/* ==========================================================================
   CSS Custom Properties - Dark Cyber Minimalist
   ========================================================================== */

:root {
    /* SURFACES - Dark mode foundation */
    --surface-base: #0A0A0B;
    --surface-raised: #111113;
    --surface-overlay: #18181B;
    --surface-interactive: #1F1F23;

    /* BORDERS - Subtle white overlays */
    --border-subtle: rgba(255, 255, 255, 0.06);
    --border-default: rgba(255, 255, 255, 0.10);
    --border-strong: rgba(255, 255, 255, 0.15);

    /* TEXT - High contrast hierarchy */
    --text-primary: #FAFAFA;
    --text-secondary: #A1A1AA;
    --text-tertiary: #71717A;

    /* ACCENT - Indigo (Linear.app style) */
    --accent-primary: #6366F1;
    --accent-primary-hover: #818CF8;
    --accent-primary-muted: rgba(99, 102, 241, 0.15);

    /* Status colors */
    --status-success: #10B981;
    --status-success-muted: rgba(16, 185, 129, 0.15);
    --status-warning: #F59E0B;
    --status-warning-muted: rgba(245, 158, 11, 0.15);

    /* Legacy mappings for compatibility */
    --color-bg: var(--surface-base);
    --color-bg-alt: var(--surface-raised);
    --color-bg-elevated: var(--surface-overlay);
    --color-text: var(--text-primary);
    --color-text-secondary: var(--text-secondary);
    --color-text-muted: var(--text-secondary);
    --color-text-subtle: var(--text-tertiary);
    --color-primary: var(--text-primary);
    --color-primary-hover: var(--text-secondary);
    --color-accent: var(--accent-primary);
    --color-border: var(--border-default);
    --color-border-light: var(--border-subtle);
    --color-border-subtle: var(--border-subtle);

    /* Typography */
    --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, 'SF Mono', Consolas, 'Liberation Mono', Menlo, monospace;

    /* Font Sizes - Refined scale with more contrast */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.5rem;
    --text-5xl: 3.75rem;
    --text-6xl: 5rem;

    /* Spacing - More generous scale */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;
    --space-5xl: 10rem;

    /* Layout */
    --max-width: 1140px;
    --content-width: 60ch;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;

    /* Shadows - Dark mode optimized */
    --shadow-xs: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.4), 0 1px 2px -1px 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 / 0.4), 0 4px 6px -4px rgb(0 0 0 / 0.3);
    --shadow-card: 0 1px 3px 0 rgb(0 0 0 / 0.3), 0 1px 2px -1px rgb(0 0 0 / 0.2);
    --shadow-card-hover: 0 8px 25px -5px rgb(0 0 0 / 0.5), 0 4px 10px -4px rgb(0 0 0 / 0.3);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.15);

    /* Border radius - Softer, more modern */
    --radius-sm: 0.375rem;
    --radius-md: 0.625rem;
    --radius-lg: 1rem;
    --radius-xl: 1.25rem;
    --radius-full: 9999px;
}

/* ==========================================================================
   CSS Reset (Modern Minimal)
   ========================================================================== */

*,
*::before,
*::after {
    box-sizing: border-box;
}

* {
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    min-height: 100vh;
    line-height: 1.6;
    font-family: var(--font-sans);
    font-size: var(--text-base);
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img,
picture,
video,
canvas,
svg {
    display: block;
    max-width: 100%;
}

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

p,
h1,
h2,
h3,
h4,
h5,
h6 {
    overflow-wrap: break-word;
}

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

ul,
ol {
    list-style: none;
}

/* ==========================================================================
   Base Typography
   ========================================================================== */

h1,
h2,
h3,
h4 {
    line-height: 1.2;
    font-weight: 600;
    letter-spacing: -0.02em;
}

h1 {
    font-size: var(--text-4xl);
}

h2 {
    font-size: var(--text-2xl);
}

h3 {
    font-size: var(--text-xl);
}

p {
    max-width: var(--content-width);
}

p + p {
    margin-top: var(--space-md);
}

/* ==========================================================================
   Layout
   ========================================================================== */

.container {
    width: 100%;
    max-width: var(--max-width);
    margin-inline: auto;
    padding-inline: var(--space-lg);
}

.section {
    padding-block: var(--space-5xl);
    scroll-margin-top: 5rem;
}

.section:nth-child(even) {
    background-color: var(--surface-raised);
}

.section__title {
    margin-bottom: var(--space-2xl);
    font-size: var(--text-2xl);
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

