/* ============================================
   Bach Vu - Technology Consulting Portfolio
   Modern / Futuristic Design System
   ============================================ */

/* --- Custom Properties --- */
:root {
    /* Colors */
    --color-bg: #06080d;
    --color-bg-secondary: #0c1018;
    --color-bg-tertiary: #111827;
    --color-surface: rgba(17, 24, 39, 0.6);
    --color-surface-hover: rgba(17, 24, 39, 0.8);
    --color-border: rgba(99, 179, 237, 0.1);
    --color-border-hover: rgba(99, 179, 237, 0.25);

    /* Accent - Electric Cyan/Blue */
    --color-accent: #00d4ff;
    --color-accent-rgb: 0, 212, 255;
    --color-accent-dim: rgba(0, 212, 255, 0.1);
    --color-accent-glow: rgba(0, 212, 255, 0.4);
    --color-accent-secondary: #7c3aed;
    --color-accent-secondary-rgb: 124, 58, 237;

    /* Text */
    --color-text: #e2e8f0;
    --color-text-secondary: #94a3b8;
    --color-text-muted: #64748b;

    /* Typography */
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Spacing */
    --section-padding: 120px;
    --container-max: 1200px;

    /* Transitions */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-main);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    overflow-x: hidden;
}

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

a:hover {
    color: #fff;
}

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

/* --- Utility Classes --- */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

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

/* --- Particle Canvas --- */
#particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* --- Navigation --- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    transition: all var(--transition-base);
}

.nav--scrolled {
    padding: 12px 0;
    background: rgba(6, 8, 13, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
}

.nav__container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav__logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-text);
    letter-spacing: -0.02em;
    text-decoration: none;
}

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

.nav__logo-accent {
    color: var(--color-accent);
    text-shadow: 0 0 20px var(--color-accent-glow);
}

.nav__menu {
    display: flex;
    align-items: center;
    gap: 8px;
    list-style: none;
}

.nav__link {
    padding: 8px 16px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    position: relative;
}

.nav__link:hover {
    color: var(--color-text);
    background: var(--color-accent-dim);
}

.nav__link--cta {
    color: var(--color-bg);
    background: var(--color-accent);
    font-weight: 600;
}

.nav__link--cta:hover {
    color: var(--color-bg);
    background: #fff;
    box-shadow: 0 0 20px var(--color-accent-glow);
}

.nav__toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    z-index: 1001;
}

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

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

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

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

/* --- Hero Section --- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 24px 80px;
    overflow: hidden;
}

.hero__grid-overlay {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(0, 212, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 212, 255, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 40%, rgba(var(--color-accent-rgb), 0.08) 0%, transparent 50%),
                radial-gradient(circle at 70% 60%, rgba(var(--color-accent-secondary-rgb), 0.06) 0%, transparent 50%);
    animation: heroGlow 15s ease-in-out infinite alternate;
}

@keyframes heroGlow {
    0% { transform: translate(0, 0) rotate(0deg); }
    100% { transform: translate(-5%, 5%) rotate(3deg); }
}

.hero__content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    text-align: center;
}

.hero__badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-accent);
    background: var(--color-accent-dim);
    border: 1px solid rgba(var(--color-accent-rgb), 0.2);
    border-radius: 100px;
    margin-bottom: 32px;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

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

@keyframes pulse {
    0%, 100% { opacity: 1; box-shadow: 0 0 0 0 var(--color-accent-glow); }
    50% { opacity: 0.7; box-shadow: 0 0 0 8px transparent; }
}

.hero__title {
    margin-bottom: 24px;
}

.hero__title-line {
    display: block;
    font-size: clamp(3rem, 8vw, 5.5rem);
    font-weight: 800;
    line-height: 1.05;
    letter-spacing: -0.03em;
    background: linear-gradient(135deg, #fff 0%, #94a3b8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero__title-accent {
    display: block;
    font-size: clamp(1.2rem, 3vw, 1.8rem);
    font-weight: 500;
    color: var(--color-accent);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-top: 12px;
    text-shadow: 0 0 30px var(--color-accent-glow);
}

