/* ========================================
   Apple Design System
   Clean, White, Elegant
======================================== */
:root {
    /* Apple Colors */
    --color-background: #ffffff;
    --color-background-secondary: #f5f5f7;
    --color-background-tertiary: #fbfbfd;

    --color-text-primary: #1d1d1f;
    --color-text-secondary: #6e6e73;
    --color-text-tertiary: #86868b;

    --color-link: #0066cc;
    --color-link-hover: #0077ed;
    --color-blue: #0071e3;
    --color-blue-hover: #0077ed;

    --color-border: rgba(0, 0, 0, 0.08);
    --color-border-strong: rgba(0, 0, 0, 0.12);
    --color-separator: #d2d2d7;

    /* Apple Typography - SF Pro */
    --font-sf: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Helvetica Neue', 'Helvetica', 'Arial', sans-serif;
    --font-sf-mono: 'SF Mono', ui-monospace, 'Menlo', 'Monaco', monospace;

    /* Apple Spacing */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;
    --space-12: 48px;
    --space-16: 64px;
    --space-20: 80px;
    --space-24: 96px;
    --space-32: 128px;

    /* Apple Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --radius-xl: 22px;
    --radius-full: 980px;

    /* Apple Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Apple Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
    --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.06);

    /* ─── Liquid Glass Theme ─── */

    /* Liquid Primary - Solid core button */
    --liquid-primary: 213, 80%, 55%;
    --liquid-primary-foreground: 0, 0%, 100%;
    --liquid-primary-hover: 213, 80%, 50%;
    --liquid-primary-active: 213, 80%, 45%;

    /* Liquid Secondary - Solid muted button */
    --liquid-secondary: 215, 20%, 65%;
    --liquid-secondary-foreground: 0, 0%, 100%;
    --liquid-secondary-hover: 215, 20%, 58%;
    --liquid-secondary-active: 215, 20%, 52%;

    /* Liquid Accent - Solid violet button */
    --liquid-accent: 262, 83%, 58%;
    --liquid-accent-foreground: 0, 0%, 100%;
    --liquid-accent-hover: 262, 83%, 52%;
    --liquid-accent-active: 262, 83%, 46%;

    /* Liquid Surface */
    --liquid-foreground: 222, 84%, 5%;

    /* Liquid Glass Frame (outer frosted border) */
    --liquid-frame: hsla(221, 60%, 80%, 0.35);
    --liquid-frame-border: hsla(0, 0%, 100%, 0.5);
    --liquid-frame-shadow: hsla(221, 83%, 53%, 0.12);

    /* Liquid Glass Effects */
    --liquid-blur: 16px;
    --liquid-saturate: 180%;
    --liquid-shine: hsla(0, 0%, 100%, 0.25);
    --liquid-reflection: hsla(0, 0%, 100%, 0.4);

    /* Liquid Card */
    --liquid-card-bg: hsla(210, 40%, 98%, 0.6);
    --liquid-card-border: hsla(0, 0%, 100%, 0.5);
    --liquid-card-shadow: hsla(221, 83%, 53%, 0.08);

    /* Liquid Badge */
    --liquid-badge-bg: hsla(213, 80%, 55%, 0.12);
    --liquid-badge-foreground: hsl(213, 80%, 40%);
    --liquid-badge-border: hsla(213, 80%, 55%, 0.25);

    /* Liquid Input */
    --liquid-input-bg: hsla(0, 0%, 100%, 0.5);
    --liquid-input-border: hsla(0, 0%, 100%, 0.4);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sf);
    background-color: var(--color-background);
    color: var(--color-text-primary);
    line-height: 1.47059;
    font-weight: 400;
    letter-spacing: -0.022em;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

/* ========================================
   Navigation - Apple Style
======================================== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 9999;
    background: rgba(255, 255, 255, 0.72);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--color-border);
}

.nav-container {
    max-width: 980px;
    margin: 0 auto;
    padding: 0 var(--space-6);
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-size: 21px;
    font-weight: 600;
    color: var(--color-text-primary);
    text-decoration: none;
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    gap: var(--space-8);
}

.nav-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 12px;
    font-weight: 400;
    letter-spacing: -0.01em;
    transition: color var(--transition-fast);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-2);
}

.nav-toggle span {
    width: 18px;
    height: 1.5px;
    background: var(--color-text-primary);
    border-radius: 1px;
    transition: var(--transition-fast);
}

/* ========================================
   Hero Section - Apple Style
======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: var(--space-12) var(--space-6);
    padding-top: calc(var(--space-12) + 48px);
    background: var(--color-background);
    text-align: center;
}

