/* ============================================================================
   SHARED BASE STYLES - Linux Terminal Themed Portfolio
   ============================================================================ */

/* ============================================================================
   1. CSS VARIABLES - Terminal Color Palette & Design Tokens
   ============================================================================ */

:root {
    /* Terminal Colors */
    --term-green: #4ade80;
    --term-green-dim: #22c55e;
    --term-green-bright: #86efac;
    --term-amber: #fbbf24;
    --term-cyan: #22d3ee;
    --term-red: #f87171;
    --term-purple: #c084fc;
    --term-blue: #60a5fa;

    /* Background Colors */
    --bg-primary: #0a0e17;
    --bg-secondary: #0f1623;
    --bg-tertiary: #151d2e;
    --bg-card: #111827;
    --bg-card-hover: #1a2332;
    --bg-elevated: #1e293b;

    /* Text Colors */
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --text-accent: #4ade80;

    /* Border Colors */
    --border-default: #1e293b;
    --border-hover: #334155;
    --border-accent: rgba(74, 222, 128, 0.3);

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4), 0 2px 4px -2px rgb(0 0 0 / 0.3);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.5), 0 4px 6px -4px rgb(0 0 0 / 0.4);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.5), 0 8px 10px -6px rgb(0 0 0 / 0.4);
    --shadow-glow: 0 0 20px rgba(74, 222, 128, 0.15);
    --shadow-glow-strong: 0 0 30px rgba(74, 222, 128, 0.25);
}

/* ============================================================================
   2. RESET & BASE STYLES
   ============================================================================ */

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

html {
    /* scroll-behavior: smooth; removed to resolve Lenis conflict */
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    letter-spacing: 0.3px;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 0.5em;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.1rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: 1em;
    color: var(--text-secondary);
}

a {
    color: var(--term-green);
    text-decoration: none;
    transition: transform 0.3s ease, opacity 0.3s ease, background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease, color 0.3s ease;
}

a:hover {
    color: var(--term-green-bright);
    text-decoration: underline;
}

ul, ol {
    list-style-position: inside;
    margin-bottom: 1em;
}

code {
    font-family: var(--font-mono);
    background-color: var(--bg-secondary);
    padding: 0.2em 0.4em;
    border-radius: 4px;
    font-size: 0.9em;
    color: var(--term-green);
}

pre {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-default);
    border-radius: 8px;
    padding: 1rem;
    overflow-x: auto;
    margin-bottom: 1rem;
    font-family: var(--font-mono);
}

pre code {
    background-color: transparent;
    padding: 0;
    color: var(--text-primary);
}

/* ============================================================================
   3. CONTAINER
   ============================================================================ */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    width: 100%;
}

@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }
}

/* ============================================================================
   4. SCANLINE EFFECT - Terminal Aesthetic
   ============================================================================ */

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: repeating-linear-gradient(
        0deg,
        rgba(0, 0, 0, 0.03),
        rgba(0, 0, 0, 0.03) 1px,
        transparent 1px,
        transparent 2px
    );
    pointer-events: none;
    z-index: 9999;
}

/* ============================================================================
   5. NAVIGATION - Terminal Prompt & Styling
   ============================================================================ */

nav {
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-default);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-md);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
}

/* Logo with root@host prompt styling */
.navbar-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.95rem;
    color: var(--text-primary);
}

.navbar-logo::before {
    content: 'root@host';
    color: var(--term-green);
}

.navbar-logo::after {
    content: '';
    display: inline-block;
    width: 2px;
    height: 1.2em;
    background-color: var(--term-green);
    margin-left: 0.2rem;
    animation: cursor-block 1s step-end infinite;
}

/* Cursor block animation */
@keyframes cursor-block {
    0%, 49% {
        background-color: var(--term-green);
    }
    50%, 100% {
        background-color: transparent;
    }
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    font-size: 0.95rem;
    transition: transform 0.3s ease, opacity 0.3s ease, background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease, color 0.3s ease;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -0.25rem;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--term-green);
    transition: width 0.3s ease;
}

.nav-links a:hover {
    color: var(--term-green);
}

.nav-links a:hover::after {
    width: 100%;
}

.nav-links a.active {
    color: var(--term-green);
}

.nav-links a.active::after {
    width: 100%;
}

/* Mobile menu toggle button */
.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 0.35rem;
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--term-green);
    transition: transform 0.3s ease, opacity 0.3s ease, background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease, color 0.3s ease;
    display: block;
}