.hero__subtitle {
    font-size: clamp(1rem, 2vw, 1.15rem);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto 40px;
    line-height: 1.8;
}

.hero__actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 64px;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 32px;
    font-family: var(--font-main);
    font-size: 0.95rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-xl);
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    white-space: nowrap;
}

.btn--primary {
    color: var(--color-bg);
    background: var(--color-accent);
    box-shadow: 0 0 30px rgba(var(--color-accent-rgb), 0.3);
}

.btn--primary:hover {
    color: var(--color-bg);
    background: #fff;
    box-shadow: 0 0 40px rgba(var(--color-accent-rgb), 0.5);
    transform: translateY(-2px);
}

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

.btn--ghost:hover {
    color: var(--color-text);
    border-color: var(--color-accent);
    background: var(--color-accent-dim);
}

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

/* --- Hero Stats --- */
.hero__stats {
    display: flex;
    justify-content: center;
    gap: 48px;
}

.hero__stat {
    text-align: center;
}

.hero__stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--color-text);
    line-height: 1;
    font-variant-numeric: tabular-nums;
}

.hero__stat-suffix {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-accent);
}

.hero__stat-label {
    display: block;
    font-size: 0.8rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-top: 4px;
}

/* --- Scroll Indicator --- */
.hero__scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    color: var(--color-text-muted);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.hero__scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--color-accent), transparent);
    animation: scrollLine 2s ease-in-out infinite;
}

@keyframes scrollLine {
    0% { transform: scaleY(0); transform-origin: top; }
    50% { transform: scaleY(1); transform-origin: top; }
    51% { transform: scaleY(1); transform-origin: bottom; }
    100% { transform: scaleY(0); transform-origin: bottom; }
}

/* --- Section Base --- */
.section {
    position: relative;
    padding: var(--section-padding) 0;
    z-index: 1;
}

.section__header {
    text-align: center;
    margin-bottom: 64px;
}

.section__tag {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-accent);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 16px;
}

.section__title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.2;
    margin-bottom: 16px;
}

.section__description {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    max-width: 560px;
    margin: 0 auto;
}

/* --- About Section --- */
.about__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: start;
}

.about__lead {
    font-size: 1.2rem;
    color: var(--color-text);
    line-height: 1.8;
    margin-bottom: 20px;
}

.about__content p {
    color: var(--color-text-secondary);
    margin-bottom: 16px;
}

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

.about__highlight-card {
    padding: 24px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    backdrop-filter: blur(10px);
}

.about__highlight-card:hover {
    border-color: var(--color-border-hover);
    background: var(--color-surface-hover);
    transform: translateX(8px);
    box-shadow: 0 0 30px rgba(var(--color-accent-rgb), 0.05);
}

.about__highlight-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent-dim);
    border-radius: var(--radius-sm);
    color: var(--color-accent);
    margin-bottom: 16px;
}

.about__highlight-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.about__highlight-card p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* --- Services Section --- */
.services {
    background: var(--color-bg-secondary);
}

.services__grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.service-card {
    position: relative;
    padding: 40px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-slow);
    overflow: hidden;
    backdrop-filter: blur(10px);
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.service-card:hover {
    border-color: var(--color-border-hover);
    transform: translateY(-4px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3), 0 0 40px rgba(var(--color-accent-rgb), 0.05);
}

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

.service-card__number {
    position: absolute;
    top: 32px;
    right: 32px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--color-text-muted);
    opacity: 0.5;
}

.service-card__icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent-dim);
    border-radius: var(--radius-md);
    color: var(--color-accent);
    margin-bottom: 24px;
    transition: all var(--transition-base);
}