/* ==========================================================================
   Navigation
   ========================================================================== */

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: rgba(10, 10, 11, 0.9);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-subtle);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: var(--max-width);
    margin-inline: auto;
    padding: var(--space-md) var(--space-lg);
}

.nav__logo {
    font-weight: 700;
    font-size: var(--text-lg);
    letter-spacing: -0.02em;
    color: var(--text-primary);
    transition: color var(--transition-fast);
}

.nav__logo:hover {
    color: var(--accent-primary);
}

.nav__toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-sm);
    background: none;
    border: none;
    cursor: pointer;
    z-index: 101;
}

.nav__toggle-bar {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    transition: var(--transition-base);
    border-radius: 2px;
}

.nav__list {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
}

.nav__link {
    font-size: var(--text-sm);
    color: var(--text-tertiary);
    transition: color var(--transition-fast);
    position: relative;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-primary);
    transition: width var(--transition-fast);
    border-radius: 1px;
}

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

.nav__link:hover::after {
    width: 100%;
}

/* Nav CTA button */
.nav__cta-wrapper {
    margin-left: var(--space-sm);
}

.btn--nav {
    padding: 0.5rem 1rem;
    font-size: var(--text-sm);
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
}

.btn--nav:hover {
    background-color: var(--accent-primary-muted);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

/* Mobile navigation */
@media (max-width: 768px) {
    .nav__toggle {
        display: flex;
    }

    .nav__list {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: var(--space-xl);
        padding: var(--space-2xl);
        background-color: var(--surface-base);
        opacity: 0;
        visibility: hidden;
        transition: opacity var(--transition-slow), visibility var(--transition-slow);
    }

    .nav__list.is-open {
        opacity: 1;
        visibility: visible;
    }

    .nav__link {
        font-size: var(--text-2xl);
        font-weight: 500;
        opacity: 0;
        transform: translateY(20px);
        transition: opacity var(--transition-base), transform var(--transition-base), color var(--transition-fast);
    }

    .nav__list.is-open .nav__link {
        opacity: 1;
        transform: translateY(0);
    }

    /* Staggered animation */
    .nav__list.is-open li:nth-child(1) .nav__link { transition-delay: 50ms; }
    .nav__list.is-open li:nth-child(2) .nav__link { transition-delay: 100ms; }
    .nav__list.is-open li:nth-child(3) .nav__link { transition-delay: 150ms; }
    .nav__list.is-open li:nth-child(4) .nav__link { transition-delay: 200ms; }
    .nav__list.is-open li:nth-child(5) .nav__link { transition-delay: 250ms; }
    .nav__list.is-open li:nth-child(6) { transition-delay: 300ms; }

    .nav__cta-wrapper {
        margin-left: 0;
        margin-top: var(--space-lg);
        opacity: 0;
        transform: translateY(20px);
        transition: opacity var(--transition-base), transform var(--transition-base);
    }

    .nav__list.is-open .nav__cta-wrapper {
        opacity: 1;
        transform: translateY(0);
        transition-delay: 300ms;
    }

    .nav__list.is-open .btn--nav {
        padding: 0.75rem 1.5rem;
        font-size: var(--text-base);
    }

    /* Toggle X animation */
    .nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(2) {
        opacity: 0;
    }

    .nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero {
    position: relative;
    display: flex;
    align-items: center;
    min-height: calc(100vh - 4rem);
    padding-block: var(--space-5xl);
    background-color: var(--surface-base);
    overflow: hidden;
}

/* Grid background effect */
.hero__bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.hero__grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse 80% 50% at 50% 0%, black 70%, transparent 100%);
    -webkit-mask-image: radial-gradient(ellipse 80% 50% at 50% 0%, black 70%, transparent 100%);
}

.hero__container {
    position: relative;
    z-index: 1;
}

.hero__content {
    max-width: 700px;
}

/* Eyebrow badge */
.hero__badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 0.375rem 0.875rem;
    background-color: var(--status-success-muted);
    border: 1px solid rgba(16, 185, 129, 0.2);
    border-radius: var(--radius-full);
    margin-bottom: var(--space-xl);
}

.hero__badge-dot {
    width: 8px;
    height: 8px;
    background-color: var(--status-success);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(1.1); }
}

.hero__badge-text {
    font-size: var(--text-xs);
    font-weight: 600;
    color: var(--status-success);
    letter-spacing: 0.02em;
}