.mobile-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.mobile-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* ============================================================================
   6. MOBILE MENU
   ============================================================================ */

.mobile-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-default);
    padding: 1rem;
    flex-direction: column;
    gap: 1rem;
}

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

.mobile-menu a {
    padding: 0.75rem 1rem;
    border-radius: 8px;
    transition: transform 0.3s ease, opacity 0.3s ease, background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease, color 0.3s ease;
    color: var(--text-secondary);
}

.mobile-menu a:hover,
.mobile-menu a.active {
    background-color: var(--bg-tertiary);
    color: var(--term-green);
}

/* ============================================================================
   7. BUTTON STYLES - Multiple Variants
   ============================================================================ */

.btn {
    display: inline-block;
    padding: 10px 20px;
    border-radius: 8px;
    font-family: var(--font-sans);
    font-size: 0.875rem; /* 14px */
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    border: none;
    transition: transform 0.3s ease, opacity 0.3s ease, background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease, color 0.3s ease;
    text-decoration: none;
    white-space: nowrap;
}

/* Primary button - Green terminal style */
.btn-primary {
    background-color: var(--term-green);
    color: var(--bg-primary);
    border: 1px solid var(--term-green);
}

.btn-primary:hover {
    background-color: var(--term-green-bright);
    border-color: var(--term-green-bright);
    box-shadow: var(--shadow-glow);
    text-decoration: none;
    color: var(--bg-primary);
}

/* Outline button - Green border with transparent background */
.btn-outline {
    background-color: transparent;
    color: var(--term-green);
    border: 1px solid var(--term-green);
}

.btn-outline:hover {
    background-color: rgba(74, 222, 128, 0.1);
    border-color: var(--term-green-bright);
    color: var(--term-green-bright);
    box-shadow: var(--shadow-glow);
}

/* White button - Secondary style */
.btn-white {
    background-color: var(--text-primary);
    color: var(--bg-primary);
    border: 1px solid var(--text-primary);
}

.btn-white:hover {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    border-color: var(--text-primary);
    box-shadow: var(--shadow-md);
}

/* Ghost button - Minimal style */
.btn-ghost {
    background-color: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-default);
}

.btn-ghost:hover {
    background-color: var(--bg-card-hover);
    color: var(--text-primary);
    border-color: var(--border-hover);
}

/* Book/Link button - Minimal text style */
.btn-book {
    background-color: transparent;
    color: var(--term-green);
    border: none;
    padding: 0;
    text-decoration: underline;
    font-weight: 600;
}

.btn-book:hover {
    color: var(--term-green-bright);
    text-decoration: underline;
}

/* ============================================================================
   8. PAGE HERO - Shared Between Speaking & Projects
   ============================================================================ */

.hero {
    padding: 4rem 0;
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-default);
}

.hero-content {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    line-height: 1.1;
    color: var(--text-primary);
}

.hero-title .term-highlight {
    color: var(--term-green);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

@media (max-width: 768px) {
    .hero {
        padding: 2.5rem 0;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }
}

/* ============================================================================
   9. STATS BAR - Status/Metrics Display
   ============================================================================ */

.stats-bar {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-default);
    border-radius: 8px;
    padding: 1.5rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.stat {
    text-align: center;
}

.stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--term-green);
    font-family: var(--font-mono);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-family: var(--font-mono);
}

@media (max-width: 768px) {
    .stats-bar {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }

    .stat-value {
        font-size: 1.5rem;
    }
}

/* ============================================================================
   10. SECTION STYLES - Consistent Spacing & Layout
   ============================================================================ */

.section {
    padding: 4rem 0;
    background-color: var(--bg-primary);
}

.section-alt {
    background-color: var(--bg-secondary);
}

.section-header {
    margin-bottom: 3rem;
}

.section-label {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--term-green);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 0.5rem;
}

.section-label::before {
    content: '# ';
    margin-right: 0.25rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.section-desc {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.8;
    max-width: 600px;
}

@media (max-width: 768px) {
    .section {
        padding: 2.5rem 0;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .section-desc {
        font-size: 1rem;
    }
}

/* ============================================================================
   11. CTA SECTION - Call-to-Action
   ============================================================================ */

.cta-section {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-default);
    border-radius: 8px;
    padding: 3rem;
    text-align: center;
    margin: 4rem 0;
}

.cta-section-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.cta-section-text {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.6;
}