.service-card:hover .service-card__icon {
    background: rgba(var(--color-accent-rgb), 0.2);
    box-shadow: 0 0 20px var(--color-accent-glow);
}

.service-card__title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: -0.01em;
}

.service-card__description {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    margin-bottom: 20px;
    line-height: 1.7;
}

.service-card__features {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.service-card__features li {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    padding-left: 20px;
    position: relative;
}

.service-card__features li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-accent);
    transform: translateY(-50%);
    opacity: 0.6;
}

/* --- Experience / Timeline --- */
.timeline {
    position: relative;
    max-width: 700px;
    margin: 0 auto;
    padding-left: 40px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 7px;
    top: 0;
    bottom: 0;
    width: 1px;
    background: linear-gradient(to bottom, var(--color-accent), var(--color-border), transparent);
}

.timeline__item {
    position: relative;
    padding-bottom: 48px;
}

.timeline__item:last-child {
    padding-bottom: 0;
}

.timeline__marker {
    position: absolute;
    left: -40px;
    top: 6px;
    width: 15px;
    height: 15px;
    border-radius: 50%;
    background: var(--color-bg);
    border: 2px solid var(--color-accent);
    box-shadow: 0 0 10px var(--color-accent-glow);
    z-index: 1;
}

.timeline__item:first-child .timeline__marker {
    background: var(--color-accent);
    box-shadow: 0 0 20px var(--color-accent-glow);
}

.timeline__content {
    padding: 24px 28px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.timeline__content:hover {
    border-color: var(--color-border-hover);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
}

.timeline__date {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--color-accent);
    letter-spacing: 0.05em;
}

.timeline__title {
    font-size: 1.15rem;
    font-weight: 700;
    margin: 8px 0 12px;
}

.timeline__description {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
}

.timeline__tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.tag {
    padding: 4px 12px;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-accent);
    background: var(--color-accent-dim);
    border-radius: 100px;
    border: 1px solid rgba(var(--color-accent-rgb), 0.15);
}

/* --- Expertise Section --- */
.expertise {
    background: var(--color-bg-secondary);
}

.expertise__grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.expertise__category {
    padding: 32px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.expertise__category:hover {
    border-color: var(--color-border-hover);
}

.expertise__category-title {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 20px;
}

.expertise__category-title svg {
    color: var(--color-accent);
}

.expertise__tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.expertise__tag {
    padding: 8px 16px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.expertise__tag:hover {
    color: var(--color-accent);
    border-color: rgba(var(--color-accent-rgb), 0.3);
    background: var(--color-accent-dim);
    box-shadow: 0 0 15px rgba(var(--color-accent-rgb), 0.1);
}

/* --- Insight Quote --- */
.insight-quote {
    margin-top: 64px;
    text-align: center;
}

.insight-quote blockquote {
    position: relative;
    padding: 48px 40px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.insight-quote blockquote::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
}

.insight-quote blockquote::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
}

.insight-quote p {
    font-size: clamp(1.2rem, 2.5vw, 1.6rem);
    font-weight: 600;
    color: var(--color-text);
    line-height: 1.5;
    letter-spacing: -0.01em;
}

.insight-quote cite {
    display: block;
    margin-top: 16px;
    font-size: 0.95rem;
    font-style: normal;
    font-weight: 500;
    color: var(--color-accent);
}

/* --- Contact Section --- */
.contact__grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 64px;
    align-items: start;
}

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

.contact__info-card {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 20px 24px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.contact__info-card:hover {
    border-color: var(--color-border-hover);
    transform: translateX(4px);
}

.contact__info-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent-dim);
    border-radius: var(--radius-sm);
    color: var(--color-accent);
    flex-shrink: 0;
}

.contact__info-card h4 {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 4px;
}

.contact__info-card a,
.contact__info-card p {
    font-size: 0.95rem;
    color: var(--color-text);
}

