/* ==========================================
   Design System — Jonathan Ho Resume
   ========================================== */

:root {
    --white: #FFFFFF;
    --light: #F8F9FA;
    --off-white: #FEFEFE;
    --dark: #4A4A4A;
    --text-primary: #5A5A5A;
    --text-secondary: #7A7A7A;
    --accent: #FF6B35;
    --accent-light: #FF8C61;
    --accent-dark: #E85A28;
    --accent-hover: #D94E1F;
    --primary: #1A365D;
    --primary-light: #2D4A7C;
    --primary-dark: #0F2544;
    --gray: #8B8B8B;
    --gray-light: #E5E7EB;
    --gray-medium: #D1D5DB;
    --gray-dark: #6B7280;
    --border-color: #D1D5DB;
    --highlight-teal: #4ECDC4;
    --shadow: rgba(0, 0, 0, 0.08);
    --shadow-dark: rgba(0, 0, 0, 0.15);
    --black-50: rgba(0, 0, 0, 0.5);
    --black-40: rgba(0, 0, 0, 0.4);
    --black-30: rgba(0, 0, 0, 0.3);
    --black-20: rgba(0, 0, 0, 0.2);
    --black-15: rgba(0, 0, 0, 0.15);
    --black-12: rgba(0, 0, 0, 0.12);
    --black-10: rgba(0, 0, 0, 0.1);
    --white-95: rgba(255, 255, 255, 0.95);
    --white-85: rgba(255, 255, 255, 0.85);
    --white-60: rgba(255, 255, 255, 0.60);
    --white-40: rgba(255, 255, 255, 0.40);
    --white-30: rgba(255, 255, 255, 0.30);
    --white-20: rgba(255, 255, 255, 0.20);
    --white-15: rgba(255, 255, 255, 0.15);
    --gradient-primary: linear-gradient(135deg, #1A365D 0%, #2D4A7C 100%);
    --gradient-accent: linear-gradient(135deg, #FF6B35 0%, #FF8C61 100%);
    --gradient-hero: linear-gradient(180deg, rgba(26, 54, 93, 0.4) 0%, rgba(26, 54, 93, 0.85) 100%);
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', sans-serif;
    --font-display: 'Playfair Display', 'Cormorant Garamond', Georgia, serif;
    --font-heading: 'Playfair Display', 'Cormorant Garamond', Georgia, serif;
    --font-weight-light: 300;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 600;
    --letter-spacing-tight: -0.02em;
    --letter-spacing-normal: 0;
    --letter-spacing-wide: 0.03em;
    --letter-spacing-wider: 0.08em;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    --spacing-2xl: 8rem;
    --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 20px;
    --radius-full: 50%;
    --glass-bg: rgba(255, 255, 255, 0.2);
    --glass-border: rgba(255, 255, 255, 0.4);
    --glass-hover-bg: rgba(255, 255, 255, 0.3);
    --glass-hover-border: rgba(255, 255, 255, 0.6);
    --btn-padding-lg: 1.125rem 3rem;
    --btn-padding-md: 0.875rem 2rem;
    --btn-padding-sm: 0.625rem 1.25rem;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.15);
    --train-icon-size: 37.5px;
    --content-max-width: 1000px;
}

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

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

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

body {
    font-family: var(--font-main);
    line-height: 1.7;
    color: var(--text-primary);
    background: var(--off-white);
    overflow-x: hidden;
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

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

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: var(--font-weight-regular);
    line-height: 1.15;
    margin-bottom: var(--spacing-md);
    letter-spacing: var(--letter-spacing-tight);
}

h1 { font-size: clamp(2.75rem, 7vw, 5.5rem); font-weight: var(--font-weight-light); letter-spacing: -0.03em; }
h2 { font-size: clamp(2.25rem, 5.5vw, 4rem); font-weight: var(--font-weight-regular); letter-spacing: -0.02em; }
h3 { font-size: clamp(1.75rem, 4vw, 2.5rem); font-weight: var(--font-weight-medium); letter-spacing: -0.01em; }
h4 { font-size: clamp(1.25rem, 3vw, 1.75rem); font-weight: var(--font-weight-semibold); letter-spacing: 0; }
h5, h6 { font-weight: var(--font-weight-semibold); }

p {
    font-size: clamp(1rem, 2vw, 1.125rem);
    line-height: 1.8;
    letter-spacing: var(--letter-spacing-normal);
    margin-bottom: var(--spacing-sm);
}

