/* ============================================
   CSS Variables & Theme Configuration
   ============================================ */

:root {
    /* Dark Theme (Default) */
    --bg-primary: #0a0e1a;
    --bg-secondary: #111827;
    --bg-card: #141c2e;
    --bg-card-hover: #1a2540;

    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    --accent-primary: #3b82f6;
    --accent-secondary: #2563eb;
    --accent-glow: rgba(59, 130, 246, 0.5);
    --accent-subtle: rgba(59, 130, 246, 0.1);

    --border-color: rgba(59, 130, 246, 0.2);
    --border-hover: rgba(59, 130, 246, 0.5);

    --tag-bg: rgba(59, 130, 246, 0.15);
    --tag-border: rgba(59, 130, 246, 0.3);
    --tag-text: #60a5fa;

    --success-color: #22c55e;
    --success-bg: rgba(34, 197, 94, 0.15);

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 30px rgba(59, 130, 246, 0.3);

    --grid-color: rgba(59, 130, 246, 0.05);

    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Font Families */
    --font-display: 'Orbitron', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --font-body: 'Space Grotesk', sans-serif;
    --font-lao: 'Noto Sans Lao Looped', sans-serif;
}

[data-theme="light"] {
    --bg-primary: #f0f4ff;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --bg-card-hover: #f8faff;

    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;

    --accent-primary: #2563eb;
    --accent-secondary: #1d4ed8;
    --accent-glow: rgba(37, 99, 235, 0.4);
    --accent-subtle: rgba(37, 99, 235, 0.08);

    --border-color: rgba(37, 99, 235, 0.2);
    --border-hover: rgba(37, 99, 235, 0.5);

    --tag-bg: rgba(37, 99, 235, 0.1);
    --tag-border: rgba(37, 99, 235, 0.25);
    --tag-text: #2563eb;

    --success-color: #16a34a;
    --success-bg: rgba(22, 163, 74, 0.12);

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --shadow-glow: 0 0 30px rgba(37, 99, 235, 0.2);

    --grid-color: rgba(37, 99, 235, 0.04);
}

/* ============================================
   Reset & Base Styles
   ============================================ */

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

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

body {
    font-family: var(--font-body);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    transition: background-color var(--transition-base), color var(--transition-base);
}

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

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

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

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* ============================================
   Grid Background Overlay
   ============================================ */

.grid-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    background-image:
        linear-gradient(var(--grid-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
    background-size: 50px 50px;
    opacity: 1;
}

/* ============================================
   Ambient Glow Blobs
   ============================================ */

.ambient-glow {
    position: fixed;
    border-radius: 50%;
    filter: blur(100px);
    pointer-events: none;
    z-index: 0;
    opacity: 0.5;
    transition: opacity var(--transition-slow);
}

.glow-1 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
    top: -200px;
    right: -200px;
}

.glow-2 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
    bottom: -150px;
    left: -150px;
}

.glow-3 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    opacity: 0.3;
}

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

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 70px;
    background: rgba(10, 14, 26, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: background-color var(--transition-base), border-color var(--transition-base);
}

[data-theme="light"] .navbar {
    background: rgba(255, 255, 255, 0.9);
}

.nav-container {
    max-width: 1200px;
    height: 100%;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--accent-primary);
    letter-spacing: 0.1em;
    transition: text-shadow var(--transition-fast);
}

.nav-logo:hover {
    color: var(--accent-primary);
    text-shadow: 0 0 20px var(--accent-glow);
}

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

.nav-link {
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    padding: 0.5rem 0;
    position: relative;
    transition: color var(--transition-fast);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-primary);
    transition: width var(--transition-base);
}

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

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

/* Theme Toggle */
.theme-toggle {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    background: var(--accent-subtle);
    border: 1px solid var(--border-color);
    color: var(--accent-primary);
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    background: var(--tag-bg);
    border-color: var(--border-hover);
    transform: scale(1.05);
}