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

@media (max-width: 768px) {
    .cta-section {
        padding: 2rem;
    }

    .cta-section-title {
        font-size: 1.5rem;
    }

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

    .btn {
        width: 100%;
    }
}

/* ============================================================================
   12. SOCIAL LINKS - Terminal Styled Social Icons
   ============================================================================ */

.social-links {
    display: flex;
    gap: 1.5rem;
    list-style: none;
}

.social-link {
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-card);
    border: 1px solid var(--border-default);
    border-radius: 0.375rem;
    color: var(--text-secondary);
    transition: transform 0.3s ease, opacity 0.3s ease, background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease, color 0.3s ease;
}

.social-link:hover {
    background-color: var(--bg-card-hover);
    color: var(--term-green);
    border-color: var(--term-green);
    box-shadow: var(--shadow-glow);
    transform: translateY(-2px);
}

/* ============================================================================
   13. FOOTER - Monospace & chmod Styling
   ============================================================================ */

footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-default);
    padding: 3rem 0;
    margin-top: 4rem;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-family: var(--font-mono);
    font-size: 0.95rem;
}

.footer-section ul {
    list-style: none;
    padding: 0;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: var(--text-secondary);
    transition: transform 0.3s ease, opacity 0.3s ease, background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease, color 0.3s ease;
}

.footer-section a:hover {
    color: var(--term-green);
}

.footer-bottom {
    border-top: 1px solid var(--border-default);
    padding-top: 2rem;
    text-align: center;
}

.chmod-notice {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.chmod-notice::before {
    content: '$ chmod ';
    color: var(--term-green);
}

.chmod-notice::after {
    content: ' portfolio';
    color: var(--text-secondary);
}

@media (max-width: 768px) {
    footer {
        padding: 2rem 0;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
}

/* ============================================================================
   14. SCROLL ANIMATIONS - Fade-In on Scroll
   ============================================================================ */

.animate-on-scroll {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-up {
    animation: fadeUp 0.6s ease forwards;
}

/* Staggered animation delays */
.animate-on-scroll:nth-child(1) { transition-delay: 0s; }
.animate-on-scroll:nth-child(2) { transition-delay: 0.1s; }
.animate-on-scroll:nth-child(3) { transition-delay: 0.2s; }
.animate-on-scroll:nth-child(4) { transition-delay: 0.3s; }
.animate-on-scroll:nth-child(5) { transition-delay: 0.4s; }

/* ============================================================================
   15. SKIP-TO-CONTENT LINK - Accessibility
   ============================================================================ */

.skip-to-content {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--term-green);
    color: var(--bg-primary);
    padding: 0.75rem 1.5rem;
    text-decoration: none;
    z-index: 10000;
    border-radius: 0.375rem;
    font-weight: 600;
}

.skip-to-content:focus {
    top: 0;
}

/* ============================================================================
   16. FOCUS-VISIBLE STYLES - Keyboard Navigation
   ============================================================================ */

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--term-green);
    outline-offset: 2px;
}

/* ============================================================================
   17. RESPONSIVE BREAKPOINTS
   ============================================================================ */

/* Large devices (1024px and up) */
@media (max-width: 1024px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.35rem; }

    .container {
        padding: 0 1.25rem;
    }
}

/* Tablets (768px and up) */
@media (max-width: 768px) {
    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }

    .container {
        padding: 0 1rem;
    }

    .mobile-toggle {
        display: flex;
    }

    .nav-links {
        display: none;
    }

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

/* Small devices (480px and up) */
@media (max-width: 480px) {
    h1 { font-size: 1.5rem; }
    h2 { font-size: 1.25rem; }
    h3 { font-size: 1.1rem; }

    .container {
        padding: 0 0.75rem;
    }

    .navbar {
        padding: 0.75rem 1rem;
    }

    .cta-section {
        padding: 1.5rem;
    }

    .section {
        padding: 2rem 0;
    }

    .hero {
        padding: 1.5rem 0;
    }

    .hero-title {
        font-size: 1.5rem;
    }

    .hero-subtitle {
        font-size: 0.95rem;
    }
}

/* ============================================================================
   18. PREFERS-REDUCED-MOTION - Accessibility
   ============================================================================ */

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

    @keyframes cursor-block {
        0%, 100% { background-color: var(--term-green); }
    }
}

/* ============================================================================
   END OF STYLES.CSS
   ============================================================================ */