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

.container {
    max-width: var(--content-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

.section { padding: var(--spacing-xl) 0; }

.section-title { margin-bottom: var(--spacing-md); color: var(--dark); }

.section-subtitle {
    font-size: 1.25rem;
    color: var(--gray);
    max-width: var(--content-max-width);
    margin: 0 auto var(--spacing-lg);
}

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

.hero {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.resume-hero-background {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background:
        linear-gradient(180deg, rgba(10, 24, 56, 0.6) 0%, rgba(10, 24, 56, 0.92) 100%),
        radial-gradient(ellipse at 20% 50%, rgba(45, 74, 124, 0.8) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 20%, rgba(255, 107, 53, 0.15) 0%, transparent 50%),
        #0a1838;
    animation: heroGradientShift 12s ease infinite;
}

@keyframes heroGradientShift {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.03); }
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: var(--white);
    padding: var(--spacing-md);
}

.hero-eyebrow {
    font-family: var(--font-main);
    font-size: 0.875rem;
    font-weight: var(--font-weight-semibold);
    letter-spacing: var(--letter-spacing-wider);
    text-transform: uppercase;
    color: var(--accent-light);
    margin-bottom: var(--spacing-sm);
    opacity: 0;
    animation: fadeInUp 1s ease forwards;
}

.hero-title {
    color: var(--white);
    text-shadow: 0 4px 20px var(--black-50);
    margin-bottom: var(--spacing-sm);
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2.5vw, 1.5rem);
    font-weight: 300;
    margin-bottom: var(--spacing-xs);
    text-shadow: 0 2px 10px var(--black-50);
    color: rgba(255,255,255,0.9);
}

.hero-location {
    font-size: 1.1rem;
    color: var(--accent-light);
    margin-bottom: var(--spacing-lg);
    text-shadow: 0 2px 10px var(--black-50);
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
}

/* ==========================================
   Button System
   ========================================== */

.cta-button,
.cta-button-secondary {
    display: inline-block;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-wider);
    font-size: 0.875rem;
    border-radius: 50px;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    text-decoration: none;
    cursor: pointer;
    border: 1px solid transparent;
    font-family: var(--font-main);
    position: relative;
}

.cta-button {
    padding: var(--btn-padding-lg);
    background: linear-gradient(135deg, rgba(255, 107, 53, 0.8), rgba(255, 107, 53, 0.9));
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: var(--white);
    border: 1px solid rgba(255, 107, 53, 0.5);
    box-shadow: 0 4px 16px rgba(255, 107, 53, 0.3), 0 2px 8px rgba(0, 0, 0, 0.1);
}

.cta-button:hover {
    background: linear-gradient(135deg, rgba(255, 107, 53, 0.9), rgba(230, 90, 45, 0.95));
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 8px 32px rgba(255, 107, 53, 0.4), 0 4px 16px rgba(0, 0, 0, 0.15);
}

.cta-button-secondary {
    padding: var(--btn-padding-lg);
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: var(--white);
    border: 1px solid rgba(255, 255, 255, 0.25);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.cta-button-secondary:hover {
    background: rgba(255, 255, 255, 0.25);
    border: 1px solid rgba(255, 255, 255, 0.4);
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
}

/* ==========================================
   Scroll Indicator
   ========================================== */

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
}

.scroll-indicator span {
    display: block;
    width: 30px;
    height: 50px;
    border: 2px solid var(--white);
    border-radius: 25px;
    position: relative;
}