.hero-content {
    max-width: 980px;
    margin: 0 auto;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero-visual {
    margin-bottom: var(--space-8);
}

.hero-avatar {
    position: relative;
}

.avatar-image {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
    box-shadow: var(--shadow-lg);
}

.avatar-placeholder {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background: var(--color-background-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 48px;
    font-weight: 600;
    color: var(--color-text-tertiary);
    box-shadow: var(--shadow-lg);
}

.hero-text {
    max-width: 700px;
    text-align: center;
}

.hero-greeting {
    font-size: 17px;
    font-weight: 400;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-3);
    letter-spacing: -0.01em;
}

.hero-name {
    font-size: 56px;
    font-weight: 600;
    letter-spacing: -0.04em;
    line-height: 1.07143;
    color: var(--color-text-primary);
    margin-bottom: var(--space-4);
}

.hero-title {
    font-size: 28px;
    font-weight: 400;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-6);
    letter-spacing: -0.02em;
    line-height: 1.14286;
}

.hero-description {
    font-size: 21px;
    font-weight: 400;
    color: var(--color-text-tertiary);
    line-height: 1.381;
    letter-spacing: 0.011em;
    max-width: 600px;
    margin: 0 auto var(--space-6);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--space-16);
    margin-bottom: var(--space-6);
}

.stat {
    text-align: center;
}

.stat-value {
    display: block;
    font-size: 28px;
    font-weight: 600;
    color: var(--color-text-primary);
    letter-spacing: -0.02em;
    line-height: 1.14286;
}

.stat-label {
    display: block;
    font-size: 12px;
    font-weight: 400;
    color: var(--color-text-tertiary);
    margin-top: var(--space-1);
    letter-spacing: -0.01em;
}

.hero-cta {
    display: flex;
    gap: var(--space-4);
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-full);
    font-size: 17px;
    font-weight: 400;
    text-decoration: none;
    transition: all var(--transition-fast);
    cursor: pointer;
    border: none;
    letter-spacing: -0.01em;
    min-width: 140px;
}

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

.btn-primary:hover {
    background: var(--color-blue-hover);
}

.btn-secondary {
    background: transparent;
    color: var(--color-blue);
    border: none;
}

.btn-secondary:hover {
    text-decoration: underline;
}

.hero-scroll {
    position: absolute;
    bottom: var(--space-10);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    color: var(--color-text-tertiary);
    font-size: 11px;
    font-weight: 400;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.scroll-line {
    width: 1px;
    height: 32px;
    background: linear-gradient(to bottom, var(--color-text-tertiary), transparent);
    animation: scroll-pulse 2s ease infinite;
}

@keyframes scroll-pulse {
    0%, 100% { opacity: 1; transform: scaleY(1); }
    50% { opacity: 0.5; transform: scaleY(0.8); }
}

/* ========================================
   Sections - Apple Style
======================================== */
.section {
    padding: var(--space-10) var(--space-6);
}

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

.container {
    max-width: 980px;
    margin: 0 auto;
}

.section-title {
    font-size: 48px;
    font-weight: 600;
    letter-spacing: -0.04em;
    line-height: 1.08333;
    color: var(--color-text-primary);
    margin-bottom: var(--space-8);
    text-align: center;
}

.section-title::after {
    display: none;
}

/* ========================================
   About Section - Apple Style
======================================== */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    align-items: start;
}

.about-text p {
    font-size: 17px;
    font-weight: 400;
    color: var(--color-text-secondary);
    line-height: 1.47059;
    letter-spacing: -0.022em;
    margin-bottom: var(--space-6);
}

.about-text p:last-child {
    margin-bottom: 0;
}

.about-skills h3 {
    font-size: 17px;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-6);
    letter-spacing: -0.022em;
}

.skills-grid {
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

.skill-category h4 {
    font-size: 12px;
    font-weight: 600;
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: var(--space-3);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.skill-tags span {
    padding: var(--space-2) var(--space-4);
    background: var(--color-background);
    border-radius: var(--radius-full);
    font-size: 14px;
    font-weight: 400;
    color: var(--color-text-secondary);
    letter-spacing: -0.01em;
    box-shadow: var(--shadow-sm);
}

/* ========================================
   Timeline - Apple Style
======================================== */
.timeline {
    position: relative;
    max-width: 700px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    bottom: 8px;
    width: 2px;
    background: var(--color-separator);
    border-radius: 1px;
}