.hero__title {
    font-size: clamp(var(--text-5xl), 12vw, var(--text-6xl));
    font-weight: 700;
    letter-spacing: -0.035em;
    line-height: 1.05;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.hero__title-accent {
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-primary-hover) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero__subtitle {
    font-size: var(--text-sm);
    color: var(--text-tertiary);
    font-weight: 500;
    font-family: var(--font-mono);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: var(--space-lg);
}

.hero__tagline {
    font-size: var(--text-xl);
    line-height: 1.6;
    color: var(--text-secondary);
    max-width: 42ch;
    font-weight: 400;
    margin-bottom: var(--space-xl);
}

.hero__meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-lg);
    margin-bottom: var(--space-2xl);
}

.hero__meta-item {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: var(--text-sm);
    color: var(--text-tertiary);
}

.hero__meta-icon {
    color: var(--text-tertiary);
    opacity: 0.7;
}

.hero__cta {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 1.75rem;
    font-size: var(--text-sm);
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    cursor: pointer;
    border: none;
    text-decoration: none;
    letter-spacing: 0.01em;
}

.btn--primary {
    background-color: var(--accent-primary);
    color: white;
    box-shadow: var(--shadow-sm), 0 0 20px rgba(99, 102, 241, 0.2);
}

.btn--primary:hover {
    background-color: var(--accent-primary-hover);
    box-shadow: var(--shadow-md), 0 0 30px rgba(99, 102, 241, 0.3);
    transform: translateY(-1px);
}

.btn--secondary {
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-default);
}

.btn--secondary:hover {
    border-color: var(--border-strong);
    background-color: var(--surface-interactive);
}

/* ==========================================================================
   About Section
   ========================================================================== */

.about__content {
    max-width: var(--content-width);
}

.about__content p {
    color: var(--text-secondary);
    font-size: var(--text-base);
    line-height: 1.75;
}

.about__content p + p {
    margin-top: var(--space-lg);
}

/* About - AI Callout */
.about__callout {
    margin-top: var(--space-2xl);
    padding: var(--space-lg) var(--space-xl);
    max-width: var(--content-width);
    background-color: var(--surface-overlay);
    border-left: 3px solid var(--accent-primary);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.about__callout-title {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--accent-primary);
    margin-bottom: var(--space-sm);
    letter-spacing: 0.01em;
}

.about__callout p {
    color: var(--text-secondary);
    font-size: var(--text-sm);
    line-height: 1.75;
}

/* ==========================================================================
   Career Focus Section
   ========================================================================== */

.career-focus__content {
    max-width: var(--content-width);
}

.career-focus__content p {
    color: var(--text-secondary);
    font-size: var(--text-lg);
    line-height: 1.75;
}

/* ==========================================================================
   Achievements Section
   ========================================================================== */

.achievements__grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
}

.achievement {
    display: flex;
    flex-direction: column;
    background-color: var(--surface-raised);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.achievement:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: var(--shadow-card-hover);
    border-color: var(--border-default);
}

/* Featured achievement spans full width */
.achievement--featured {
    grid-column: 1 / -1;
}

.achievement--featured .achievement__image-wrapper {
    aspect-ratio: 21 / 9;
}

/* Image container */
.achievement__image-wrapper {
    aspect-ratio: 16 / 9;
    overflow: hidden;
    position: relative;
}

.achievement__image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.achievement:hover .achievement__image {
    transform: scale(1.05);
}

/* Gradient placeholders for missing images */
.achievement__placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--surface-overlay), var(--surface-raised));
    position: relative;
}

.achievement__placeholder::after {
    content: '';
    position: absolute;
    inset: 0;
    opacity: 0.5;
}

.achievement__placeholder--btb {
    background: linear-gradient(135deg, #1e1b4b 0%, #312e81 50%, #3730a3 100%);
}

.achievement__placeholder--speaking {
    background: linear-gradient(135deg, #134e4a 0%, #115e59 50%, #0d9488 100%);
}

.achievement__placeholder--title3 {
    background: linear-gradient(135deg, #7c2d12 0%, #9a3412 50%, #c2410c 100%);
}

.achievement__placeholder--academic {
    background: linear-gradient(135deg, #581c87 0%, #6b21a8 50%, #7c3aed 100%);
}

.achievement__content {
    padding: var(--space-lg) var(--space-xl);
    flex: 1;
}

.achievement__label {
    display: inline-block;
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-tertiary);
    margin-bottom: var(--space-sm);
}

.achievement__title {
    font-size: var(--text-base);
    font-weight: 600;
    line-height: 1.35;
    margin-bottom: var(--space-xs);
    color: var(--text-primary);
}