.icon-sun,
.icon-moon {
    transition: opacity var(--transition-fast), transform var(--transition-base);
}

[data-theme="dark"] .icon-sun {
    display: none;
}

[data-theme="dark"] .icon-moon {
    display: block;
}

[data-theme="light"] .icon-sun {
    display: block;
}

[data-theme="light"] .icon-moon {
    display: none;
}

/* Mobile Theme Toggle (hidden by default) */
.mobile-theme-wrapper {
    display: none;
}

.mobile-theme-toggle {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 50px;
    cursor: pointer;
    transition: transform 0.15s ease, border-color 0.3s ease, box-shadow 0.3s ease;
    -webkit-tap-highlight-color: transparent;
    -webkit-touch-callout: none;
    user-select: none;
    touch-action: manipulation;
    will-change: transform;
    transform: translateZ(0);
}

.mobile-theme-toggle * {
    pointer-events: none;
}

.mobile-theme-toggle:hover {
    border-color: var(--accent-primary);
    box-shadow: 0 0 20px var(--glow-color);
}

.mobile-theme-toggle:active {
    transform: scale(0.95);
    box-shadow: 0 0 10px var(--glow-color);
}

.toggle-label {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.toggle-label .toggle-icon-sun,
.toggle-label .toggle-icon-moon {
    transition: color 0.2s ease, opacity 0.2s ease;
    transform: translateZ(0);
}

/* Sun icon active in dark mode (to switch to light) */
[data-theme="dark"] .toggle-label .toggle-icon-sun {
    color: var(--text-secondary);
    opacity: 0.5;
}

[data-theme="dark"] .toggle-label .toggle-icon-moon {
    color: var(--accent-primary);
    opacity: 1;
}

/* Moon icon active in light mode (to switch to dark) */
[data-theme="light"] .toggle-label .toggle-icon-sun {
    color: var(--accent-primary);
    opacity: 1;
}

[data-theme="light"] .toggle-label .toggle-icon-moon {
    color: var(--text-secondary);
    opacity: 0.5;
}

.toggle-track {
    width: 50px;
    height: 26px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 50px;
    position: relative;
    transition: background 0.3s ease, border-color 0.3s ease;
    transform: translateZ(0);
}

.toggle-thumb {
    position: absolute;
    top: 2px;
    left: 2px;
    width: 20px;
    height: 20px;
    background: var(--accent-primary);
    border-radius: 50%;
    transition: left 0.25s cubic-bezier(0.4, 0, 0.2, 1), background 0.3s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    will-change: left;
    transform: translateZ(0);
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
}

/* Thumb position based on theme */
[data-theme="light"] .toggle-thumb {
    left: 2px;
}

[data-theme="dark"] .toggle-thumb {
    left: calc(100% - 22px);
}

/* Hamburger Menu */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 30px;
    height: 30px;
    z-index: 1001;
}

.hamburger-line {
    width: 100%;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

.hamburger.active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.hamburger.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================
   Main Content & Pages
   ============================================ */

.main-content {
    position: relative;
    z-index: 1;
    padding-top: 70px;
    min-height: calc(100vh - 70px);
}

.page {
    display: none;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity var(--transition-base), transform var(--transition-base);
    padding: 4rem 2rem;
    min-height: calc(100vh - 70px - 80px);
}

.page.active {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   Home Page
   ============================================ */

.home-container {
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding-top: 2rem;
}

/* Avatar */
.avatar-container {
    position: relative;
    margin-bottom: 2rem;
}

.avatar-ring {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 160px;
    height: 160px;
    border-radius: 50%;
    border: 2px solid var(--accent-primary);
    animation: pulse-ring 2s ease-out infinite;
}

.avatar-ring.small {
    width: 130px;
    height: 130px;
}

@keyframes pulse-ring {
    0% {
        transform: translate(-50%, -50%) scale(1);
        opacity: 1;
    }
    100% {
        transform: translate(-50%, -50%) scale(1.3);
        opacity: 0;
    }
}