.scroll-indicator span::before {
    content: '';
    position: absolute;
    top: 10px;
    left: 50%;
    width: 6px;
    height: 10px;
    background: var(--white);
    border-radius: 3px;
    transform: translateX(-50%);
    animation: scroll 2s infinite;
}

@keyframes scroll {
    0% { top: 10px; opacity: 1; }
    100% { top: 30px; opacity: 0; }
}

/* ==========================================
   Fade-in Animations
   ========================================== */

.fade-in          { animation: fadeInUp 1s ease forwards; }
.fade-in-delay    { animation: fadeInUp 1s ease 0.3s forwards; opacity: 0; }
.fade-in-delay-2  { animation: fadeInUp 1s ease 0.6s forwards; opacity: 0; }
.fade-in-delay-3  { animation: fadeInUp 1s ease 0.9s forwards; opacity: 0; }

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

/* ==========================================
   Scroll Reveal
   ========================================== */

.reveal {
    opacity: 0;
    transform: translateY(50px);
    transition: var(--transition-slow);
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* ==========================================
   Metro Track Navigation
   ========================================== */

.page-metro-track {
    position: fixed;
    left: 50px;
    top: 0;
    height: 100vh;
    z-index: 900;
    opacity: 0;
    animation: fadeInTrack 1s ease 1s forwards;
}

@keyframes fadeInTrack {
    from { opacity: 0; transform: translateX(-20px); }
    to   { opacity: 1; transform: translateX(0); }
}

.page-track-line {
    position: absolute;
    left: 50%;
    top: 0; bottom: 0;
    width: 2px;
    background: var(--primary);
    transform: translateX(-50%);
    border-radius: 1px;
}

.page-train-indicator { display: none; }

.page-train-indicator::before {
    content: '🚈';
    position: absolute;
    left: 50%; top: 50%;
    transform: translate(-50%, -50%);
    font-size: var(--train-icon-size);
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 15;
}

.page-metro-stops {
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 100%;
    padding: 2vh 0;
}

.page-metro-stop {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    height: 4vh;
    padding: 1vh;
    margin: -1vh;
}

.page-stop-node {
    width: 12px; height: 12px;
    background: var(--accent);
    border: 2px solid var(--accent);
    border-radius: 50%;
    flex-shrink: 0;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    z-index: 3;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0;
}

.page-metro-stop-start .page-stop-node,
.page-metro-stop-end .page-stop-node {
    width: 12px; height: 12px;
    font-size: 0;
    background: var(--accent);
    border: 2px solid var(--accent);
    box-shadow: 0 2px 8px rgba(26, 54, 93, 0.2);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.page-metro-stop-end .page-stop-node {
    animation: pulseDestination 2s ease-in-out infinite;
}

.page-metro-stop-start.active .page-stop-node,
.page-metro-stop-end.active .page-stop-node {
    width: 16px; height: 16px;
    font-size: 0;
    background: var(--accent);
    border-color: var(--accent);
    border-width: 3px;
}

.page-metro-stop-start:hover .page-stop-node,
.page-metro-stop-end:hover .page-stop-node {
    transform: translateX(-50%) scale(1.15);
}

.page-stop-label {
    position: absolute;
    left: calc(50% + 20px);
    top: 50%;
    transform: translate(-10px, -50%);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    text-align: left;
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    white-space: nowrap;
    pointer-events: none;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.4);
    padding: 10px 16px;
    border-radius: 50px;
    box-shadow: 0 2px 12px var(--black-15);
}

.page-stop-name {
    font-family: var(--font-main);
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--dark);
    letter-spacing: 0.02em;
    line-height: 1.2;
}

.page-stop-subtitle {
    font-family: var(--font-main);
    font-size: 0.75rem;
    color: var(--gray);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    line-height: 1.3;
    margin-top: 2px;
}

.page-metro-stop:hover .page-stop-node {
    transform: translateX(-50%) scale(1.3);
    border-color: var(--primary);
    background: var(--primary-light);
}