.achievement__subtitle {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ==========================================================================
   Community & Mentorship Section
   ========================================================================== */

.community__grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
}

.community__item {
    padding: var(--space-lg) var(--space-xl);
    background-color: var(--surface-raised);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.community__item:hover {
    border-color: var(--border-default);
    box-shadow: var(--shadow-card);
}

.community__item-title {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.community__item-desc {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    line-height: 1.7;
}

@media (max-width: 768px) {
    .community__grid {
        grid-template-columns: 1fr;
    }
}

/* ==========================================================================
   Projects Section
   ========================================================================== */

.section__subtitle {
    color: var(--text-secondary);
    font-size: var(--text-base);
    max-width: var(--content-width);
    margin-top: calc(-1 * var(--space-md));
    margin-bottom: var(--space-3xl);
    line-height: 1.6;
}

.projects__list {
    display: flex;
    flex-direction: column;
    gap: var(--space-2xl);
}

/* Individual Project */
.project {
    padding: var(--space-2xl);
    background-color: var(--surface-raised);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.project:hover {
    border-color: var(--border-default);
    box-shadow: var(--shadow-card-hover);
}

/* Featured project styling */
.project--featured {
    border-color: var(--border-default);
    position: relative;
    overflow: hidden;
}

.project--featured::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-primary-hover));
}

.project__header {
    margin-bottom: var(--space-xl);
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--border-subtle);
}

.project__title-row {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    flex-wrap: wrap;
    margin-bottom: var(--space-lg);
}

.project__title {
    font-size: var(--text-2xl);
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.project__title-row .project__title {
    margin-bottom: 0;
}

.project__stack {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.tag {
    display: inline-block;
    padding: 0.375rem 0.75rem;
    font-size: var(--text-xs);
    font-weight: 500;
    background-color: var(--surface-overlay);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    border: 1px solid var(--border-subtle);
    transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.tag:hover {
    border-color: var(--border-default);
    background-color: var(--surface-interactive);
}

.tag--status {
    background-color: var(--status-warning-muted);
    color: var(--status-warning);
    border-color: rgba(245, 158, 11, 0.2);
}

.tag--status-complete {
    background-color: var(--status-success-muted);
    color: var(--status-success);
    border-color: rgba(16, 185, 129, 0.2);
}

.project__content {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
}

.project__section {
    padding: var(--space-lg) var(--space-xl);
    background-color: var(--surface-overlay);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-subtle);
}

.project__section-title {
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-tertiary);
    margin-bottom: var(--space-md);
}

.project__section p {
    color: var(--text-secondary);
    font-size: var(--text-sm);
    line-height: 1.7;
}

.project__list {
    font-size: var(--text-sm);
    line-height: 1.75;
    color: var(--text-secondary);
}

.project__list li {
    position: relative;
    padding-left: var(--space-lg);
    margin-bottom: var(--space-sm);
}

.project__list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.65em;
    width: 5px;
    height: 5px;
    background-color: var(--accent-primary);
    border-radius: 50%;
}

.project__footer {
    display: flex;
    gap: var(--space-lg);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--border-subtle);
}

.project__link {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--text-primary);
    transition: color var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
}

.project__link::after {
    content: '\2192';
    transition: transform var(--transition-fast);
}

.project__link:hover {
    color: var(--accent-primary);
}

.project__link:hover::after {
    transform: translateX(3px);
}

/* Responsive: Stack on mobile */
@media (max-width: 768px) {
    .project__content {
        grid-template-columns: 1fr;
    }

    .project {
        padding: var(--space-lg);
    }
}

/* ==========================================================================
   Skills Section
   ========================================================================== */

.skills__section-title {
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-tertiary);
    margin-bottom: var(--space-lg);
}

/* Certifications - displayed first for credibility */
.certifications {
    margin-bottom: var(--space-3xl);
}

.certifications__list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-md);
}

.certification {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-lg) var(--space-xl);
    background-color: var(--surface-raised);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.certification:hover {
    border-color: var(--border-default);
    box-shadow: var(--shadow-card);
}

.certification__icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background-color: var(--status-success-muted);
    border-radius: var(--radius-md);
    color: var(--status-success);
    flex-shrink: 0;
}

.certification__icon--pending {
    background-color: var(--status-warning-muted);
    color: var(--status-warning);
}

.certification__info {
    flex: 1;
    min-width: 0;
}

.certification__name {
    display: block;
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.certification__detail {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    font-family: var(--font-mono);
}

