    
    --text-primary: #0f172a;
    --text-secondary: #334155;
    --text-muted: #64748b;
    
    --accent-color: #2563eb;
    --accent-hover: #1d4ed8;
    --accent-subtle: rgba(37, 99, 235, 0.08);

    --tag-green: #059669;
    --tag-green-bg: rgba(5, 150, 105, 0.1);
    --tag-blue: #2563eb;
    --tag-purple: #7c3aed;

    --shadow-card: 0 2px 8px rgba(15, 23, 42, 0.06);
    --shadow-hover: 0 8px 24px rgba(15, 23, 42, 0.12);
}

/* ==========================================================================
   BASE & RESET
   ========================================================================== */

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    background-color: var(--bg-page);
    color: var(--text-primary);
    transition: var(--theme-transition);
    width: 100%;
    overflow-x: hidden;
}

body {
    font-family: var(--font-body);
    line-height: 1.6;
    background-color: var(--bg-page);
    color: var(--text-primary);
    overflow-x: hidden;
    width: 100%;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--text-primary);
    line-height: 1.25;
}

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

button, input, select, textarea {
    font-family: inherit;
}

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

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: var(--theme-transition);
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.1rem;
    letter-spacing: -0.3px;
}

.brand-prefix {
    color: var(--accent-color);
    font-family: var(--font-code);
}

.brand-name {
    color: var(--text-primary);
}

.brand-badge {
    font-family: var(--font-code);
    font-size: 0.68rem;
    padding: 2px 6px;
    border-radius: 4px;
    background: var(--accent-subtle);
    color: var(--accent-color);
    border: 1px solid var(--border-color);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 28px;
}

.nav-item {
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text-muted);
    transition: color 0.2s ease;
}

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

.item-num {
    font-family: var(--font-code);
    color: var(--accent-color);
    font-size: 0.78rem;
    margin-right: 4px;
}

.nav-github {
    display: flex;
    align-items: center;
    gap: 6px;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* Day/Night Theme Toggle Switch */
.theme-toggle-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-subtle);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 6px 14px;
    cursor: pointer;
    color: var(--text-primary);
    transition: all 0.2s ease;
}

.theme-toggle-btn:hover {
    border-color: var(--accent-color);
}

.theme-icon {
    display: flex;
    align-items: center;
}

html[data-theme="dark"] .sun-icon { display: none; }
html[data-theme="dark"] .moon-icon { display: flex; color: var(--accent-color); }
html[data-theme="light"] .sun-icon { display: flex; color: #f59e0b; }
html[data-theme="light"] .moon-icon { display: none; }

.theme-label {
    font-family: var(--font-code);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 1px;
}

/* Mobile Toggle */
.mobile-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-around;
    width: 28px;
    height: 22px;
    background: transparent;
    border: none;
    cursor: pointer;
}

.toggle-bar {
    width: 100%;
    height: 2px;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: all 0.3s ease;
}

/* ==========================================================================
   BUTTONS & UTILITIES
   ========================================================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px 28px;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    cursor: pointer;
    transition: all 0.25s ease;
    border: 1px solid transparent;
}

.btn-primary {
    background-color: var(--accent-color);
    color: #ffffff;
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
}

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

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

.btn-outline {
    background-color: transparent;
    border-color: var(--border-color);
    color: var(--text-primary);
}

.btn-outline:hover {
    border-color: var(--text-primary);
    background-color: var(--accent-subtle);
}

.btn-full {
    width: 100%;
}

/* Text Accents */
.accent-text {
    color: var(--accent-color);
}

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

.text-green { color: var(--tag-green); }
.text-blue { color: var(--tag-blue); }
.text-purple { color: var(--tag-purple); }

/* ==========================================================================
   HERO SECTION
   ========================================================================== */

.hero {
    padding: 140px 24px 80px;
    max-width: 1280px;
    margin: 0 auto;
    min-height: 90vh;
    display: flex;
    align-items: center;
}

.hero-container {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 48px;
    align-items: center;
    width: 100%;
}

.status-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    padding: 6px 14px;
    border-radius: 30px;
    font-family: var(--font-code);
    font-size: 0.78rem;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.tag-pulse {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--tag-green);
    box-shadow: 0 0 8px var(--tag-green);
}

.hero-headline {
    font-size: clamp(2.2rem, 5vw, 3.4rem);
    font-weight: 700;
    letter-spacing: -1px;
    margin-bottom: 24px;
    line-height: 1.15;
}

.hero-subhead {
    font-size: clamp(1rem, 2.5vw, 1.15rem);
    color: var(--text-muted);
    margin-bottom: 36px;
    max-width: 620px;
}

.hero-cta {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 48px;
}

.hero-specs {
    display: flex;
    align-items: center;
    gap: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
}