.avatar {
    position: relative;
    width: 140px;
    height: 140px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 3px solid var(--accent-primary);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-glow);
}

.avatar.small {
    width: 110px;
    height: 110px;
}

.avatar-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.avatar-initials {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-primary);
    display: none;
}

.avatar.small .avatar-initials {
    font-size: 2rem;
}

.avatar-image.hidden {
    display: none;
}

.avatar-image.hidden + .avatar-initials {
    display: flex;
}

/* Hero Text */
.hero-name {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    letter-spacing: 0.05em;
}

.hero-position {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    color: var(--accent-primary);
    margin-bottom: 1rem;
    letter-spacing: 0.1em;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin-bottom: 3rem;
    line-height: 1.8;
}

/* Skills Grid */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    width: 100%;
}

.skill-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.5rem;
    text-align: left;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.skill-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at top left, var(--accent-subtle), transparent 50%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

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

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

.skill-card-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
    position: relative;
    z-index: 1;
}

.skill-icon {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--tag-bg);
    border: 1px solid var(--tag-border);
    border-radius: 12px;
    color: var(--accent-primary);
}

.skill-title {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.5;
    margin: 0;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    position: relative;
    z-index: 1;
}

.tag {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    padding: 0.35rem 0.75rem;
    background: var(--tag-bg);
    border: 1px solid var(--tag-border);
    border-radius: 6px;
    color: var(--tag-text);
    transition: all var(--transition-fast);
}

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

/* ============================================
   About Page
   ============================================ */

.about-container {
    max-width: 1000px;
    margin: 0 auto;
}

.about-grid {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 4rem;
    align-items: start;
}

.about-left {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
    position: sticky;
    top: 100px;
}

.about-avatar-container {
    position: relative;
}

.stats-row {
    display: flex;
    gap: 1.5rem;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.stat-number {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--accent-primary);
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

.about-right {
    padding-top: 1rem;
}

.section-label {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--accent-primary);
    text-transform: uppercase;
    letter-spacing: 0.15em;
    display: block;
    margin-bottom: 0.75rem;
}

.section-title {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
}

.about-content p {
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
    line-height: 1.8;
}

.about-content p:last-child {
    margin-bottom: 2rem;
}

.personality-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.personality-tag {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    padding: 0.5rem 1rem;
    background: var(--tag-bg);
    border: 1px solid var(--tag-border);
    border-radius: 8px;
    color: var(--tag-text);
}

/* ============================================
   Page Header (Shared)
   ============================================ */

.page-header {
    text-align: center;
    margin-bottom: 3rem;
}

.page-header .section-label {
    margin-bottom: 0.5rem;
}

.page-header .section-title {
    margin-bottom: 1rem;
}

.section-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ============================================
   Certifications Page
   ============================================ */

.certifications-container {
    max-width: 900px;
    margin: 0 auto;
}

.cert-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    min-height: 200px;
}

.cert-loading {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
}

.cert-error {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem 2rem;
    text-align: center;
    color: var(--text-secondary);
}

.cert-error svg {
    color: var(--accent-primary);
    margin-bottom: 1rem;
}

.cert-error h3 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.cert-error code {
    font-family: var(--font-mono);
    background: var(--tag-bg);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    color: var(--accent-primary);
}

.cert-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.75rem;
    text-align: center;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.cert-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at center, var(--accent-subtle), transparent 60%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

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

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

.cert-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.25rem;
    position: relative;
    z-index: 1;
}

.cert-badge {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 600;
    padding: 0.3rem 0.6rem;
    border-radius: 4px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.cert-badge.active {
    background: var(--success-bg);
    color: var(--success-color);
    border: 1px solid var(--success-color);
}

.cert-badge.expired {
    background: rgba(239, 68, 68, 0.15);
    color: #ef4444;
    border: 1px solid #ef4444;
}

.cert-year {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-muted);
}

.cert-badge-image {
    width: 100px;
    height: 100px;
    margin: 0 auto 1rem;
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.cert-badge-image img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: 8px;
}