.certification__status {
    font-size: var(--text-xs);
    font-weight: 600;
    padding: 0.375rem 0.75rem;
    background-color: var(--status-success-muted);
    color: var(--status-success);
    border-radius: var(--radius-full);
    letter-spacing: 0.01em;
    white-space: nowrap;
}

.certification__status--pending {
    background-color: var(--status-warning-muted);
    color: var(--status-warning);
}

.certification__icon--planned {
    background-color: var(--accent-primary-muted);
    color: var(--accent-primary);
}

.certification__status--planned {
    background-color: var(--accent-primary-muted);
    color: var(--accent-primary);
}

/* Skills Grid */
.skills__grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-2xl);
}

.skill-group__title {
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-tertiary);
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid var(--border-subtle);
}

.skill-group__list li {
    padding: var(--space-sm) 0;
    color: var(--text-secondary);
    font-size: var(--text-sm);
    line-height: 1.4;
    transition: color var(--transition-fast);
}

.skill-group__list li:hover {
    color: var(--text-primary);
}

/* What I'm Learning Now */
.learning {
    margin-top: var(--space-3xl);
}

.learning__items {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.learning__tag {
    display: inline-block;
    padding: 0.5rem 1rem;
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--accent-primary);
    background-color: var(--accent-primary-muted);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: var(--radius-full);
    transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.learning__tag:hover {
    background-color: rgba(99, 102, 241, 0.25);
    border-color: var(--accent-primary);
}

/* ==========================================================================
   Experience Section
   ========================================================================== */

.experience__timeline {
    max-width: var(--content-width);
    position: relative;
}

/* Gradient timeline line */
.experience__timeline::before {
    content: '';
    position: absolute;
    left: 5px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--accent-primary) 0%, var(--border-subtle) 100%);
    border-radius: 1px;
}

.experience-item {
    position: relative;
    padding-left: var(--space-2xl);
    padding-bottom: var(--space-2xl);
}

.experience-item:last-child {
    padding-bottom: 0;
}

/* Dot indicator */
.experience-item__dot {
    position: absolute;
    left: 0;
    top: 4px;
    width: 12px;
    height: 12px;
    background-color: var(--surface-base);
    border: 2px solid var(--accent-primary);
    border-radius: 50%;
    z-index: 1;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.experience-item:hover .experience-item__dot {
    background-color: var(--accent-primary);
    transform: scale(1.2);
}

/* Content wrapper for hover effect */
.experience-item__content {
    padding: var(--space-lg);
    background-color: transparent;
    border-radius: var(--radius-lg);
    transition: background-color var(--transition-base);
}

.experience-item:hover .experience-item__content {
    background-color: var(--surface-raised);
}

.experience-item__title {
    margin-bottom: var(--space-sm);
    font-size: var(--text-lg);
    font-weight: 600;
    letter-spacing: -0.01em;
    color: var(--text-primary);
}

.experience-item__org {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--accent-primary);
    margin-bottom: var(--space-xs);
}

.experience-item__period {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    margin-bottom: var(--space-md);
    font-weight: 500;
    letter-spacing: 0.02em;
    font-family: var(--font-mono);
}

.experience-item__description {
    color: var(--text-secondary);
    font-size: var(--text-sm);
    line-height: 1.7;
}

/* ==========================================================================
   Blog Section
   ========================================================================== */

.blog__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

.blog-card {
    display: flex;
    flex-direction: column;
    padding: var(--space-xl);
    background-color: var(--surface-raised);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    transition: border-color var(--transition-base), box-shadow var(--transition-base), transform var(--transition-base);
}

.blog-card:hover {
    border-color: var(--border-default);
    box-shadow: var(--shadow-card-hover);
    transform: translateY(-2px);
}

.blog-card--ready {
    border-color: var(--border-default);
}

.blog-card--ready .blog-card__meta {
    color: var(--accent-primary);
}

.blog-card__label {
    display: inline-block;
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-tertiary);
    margin-bottom: var(--space-md);
}

.blog-card__title {
    font-size: var(--text-base);
    font-weight: 600;
    line-height: 1.4;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.blog-card__excerpt {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    line-height: 1.7;
    flex: 1;
}

.blog-card__meta {
    margin-top: var(--space-lg);
    font-size: var(--text-xs);
    font-weight: 500;
    color: var(--text-tertiary);
    font-family: var(--font-mono);
    letter-spacing: 0.02em;
}

@media (max-width: 768px) {
    .blog__grid {
        grid-template-columns: 1fr;
    }
}