.spec-box {
    display: flex;
    flex-direction: column;
}

.spec-val {
    font-family: var(--font-code);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.spec-lbl {
    font-size: 0.78rem;
    color: var(--text-muted);
    text-transform: uppercase;
}

.spec-sep {
    width: 1px;
    height: 32px;
    background-color: var(--border-color);
}

/* Hero Console Card */
.console-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: var(--shadow-card);
    overflow: hidden;
    transition: var(--theme-transition);
}

.console-header {
    background: var(--bg-subtle);
    padding: 12px 18px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
}

.console-dots {
    display: flex;
    gap: 6px;
}

.dot { width: 10px; height: 10px; border-radius: 50%; }
.dot.red { background: #ef4444; }
.dot.yellow { background: #f59e0b; }
.dot.green { background: #10b981; }

.console-title {
    font-family: var(--font-code);
    font-size: 0.78rem;
    color: var(--text-muted);
    font-weight: 600;
}

.console-tabs {
    display: flex;
    gap: 4px;
}

.tab-btn {
    background: transparent;
    border: none;
    font-family: var(--font-code);
    font-size: 0.72rem;
    color: var(--text-muted);
    padding: 4px 10px;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.tab-btn.active, .tab-btn:hover {
    background: var(--accent-subtle);
    color: var(--accent-color);
    font-weight: 600;
}

.console-body {
    padding: 24px;
    font-family: var(--font-code);
    font-size: 0.85rem;
    min-height: 280px;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.code-line {
    margin-bottom: 6px;
    color: var(--text-secondary);
}

.c-keyword { color: #f43f5e; font-weight: 600; }
.c-val { color: #38bdf8; }
.c-func { color: #818cf8; }
.c-str { color: #34d399; }
.c-comment { color: var(--text-muted); font-style: italic; }
.c-decorator { color: #fbbf24; }

.console-status-box {
    margin-top: 20px;
    background: var(--bg-subtle);
    border: 1px solid var(--border-color);
    padding: 12px 16px;
    border-radius: 6px;
    font-size: 0.78rem;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.status-row {
    display: flex;
    justify-content: space-between;
}

/* Console Inference Tab */
.infer-control label {
    display: block;
    font-size: 0.8rem;
    margin-bottom: 8px;
    color: var(--text-muted);
}

.infer-input-wrap {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
}

.infer-input-wrap input {
    flex-grow: 1;
    background: var(--bg-subtle);
    border: 1px solid var(--border-color);
    padding: 8px 12px;
    border-radius: 6px;
    color: var(--text-primary);
    font-family: var(--font-code);
    font-size: 0.8rem;
}

.btn-console-exec {
    background: var(--accent-color);
    color: #fff;
    border: none;
    padding: 8px 16px;
    border-radius: 6px;
    font-family: var(--font-code);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
}

.console-output {
    background: var(--bg-subtle);
    border: 1px solid var(--border-color);
    padding: 14px;
    border-radius: 6px;
}

.output-label {
    font-size: 0.72rem;
    color: var(--accent-color);
    display: block;
    margin-bottom: 6px;
}

.console-output pre {
    color: var(--tag-green);
    font-size: 0.8rem;
    white-space: pre-wrap;
    word-break: break-word;
}

/* Console Stack Tab */
.stack-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.stack-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 14px;
    background: var(--bg-subtle);
    border: 1px solid var(--border-color);
    border-radius: 6px;
}

.st-name {
    font-size: 0.82rem;
    color: var(--text-primary);
}

.st-badge {
    font-size: 0.72rem;
    background: var(--accent-subtle);
    color: var(--accent-color);
    padding: 2px 8px;
    border-radius: 4px;
}

/* ==========================================================================
   SECTIONS COMMON
   ========================================================================== */

.section {
    padding: 100px 24px;
    transition: var(--theme-transition);
}

.bg-subtle {
    background-color: var(--bg-subtle);
}

.section-container {
    max-width: 1280px;
    margin: 0 auto;
}

.section-header {
    margin-bottom: 56px;
}

.section-tag {
    font-family: var(--font-code);
    color: var(--accent-color);
    font-size: 0.82rem;
    letter-spacing: 1.5px;
    margin-bottom: 8px;
    font-weight: 600;
}

.section-title {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: -0.5px;
}

.section-sub {
    font-size: 1.05rem;
    color: var(--text-muted);
    max-width: 680px;
}

/* ==========================================================================
   "WHAT WE ARE BUILDING" (WORK SECTION)
   ========================================================================== */

.work-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
}

.work-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 28px;
    display: flex;
    flex-direction: column;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-card);
}

.work-card:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-hover);
    transform: translateY(-4px);
}

.highlight-border {
    border-color: var(--accent-color);
    background: linear-gradient(180deg, var(--bg-surface), var(--accent-subtle));
}