.timeline-item {
    position: relative;
    padding-left: var(--space-10);
    padding-bottom: var(--space-12);
}

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

.timeline-marker {
    position: absolute;
    left: -5px;
    top: 8px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--color-background);
    border: 2px solid var(--color-blue);
}

.timeline-content {
    background: var(--color-background);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    box-shadow: var(--shadow-card);
}

.section-alt .timeline-content {
    background: var(--color-background);
}

.timeline-header {
    margin-bottom: var(--space-4);
}

.timeline-header h3 {
    font-size: 21px;
    font-weight: 600;
    color: var(--color-text-primary);
    letter-spacing: -0.02em;
    margin-bottom: var(--space-1);
}

.timeline-company {
    display: block;
    font-size: 17px;
    font-weight: 400;
    color: var(--color-blue);
    margin-bottom: var(--space-2);
    letter-spacing: -0.01em;
}

.timeline-date {
    display: block;
    font-size: 14px;
    font-weight: 400;
    color: var(--color-text-tertiary);
    letter-spacing: -0.01em;
}

.timeline-content p {
    font-size: 15px;
    font-weight: 400;
    color: var(--color-text-secondary);
    line-height: 1.47059;
    letter-spacing: -0.01em;
}

/* ========================================
   Projects Grid - Apple Style
======================================== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-5);
}

.project-card {
    background: var(--color-background);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    text-decoration: none;
    color: inherit;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-card);
}

.project-card:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-lg);
}

.project-icon {
    width: 48px;
    height: 48px;
    margin-bottom: var(--space-4);
    color: var(--color-blue);
}

.project-icon svg {
    width: 100%;
    height: 100%;
}

.project-card h3 {
    font-size: 17px;
    font-weight: 600;
    color: var(--color-text-primary);
    letter-spacing: -0.022em;
    margin-bottom: var(--space-2);
}

.project-card p {
    font-size: 14px;
    font-weight: 400;
    color: var(--color-text-secondary);
    line-height: 1.42859;
    letter-spacing: -0.01em;
    margin-bottom: var(--space-4);
}

.project-tag {
    display: inline-block;
    padding: var(--space-1) var(--space-3);
    background: var(--color-background-secondary);
    color: var(--color-text-secondary);
    font-size: 12px;
    font-weight: 500;
    border-radius: var(--radius-full);
    margin-right: var(--space-1);
    letter-spacing: 0;
}

.project-highlight {
    background: linear-gradient(135deg, #f5f5f7 0%, #ffffff 100%);
    border: 1px solid var(--color-border);
}

.project-more {
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-background-secondary);
    border: 2px dashed var(--color-separator);
    box-shadow: none;
}

.project-more:hover {
    background: var(--color-background);
    box-shadow: none;
    transform: none;
}

.project-more span {
    color: var(--color-blue);
    font-size: 17px;
    font-weight: 400;
}

/* ========================================
   Accomplishments - Apple Style
======================================== */
.accomplishments-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-5);
}

.accomplishment-card {
    text-align: center;
    padding: var(--space-8);
    background: var(--color-background);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
}

.accomplishment-icon {
    font-size: 40px;
    margin-bottom: var(--space-4);
}

.accomplishment-card h3 {
    font-size: 17px;
    font-weight: 600;
    color: var(--color-text-primary);
    letter-spacing: -0.022em;
    margin-bottom: var(--space-2);
}

.accomplishment-card p {
    font-size: 14px;
    font-weight: 400;
    color: var(--color-text-secondary);
    line-height: 1.42859;
    letter-spacing: -0.01em;
}

/* ========================================
   Contact - Apple Style
======================================== */
.contact-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.contact-intro {
    font-size: 21px;
    font-weight: 400;
    color: var(--color-text-secondary);
    line-height: 1.381;
    letter-spacing: 0.011em;
    margin-bottom: var(--space-10);
}

.contact-links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--space-3);
}

.contact-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    background: var(--color-background-secondary);
    border-radius: var(--radius-full);
    color: var(--color-text-primary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 400;
    transition: all var(--transition-fast);
    letter-spacing: -0.01em;
}

.contact-link:hover {
    background: var(--color-text-primary);
    color: var(--color-background);
}

.contact-link svg {
    width: 16px;
    height: 16px;
}

/* ========================================
   Footer - Apple Style
======================================== */
.footer {
    padding: var(--space-6);
    background: var(--color-background-secondary);
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer p {
    font-size: 12px;
    font-weight: 400;
    color: var(--color-text-tertiary);
    letter-spacing: -0.01em;
}