.cert-badge-placeholder {
    display: none;
    width: 80px;
    height: 80px;
    align-items: center;
    justify-content: center;
    background: var(--tag-bg);
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    color: var(--accent-primary);
}

.cert-name {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    position: relative;
    z-index: 1;
    flex-grow: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.cert-issuer {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--accent-primary);
    margin-bottom: 1rem;
    position: relative;
    z-index: 1;
}

.cert-description {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
    position: relative;
    z-index: 1;
    margin-bottom: 1rem;
}

.cert-verify-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--accent-primary);
    padding: 0.5rem 1rem;
    background: var(--accent-subtle);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    transition: all var(--transition-fast);
    position: relative;
    z-index: 1;
    margin-top: auto;
}

.cert-verify-btn:hover {
    background: var(--tag-bg);
    border-color: var(--accent-primary);
    transform: translateY(-2px);
    color: var(--accent-primary);
}

/* ============================================
   Projects Page
   ============================================ */

.projects-container {
    max-width: 900px;
    margin: 0 auto;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    min-height: 200px;
}

.projects-loading {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
}

.projects-error {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem 2rem;
    text-align: center;
    color: var(--text-secondary);
}

.projects-error svg {
    color: var(--accent-primary);
    margin-bottom: 1rem;
}

.projects-error h3 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.projects-error code {
    font-family: var(--font-mono);
    background: var(--tag-bg);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    color: var(--accent-primary);
}

.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.75rem;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at top right, var(--accent-subtle), transparent 50%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

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

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

.project-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    position: relative;
    z-index: 1;
}

.project-category {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    padding: 0.3rem 0.6rem;
    background: var(--tag-bg);
    border: 1px solid var(--tag-border);
    border-radius: 4px;
    color: var(--tag-text);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.project-status {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 600;
    padding: 0.3rem 0.6rem;
    border-radius: 4px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.project-status.active,
.project-status.completed {
    background: var(--success-bg);
    color: var(--success-color);
    border: 1px solid var(--success-color);
}

.project-name {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    position: relative;
    z-index: 1;
}

.project-description {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1rem;
    position: relative;
    z-index: 1;
    flex-grow: 1;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.25rem;
    position: relative;
    z-index: 1;
}

.project-links {
    display: flex;
    gap: 1rem;
    position: relative;
    z-index: 1;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--accent-primary);
    padding: 0.5rem 1rem;
    background: var(--accent-subtle);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    transition: all var(--transition-fast);
}

.project-link:hover {
    background: var(--tag-bg);
    border-color: var(--accent-primary);
    transform: translateY(-2px);
}

/* ============================================
   Blog Page
   ============================================ */

.blog-container {
    max-width: 900px;
    margin: 0 auto;
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    min-height: 200px;
}

.blog-loading {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 1rem;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.blog-error {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem 2rem;
    text-align: center;
    color: var(--text-secondary);
}

.blog-error svg {
    color: var(--accent-primary);
    margin-bottom: 1rem;
}

.blog-error h3 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.blog-error code {
    font-family: var(--font-mono);
    background: var(--tag-bg);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    color: var(--accent-primary);
}

.blog-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
}

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

.blog-card-image {
    width: 100%;
    height: 160px;
    object-fit: cover;
    background: var(--bg-secondary);
}

.blog-card-content {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.blog-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 0.75rem;
}

.blog-date,
.blog-read-time {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
}

.blog-title {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.blog-excerpt {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1rem;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    flex-grow: 1;
}

.blog-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--accent-primary);
    transition: gap var(--transition-fast);
}

.blog-link:hover {
    gap: 0.75rem;
}

/* Lao Language Support */
.blog-card.lang-lao .blog-title,
.blog-card.lang-lao .blog-excerpt {
    font-family: var(--font-lao);
}

.blog-cta {
    text-align: center;
    margin-top: 2.5rem;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    color: var(--bg-primary);
    background: var(--accent-primary);
    padding: 1rem 2rem;
    border-radius: 12px;
    transition: all var(--transition-base);
    box-shadow: 0 4px 15px var(--accent-glow);
}