.card-header-tag {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    font-family: var(--font-code);
    font-size: 0.72rem;
}

.badge-cat {
    color: var(--accent-color);
    background: var(--accent-subtle);
    padding: 4px 10px;
    border-radius: 4px;
    font-weight: 600;
}

.badge-status {
    color: var(--text-muted);
}

.badge-status.live {
    color: var(--tag-green);
}

.badge-status.dev {
    color: var(--tag-purple);
}

.card-title {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.card-purpose {
    font-size: 0.92rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.5;
    flex-grow: 1;
}

.card-outcomes {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 20px;
}

.outcome-tag {
    font-size: 0.75rem;
    background: var(--bg-subtle);
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    padding: 3px 8px;
    border-radius: 4px;
}

.card-tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 24px;
    padding-top: 16px;
    border-top: 1px dashed var(--border-color);
}

.card-tech-stack span {
    font-family: var(--font-code);
    font-size: 0.72rem;
    color: var(--accent-color);
}

.card-footer {
    margin-top: auto;
}

.card-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-code);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--accent-color);
    transition: gap 0.2s ease;
}

.card-link:hover {
    gap: 12px;
    color: var(--accent-hover);
}

/* ==========================================================================
   CAPABILITIES SECTION
   ========================================================================== */

.cap-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 28px;
}

.cap-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 32px;
    transition: all 0.3s ease;
}

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

.cap-icon {
    font-size: 2.2rem;
    margin-bottom: 16px;
}

.cap-name {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.cap-desc {
    color: var(--text-muted);
    font-size: 0.92rem;
    line-height: 1.6;
}

/* ==========================================================================
   TECH STACK SECTION
   ========================================================================== */

.tech-box-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
}

.tech-pill-box {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 16px;
    transition: all 0.2s ease;
}

.tech-pill-box:hover {
    border-color: var(--accent-color);
    background: var(--bg-card-hover);
}

.tp-icon {
    font-size: 2rem;
}

.tp-info {
    display: flex;
    flex-direction: column;
}

.tp-title {
    font-weight: 700;
    font-size: 1rem;
}

.tp-sub {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-family: var(--font-code);
}

/* ==========================================================================
   CONTACT SECTION
   ========================================================================== */

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: start;
}

.contact-title {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 16px;
}

.contact-sub {
    font-size: 1rem;
    color: var(--text-muted);
    margin-bottom: 36px;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 16px;
    font-family: var(--font-code);
    font-size: 0.85rem;
}

.c-detail-item {
    display: flex;
    gap: 12px;
}

.c-lbl {
    color: var(--accent-color);
    font-weight: 600;
    width: 110px;
}

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

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

.contact-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 32px;
    box-shadow: var(--shadow-card);
}

.c-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-field {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-field label {
    font-family: var(--font-code);
    font-size: 0.78rem;
    color: var(--text-muted);
    font-weight: 600;
}

.form-field input,
.form-field select,
.form-field textarea {
    background: var(--bg-subtle);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 12px 16px;
    color: var(--text-primary);
    font-size: 0.9rem;
    transition: border-color 0.2s ease;
}

.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
    outline: none;
    border-color: var(--accent-color);
}

.contact-response {
    margin-top: 16px;
    font-family: var(--font-code);
    font-size: 0.85rem;
}

.contact-response.success {
    color: var(--tag-green);
}

/* ==========================================================================
   FOOTER
   ========================================================================== */

.footer {
    border-top: 1px solid var(--border-color);
    background: var(--bg-surface);
    padding: 40px 24px;
    transition: var(--theme-transition);
}

.footer-container {
    max-width: 1280px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-copy {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.footer-right {
    display: flex;
    gap: 20px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.footer-link:hover {
    color: var(--accent-color);
}

/* ==========================================================================
   RESPONSIVE MEDIA QUERIES
   ========================================================================== */

@media (max-width: 992px) {
    .hero-container, .contact-wrapper {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .navbar {
        padding: 6px 0;
    }

    .mobile-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 60px;
        left: 0;
        width: 100%;
        height: calc(100vh - 60px);
        background: var(--bg-surface);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 32px;
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: all 0.3s ease;
        border-bottom: 1px solid var(--border-color);
    }

    .nav-menu.mobile-active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }

    .nav-item {
        font-size: 1.1rem;
    }

    .hero {
        padding-top: 110px;
    }

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

    .btn {
        width: 100%;
    }

    .hero-specs {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }

    .spec-sep {
        display: none;
    }
}

@media (max-width: 480px) {
    .section {
        padding: 60px 16px;
    }

    .work-card, .cap-card, .contact-card {
        padding: 20px;
    }

    .console-body {
        padding: 16px;
    }
}

/* Accessibility: Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}