/* ========================================
   Responsive Design - Apple Style
======================================== */
@media (max-width: 1068px) {
    .hero-name {
        font-size: 48px;
    }

    .hero-title {
        font-size: 24px;
    }

    .hero-description {
        font-size: 19px;
    }

    .section-title {
        font-size: 40px;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: var(--space-10);
    }

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

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

@media (max-width: 734px) {
    :root {
        font-size: 15px;
    }

    .nav-container {
        height: 44px;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(251, 251, 253, 0.98);
        backdrop-filter: saturate(180%) blur(20px);
        -webkit-backdrop-filter: saturate(180%) blur(20px);
        border-bottom: 1px solid var(--color-border);
        flex-direction: column;
        padding: var(--space-5);
        gap: 0;
    }

    .nav-links.active {
        display: flex;
    }

    .nav-links a {
        display: block;
        padding: var(--space-3) 0;
        font-size: 15px;
        border-bottom: 1px solid var(--color-border);
    }

    .nav-links a:last-child {
        border-bottom: none;
    }

    .nav-toggle {
        display: flex;
    }

    .hero {
        padding: var(--space-12) var(--space-5);
        padding-top: calc(var(--space-12) + 44px);
        min-height: auto;
    }

    .hero-name {
        font-size: 32px;
    }

    .hero-title {
        font-size: 19px;
    }

    .hero-description {
        font-size: 17px;
    }

    .hero-stats {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
        gap: var(--space-3);
    }

    .hero-scroll {
        display: none;
    }

    .section {
        padding: var(--space-12) var(--space-5);
    }

    .section-title {
        font-size: 32px;
        margin-bottom: var(--space-8);
    }

    .projects-grid {
        grid-template-columns: 1fr;
        gap: var(--space-3);
    }

    .accomplishments-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-3);
    }

    .project-card {
        padding: var(--space-4);
    }

    .accomplishment-card {
        padding: var(--space-5);
    }

    .timeline::before {
        left: 0;
    }

    .timeline-item {
        padding-left: var(--space-8);
    }

    .timeline-marker {
        left: -5px;
    }

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

    .contact-link {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }

    .btn {
        width: 100%;
        max-width: 280px;
    }

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

    .stat.liquid-stat {
        padding: var(--space-3) var(--space-4);
    }
}

/* ========================================
   Animations - Apple Style (Subtle)
======================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-visual {
    animation: fadeInUp 0.8s ease 0.1s forwards;
    opacity: 0;
}

.hero-text > * {
    animation: fadeInUp 0.6s ease forwards;
    opacity: 0;
}

.hero-greeting { animation-delay: 0.2s; }
.hero-name { animation-delay: 0.3s; }
.hero-title { animation-delay: 0.4s; }
.hero-description { animation-delay: 0.5s; }
.hero-stats { animation-delay: 0.6s; }
.hero-cta { animation-delay: 0.7s; }

/* ========================================
   Focus States - Accessibility
======================================== */
a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--color-blue);
    outline-offset: 2px;
}

/* ========================================
   Selection - Apple Style
======================================== */
::selection {
    background: rgba(0, 113, 227, 0.2);
}

::-moz-selection {
    background: rgba(0, 113, 227, 0.2);
}

/* ========================================
   Liquid Glass Design System
======================================== */

/* Liquid Glass Utility */
.liquid-glass {
    backdrop-filter: blur(var(--liquid-blur)) saturate(var(--liquid-saturate));
    -webkit-backdrop-filter: blur(var(--liquid-blur)) saturate(var(--liquid-saturate));
}

/* Liquid Shine Overlay */
.liquid-shine-overlay {
    background: linear-gradient(
        105deg,
        transparent 30%,
        var(--liquid-shine) 45%,
        transparent 60%
    );
    background-size: 200% 100%;
}

@keyframes liquidShine {
    0% { background-position: -200% center; }
    100% { background-position: 200% center; }
}

/* ─── Liquid Glass Button (Two-Layer) ─── */
.btn-liquid {
    display: inline-flex;
    border-radius: var(--radius-full);
    padding: 4px;
    background: var(--liquid-frame);
    border: 1px solid var(--liquid-frame-border);
    box-shadow: 0 8px 32px var(--liquid-frame-shadow);
    backdrop-filter: blur(var(--liquid-blur)) saturate(var(--liquid-saturate));
    -webkit-backdrop-filter: blur(var(--liquid-blur)) saturate(var(--liquid-saturate));
    transition: box-shadow 0.3s ease;
    text-decoration: none;
}