@media (min-width: 769px) and (max-width: 1023px) {
    .blog__grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ==========================================================================
   Contact Section
   ========================================================================== */

.contact__intro {
    color: var(--text-secondary);
    font-size: var(--text-lg);
    margin-bottom: var(--space-2xl);
    line-height: 1.6;
    max-width: var(--content-width);
}

.contact__cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-md);
}

.contact__card {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-lg) var(--space-xl);
    background-color: var(--surface-raised);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    transition: border-color var(--transition-base), background-color var(--transition-base), transform var(--transition-base);
}

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

.contact__card-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background-color: var(--surface-overlay);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    flex-shrink: 0;
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

.contact__card:hover .contact__card-icon {
    color: var(--accent-primary);
    background-color: var(--accent-primary-muted);
}

.contact__card-content {
    flex: 1;
    min-width: 0;
}

.contact__card-label {
    display: block;
    font-size: var(--text-xs);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-tertiary);
    margin-bottom: 2px;
}

.contact__card-value {
    display: block;
    font-size: var(--text-base);
    font-weight: 500;
    color: var(--text-primary);
}

.contact__card-arrow {
    color: var(--text-tertiary);
    flex-shrink: 0;
    transition: color var(--transition-fast), transform var(--transition-fast);
}

.contact__card:hover .contact__card-arrow {
    color: var(--accent-primary);
    transform: translate(3px, -3px);
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
    padding: var(--space-2xl) 0;
    border-top: 1px solid var(--border-subtle);
    background-color: var(--surface-base);
}

.site-footer p {
    font-size: var(--text-sm);
    color: var(--text-tertiary);
    text-align: center;
    letter-spacing: 0.01em;
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */

/* Tablet (640px and up) */
@media (min-width: 640px) {
    .achievements__grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .skills__grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Desktop (1024px and up) */
@media (min-width: 1024px) {
    .skills__grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .project__content {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ==========================================================================
   Mobile Responsive (max-width)
   ========================================================================== */

@media (max-width: 1023px) {
    .skills__grid {
        gap: var(--space-xl);
    }
}

@media (max-width: 768px) {
    .section {
        padding-block: var(--space-3xl);
    }

    .section__title {
        font-size: var(--text-xl);
        margin-bottom: var(--space-xl);
    }

    .section__subtitle {
        margin-bottom: var(--space-xl);
    }

    .hero {
        min-height: auto;
        padding-block: var(--space-3xl);
    }

    .hero__tagline {
        font-size: var(--text-lg);
    }

    .hero__meta {
        flex-direction: column;
        gap: var(--space-sm);
    }

    .project {
        padding: var(--space-xl);
    }

    .project__title {
        font-size: var(--text-xl);
    }

    .project__section {
        padding: var(--space-lg);
    }

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

    .projects__list {
        gap: var(--space-xl);
    }

    .achievements__grid {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }

    .achievement--featured {
        grid-column: auto;
    }

    .achievement--featured .achievement__image-wrapper {
        aspect-ratio: 16 / 9;
    }

    .experience-item {
        padding-left: var(--space-xl);
        padding-bottom: var(--space-xl);
    }

    .experience__timeline::before {
        left: 5px;
    }

    .contact__intro {
        font-size: var(--text-base);
    }

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

@media (max-width: 639px) {
    .skills__grid {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
}

@media (max-width: 480px) {
    .container {
        padding-inline: var(--space-md);
    }

    .section {
        padding-block: var(--space-2xl);
    }

    .hero__title {
        font-size: var(--text-4xl);
    }

    .hero__badge {
        padding: 0.25rem 0.625rem;
    }

    .hero__cta {
        flex-direction: column;
        gap: var(--space-sm);
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

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

    .certification {
        padding: var(--space-md) var(--space-lg);
    }

    .achievement__content {
        padding: var(--space-md) var(--space-lg);
    }

    .experience-item__content {
        padding: var(--space-md);
    }
}

/* ==========================================================================
   Animations
   ========================================================================== */

/* Scroll-triggered fade-in-up animation */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* No animation for reduced motion */
.animate-on-scroll.no-animation {
    transition: none;
}

/* Header scroll state */
.site-header.is-scrolled {
    background-color: rgba(10, 10, 11, 0.95);
    border-bottom-color: var(--border-default);
}

/* Prefers reduced motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .animate-on-scroll {
        opacity: 1;
        transform: none;
    }

    .hero__badge-dot {
        animation: none;
    }
}

/* ==========================================================================
   Utilities
   ========================================================================== */

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}