.cta-button:hover {
    color: var(--bg-primary);
    background: var(--accent-secondary);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--accent-glow);
}

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

.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 1.5rem 2rem;
    position: relative;
    z-index: 1;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.copyright {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    background: var(--accent-subtle);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.social-link:hover {
    background: var(--tag-bg);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    transform: translateY(-2px);
}

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

@media (max-width: 900px) {
    .skills-grid,
    .cert-grid,
    .projects-grid,
    .blog-grid {
        grid-template-columns: 1fr;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }

    .about-left {
        position: static;
    }

    .stats-row {
        justify-content: center;
    }

    .about-right {
        text-align: center;
    }

    .personality-tags {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .theme-toggle {
        display: none;
    }

    .mobile-theme-wrapper {
        display: block;
        margin-top: 1rem;
    }

    .nav-links {
        position: fixed;
        top: 70px;
        right: 0;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--bg-primary);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 2rem;
        transform: translateX(100%);
        transition: transform var(--transition-base);
        z-index: 999;
    }

    .nav-links.active {
        transform: translateX(0);
    }

    .nav-link {
        font-size: 1.5rem;
        font-weight: 600;
        padding: 1rem 3rem;
        color: var(--text-primary);
        background: transparent;
        border: 1px solid transparent;
        border-radius: 12px;
        transition: all var(--transition-fast);
    }

    .nav-link:hover,
    .nav-link.active {
        color: var(--accent-primary);
        background: var(--accent-subtle);
        border-color: var(--border-color);
    }

    .nav-link:active {
        background: var(--accent-primary);
        color: var(--bg-primary);
        border-color: var(--accent-primary);
        transform: scale(0.95);
    }

    .nav-link::after {
        display: none;
    }

    .hero-name {
        font-size: 2.25rem;
    }

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

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

    .page {
        padding: 3rem 1.25rem;
    }

    .footer-container {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

    .glow-1,
    .glow-2,
    .glow-3 {
        opacity: 0.3;
    }
}

@media (max-width: 480px) {
    .nav-container {
        padding: 0 1rem;
    }

    .hero-name {
        font-size: 1.75rem;
    }

    .skill-card,
    .cert-card,
    .project-card {
        padding: 1.25rem;
    }

    .skill-card-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }

    .stats-row {
        flex-direction: column;
        gap: 1rem;
    }

    .project-links {
        flex-direction: column;
    }

    .project-link {
        justify-content: center;
    }
}

/* ============================================
   Page Transition Animations
   ============================================ */

.page.fade-in {
    animation: fadeIn var(--transition-base) ease forwards;
}

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

/* Card Reveal Animation */
.skill-card,
.cert-card,
.project-card,
.blog-card {
    opacity: 0;
    animation: cardReveal 0.5s ease forwards;
}

.skill-card:nth-child(1),
.cert-card:nth-child(1),
.project-card:nth-child(1),
.blog-card:nth-child(1) {
    animation-delay: 0.1s;
}

.skill-card:nth-child(2),
.cert-card:nth-child(2),
.project-card:nth-child(2),
.blog-card:nth-child(2) {
    animation-delay: 0.2s;
}

.skill-card:nth-child(3),
.cert-card:nth-child(3),
.project-card:nth-child(3),
.blog-card:nth-child(3) {
    animation-delay: 0.3s;
}

.skill-card:nth-child(4),
.cert-card:nth-child(4),
.project-card:nth-child(4),
.blog-card:nth-child(4) {
    animation-delay: 0.4s;
}

@keyframes cardReveal {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================
   Accessibility
   ============================================ */

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

    .avatar-ring {
        animation: none;
    }
}

/* Focus styles */
:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

button:focus-visible,
a:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

/* ============================================
   Scrollbar Styling
   ============================================ */

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-primary);
}

/* Firefox */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) var(--bg-secondary);
}