.btn-liquid:hover {
    box-shadow: 0 12px 40px var(--liquid-frame-shadow);
}

/* Inner Core Button */
.btn-liquid-core {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    white-space: nowrap;
    border-radius: var(--radius-full);
    font-family: var(--font-sf);
    font-weight: 600;
    transition: all 0.3s ease-out;
    cursor: pointer;
    border: none;
    overflow: hidden;
    letter-spacing: -0.01em;
}

.btn-liquid-core:hover {
    transform: scale(1.01);
}

.btn-liquid-core:active {
    transform: scale(0.98);
}

.btn-liquid-core:focus-visible {
    outline: none;
}

/* Button Sizes */
.btn-liquid-core.size-default {
    height: 40px;
    padding: 8px 24px;
    font-size: 15px;
}

.btn-liquid-core.size-sm {
    height: 32px;
    padding: 4px 16px;
    font-size: 13px;
}

.btn-liquid-core.size-lg {
    height: 48px;
    padding: 12px 32px;
    font-size: 17px;
}

/* Primary Variant */
.btn-liquid-core.variant-primary {
    background: hsl(var(--liquid-primary));
    color: hsl(var(--liquid-primary-foreground));
    box-shadow:
        inset 0 1px 0 var(--liquid-reflection),
        0 2px 8px hsla(var(--liquid-primary), 0.3);
}

.btn-liquid-core.variant-primary:hover {
    background: hsl(var(--liquid-primary-hover));
    box-shadow:
        inset 0 1px 0 var(--liquid-reflection),
        0 4px 16px hsla(var(--liquid-primary), 0.35);
}

.btn-liquid-core.variant-primary:active {
    background: hsl(var(--liquid-primary-active));
}

/* Secondary Variant */
.btn-liquid-core.variant-secondary {
    background: hsl(var(--liquid-secondary));
    color: hsl(var(--liquid-secondary-foreground));
    box-shadow:
        inset 0 1px 0 var(--liquid-reflection),
        0 2px 8px hsla(var(--liquid-secondary), 0.3);
}

.btn-liquid-core.variant-secondary:hover {
    background: hsl(var(--liquid-secondary-hover));
    box-shadow:
        inset 0 1px 0 var(--liquid-reflection),
        0 4px 16px hsla(var(--liquid-secondary), 0.35);
}

.btn-liquid-core.variant-secondary:active {
    background: hsl(var(--liquid-secondary-active));
}

/* Accent Variant */
.btn-liquid-core.variant-accent {
    background: hsl(var(--liquid-accent));
    color: hsl(var(--liquid-accent-foreground));
    box-shadow:
        inset 0 1px 0 var(--liquid-reflection),
        0 2px 8px hsla(var(--liquid-accent), 0.3);
}

.btn-liquid-core.variant-accent:hover {
    background: hsl(var(--liquid-accent-hover));
    box-shadow:
        inset 0 1px 0 var(--liquid-reflection),
        0 4px 16px hsla(var(--liquid-accent), 0.35);
}

.btn-liquid-core.variant-accent:active {
    background: hsl(var(--liquid-accent-active));
}

/* Ghost Variant */
.btn-liquid-core.variant-ghost {
    background: transparent;
    color: hsl(var(--liquid-foreground));
}

.btn-liquid-core.variant-ghost:hover {
    background: var(--liquid-frame);
}

/* Shine Overlay inside button */
.btn-liquid-core .shine {
    pointer-events: none;
    position: absolute;
    inset: 0;
    border-radius: var(--radius-full);
    opacity: 0.5;
    background: linear-gradient(
        105deg,
        transparent 30%,
        var(--liquid-shine) 45%,
        transparent 60%
    );
    background-size: 200% 100%;
    transition: opacity 0.3s ease;
}

.btn-liquid:hover .btn-liquid-core .shine {
    animation: liquidShine 1.5s ease-in-out;
}

/* ─── Liquid Glass Card ─── */
.liquid-card {
    border-radius: var(--radius-lg);
    border: 1px solid var(--liquid-card-border);
    background: var(--liquid-card-bg);
    box-shadow:
        0 8px 32px var(--liquid-card-shadow),
        inset 0 1px 0 var(--liquid-reflection);
    backdrop-filter: blur(var(--liquid-blur)) saturate(var(--liquid-saturate));
    -webkit-backdrop-filter: blur(var(--liquid-blur)) saturate(var(--liquid-saturate));
    transition: all var(--transition-base);
}