.contact__availability {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 24px;
    font-size: 0.9rem;
    color: #34d399;
    background: rgba(52, 211, 153, 0.05);
    border: 1px solid rgba(52, 211, 153, 0.15);
    border-radius: var(--radius-md);
    margin-top: 8px;
}

.contact__availability-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #34d399;
    animation: pulse 2s ease-in-out infinite;
    flex-shrink: 0;
}

/* --- Contact Form --- */
.contact__form {
    padding: 40px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
}

.form__group {
    margin-bottom: 24px;
}

.form__label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: 8px;
    letter-spacing: 0.02em;
}

.form__input {
    width: 100%;
    padding: 14px 18px;
    font-family: var(--font-main);
    font-size: 0.95rem;
    color: var(--color-text);
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    outline: none;
    transition: all var(--transition-fast);
    appearance: none;
    -webkit-appearance: none;
}

.form__input::placeholder {
    color: var(--color-text-muted);
}

.form__input:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(var(--color-accent-rgb), 0.1), 0 0 20px rgba(var(--color-accent-rgb), 0.05);
}

.form__select {
    cursor: pointer;
    background-image: url("data:image/svg+xml,%3Csvg width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    padding-right: 40px;
}

.form__select option {
    background: var(--color-bg-tertiary);
    color: var(--color-text);
}

.form__textarea {
    resize: vertical;
    min-height: 120px;
}

.form__status {
    margin-top: 16px;
    padding: 0;
    font-size: 0.9rem;
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
    overflow: hidden;
    max-height: 0;
}

.form__status--success {
    color: #34d399;
    background: rgba(52, 211, 153, 0.1);
    border: 1px solid rgba(52, 211, 153, 0.2);
    padding: 14px 18px;
    max-height: 100px;
}

.form__status--error {
    color: #f87171;
    background: rgba(248, 113, 113, 0.1);
    border: 1px solid rgba(248, 113, 113, 0.2);
    padding: 14px 18px;
    max-height: 100px;
}

/* --- Footer --- */
.footer {
    position: relative;
    z-index: 1;
    padding: 48px 0 24px;
    border-top: 1px solid var(--color-border);
}

.footer__content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: 24px;
}

.footer__brand p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-top: 8px;
}

.footer__links {
    display: flex;
    gap: 24px;
}

.footer__links a {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

.footer__social {
    display: flex;
    gap: 12px;
}

.footer__social a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 50%;
    transition: all var(--transition-base);
}

.footer__social a:hover {
    color: var(--color-accent);
    border-color: var(--color-accent);
    box-shadow: 0 0 15px rgba(var(--color-accent-rgb), 0.2);
}

.footer__bottom {
    text-align: center;
}

.footer__bottom p {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

/* --- Animations --- */
[data-animate] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-animate].is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- Responsive Design --- */
@media (max-width: 968px) {
    :root {
        --section-padding: 80px;
    }

    .about__grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

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

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

    .contact__grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .footer__content {
        flex-direction: column;
        gap: 24px;
        text-align: center;
    }
}

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

    .nav__menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        flex-direction: column;
        background: var(--color-bg-secondary);
        border-left: 1px solid var(--color-border);
        padding: 80px 32px 32px;
        gap: 4px;
        transition: right var(--transition-base);
    }

    .nav__menu.active {
        right: 0;
    }

    .nav__link {
        padding: 12px 16px;
        font-size: 1rem;
    }

    .hero__stats {
        gap: 24px;
    }

    .hero__stat-number {
        font-size: 2rem;
    }

    .hero__scroll {
        display: none;
    }

    .timeline {
        padding-left: 30px;
    }

    .timeline__marker {
        left: -30px;
        width: 12px;
        height: 12px;
    }

    .service-card {
        padding: 28px;
    }

    .contact__form {
        padding: 28px;
    }
}

@media (max-width: 480px) {
    .hero__stats {
        flex-direction: column;
        gap: 20px;
    }

    .hero__actions {
        flex-direction: column;
        align-items: center;
    }

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