.liquid-card:hover {
    box-shadow:
        0 12px 40px var(--liquid-card-shadow),
        inset 0 1px 0 var(--liquid-reflection);
    transform: translateY(-2px);
}

/* ─── Liquid Glass Badge ─── */
.liquid-badge {
    display: inline-flex;
    align-items: center;
    border-radius: var(--radius-full);
    padding: var(--space-1) var(--space-3);
    font-size: 12px;
    font-weight: 600;
    border: 1px solid var(--liquid-badge-border);
    background: var(--liquid-badge-bg);
    color: var(--liquid-badge-foreground);
    backdrop-filter: blur(8px) saturate(150%);
    -webkit-backdrop-filter: blur(8px) saturate(150%);
    transition: all var(--transition-fast);
    letter-spacing: 0;
}

/* ─── Liquid Glass Nav ─── */
.nav.liquid-nav {
    background: hsla(210, 40%, 98%, 0.55);
    backdrop-filter: blur(20px) saturate(var(--liquid-saturate));
    -webkit-backdrop-filter: blur(20px) saturate(var(--liquid-saturate));
    border-bottom: 1px solid var(--liquid-frame-border);
    box-shadow: 0 1px 12px var(--liquid-frame-shadow);
}

/* ─── Liquid Glass Contact Link ─── */
.contact-link.liquid-contact {
    background: var(--liquid-card-bg);
    border: 1px solid var(--liquid-card-border);
    box-shadow:
        0 4px 16px var(--liquid-card-shadow),
        inset 0 1px 0 var(--liquid-reflection);
    backdrop-filter: blur(var(--liquid-blur)) saturate(var(--liquid-saturate));
    -webkit-backdrop-filter: blur(var(--liquid-blur)) saturate(var(--liquid-saturate));
    transition: all var(--transition-base);
}

.contact-link.liquid-contact:hover {
    background: hsl(var(--liquid-primary));
    color: hsl(var(--liquid-primary-foreground));
    border-color: transparent;
    box-shadow: 0 8px 32px hsla(var(--liquid-primary), 0.3);
    transform: translateY(-2px);
}

.contact-link.liquid-contact:hover svg {
    fill: hsl(var(--liquid-primary-foreground));
    stroke: hsl(var(--liquid-primary-foreground));
}

/* ─── Liquid Glass Avatar ─── */
.avatar-liquid-frame {
    display: inline-flex;
    border-radius: 50%;
    padding: 6px;
    background: var(--liquid-frame);
    border: 1px solid var(--liquid-frame-border);
    box-shadow:
        0 12px 40px var(--liquid-frame-shadow),
        inset 0 1px 0 var(--liquid-reflection);
    backdrop-filter: blur(var(--liquid-blur)) saturate(var(--liquid-saturate));
    -webkit-backdrop-filter: blur(var(--liquid-blur)) saturate(var(--liquid-saturate));
}

/* ─── Liquid Glass Stat ─── */
.stat.liquid-stat {
    padding: var(--space-5) var(--space-6);
    border-radius: var(--radius-lg);
    background: var(--liquid-card-bg);
    border: 1px solid var(--liquid-card-border);
    box-shadow:
        0 4px 16px var(--liquid-card-shadow),
        inset 0 1px 0 var(--liquid-reflection);
    backdrop-filter: blur(var(--liquid-blur)) saturate(var(--liquid-saturate));
    -webkit-backdrop-filter: blur(var(--liquid-blur)) saturate(var(--liquid-saturate));
}

/* ─── Liquid Glass Section Background ─── */
.section-liquid-alt {
    background: linear-gradient(
        180deg,
        hsla(210, 40%, 96%, 0.8) 0%,
        hsla(221, 60%, 95%, 0.4) 50%,
        hsla(210, 40%, 96%, 0.8) 100%
    );
}

/* ─── Liquid Glass Footer ─── */
.footer.liquid-footer {
    background: var(--liquid-card-bg);
    border-top: 1px solid var(--liquid-frame-border);
    backdrop-filter: blur(var(--liquid-blur)) saturate(var(--liquid-saturate));
    -webkit-backdrop-filter: blur(var(--liquid-blur)) saturate(var(--liquid-saturate));
}

/* Override liquid-card hover for timeline (prevent layout shift) */
.timeline-content.liquid-card:hover {
    transform: none;
}

/* Override liquid-card hover for project-more */
.project-more.liquid-card:hover {
    transform: none;
    box-shadow: 0 8px 32px var(--liquid-card-shadow);
}