.page-metro-stop:hover .page-stop-label {
    opacity: 1;
    transform: translate(0, -50%) scale(1.02);
    pointer-events: auto;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    box-shadow: 0 8px 32px var(--black-20);
}

.page-metro-stop.active .page-stop-node {
    width: 16px; height: 16px;
    background: var(--accent);
    border-color: var(--accent);
    border-width: 3px;
    transform: translateX(-50%);
}

.page-metro-stop.active:hover .page-stop-label {
    opacity: 1;
    transform: translate(0, -50%);
    pointer-events: auto;
}

.page-metro-stop.active .page-stop-name {
    color: var(--accent);
    font-weight: var(--font-weight-semibold);
}

.page-metro-stop.destination .page-stop-name {
    color: var(--primary);
    font-weight: var(--font-weight-semibold);
}

.page-metro-stop.destination:hover .page-stop-label,
.page-metro-stop.destination.active:hover .page-stop-label {
    opacity: 1;
    transform: translate(0, -50%);
}

@keyframes pulseDestination {
    0%, 100% { box-shadow: 0 0 0 0 rgba(26, 54, 93, 0.4); }
    50%       { box-shadow: 0 0 0 8px rgba(26, 54, 93, 0); }
}

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

.experience-section {
    background: var(--white);
}

.experience-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.experience-card {
    background: var(--light);
    border-radius: var(--radius-xl);
    padding: var(--spacing-md);
    border-left: 4px solid var(--accent);
    box-shadow: var(--shadow-md);
    transition: transform 0.3s var(--ease-out-expo), box-shadow 0.3s var(--ease-out-expo);
}

.experience-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.experience-card-header {
    margin-bottom: var(--spacing-sm);
}

.experience-role {
    font-family: var(--font-display);
    font-size: clamp(1.1rem, 2vw, 1.4rem);
    font-weight: var(--font-weight-medium);
    color: var(--dark);
    margin-bottom: 0.25rem;
}

.experience-company {
    font-family: var(--font-main);
    font-size: 1rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: 0.25rem;
}

.experience-dates {
    font-family: var(--font-main);
    font-size: 0.875rem;
    color: var(--gray);
    letter-spacing: 0.02em;
}

.experience-bullets {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.experience-bullets li {
    font-size: clamp(0.9rem, 1.5vw, 1rem);
    line-height: 1.7;
    color: var(--text-primary);
    padding-left: 1.5rem;
    position: relative;
}

.experience-bullets li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-size: 0.75rem;
    top: 0.3rem;
}

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

.skills-section {
    background: var(--light);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.skill-group {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-md);
    transition: transform 0.3s var(--ease-out-expo), box-shadow 0.3s var(--ease-out-expo);
}

.skill-group:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.skill-group-title {
    font-family: var(--font-main);
    font-size: 0.875rem;
    font-weight: var(--font-weight-semibold);
    color: var(--primary);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.skill-group-emoji {
    font-size: 1rem;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.skill-tag {
    display: inline-block;
    padding: 0.35rem 0.85rem;
    background: var(--light);
    border: 1px solid var(--border-color);
    border-radius: 50px;
    font-family: var(--font-main);
    font-size: 0.8rem;
    font-weight: var(--font-weight-medium);
    color: var(--text-primary);
    transition: var(--transition-fast);
    cursor: default;
}

.skill-tag:hover {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
}

/* ==========================================
   Education Section
   ========================================== */

.education-section {
    background: var(--white);
}

.education-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.education-card {
    background: var(--light);
    border-radius: var(--radius-xl);
    padding: var(--spacing-md);
    border-left: 4px solid var(--primary);
    box-shadow: var(--shadow-md);
    transition: transform 0.3s var(--ease-out-expo), box-shadow 0.3s var(--ease-out-expo);
}

.education-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.education-school {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: var(--font-weight-medium);
    color: var(--primary);
    margin-bottom: 0.4rem;
}

.education-degree {
    font-family: var(--font-main);
    font-size: 1rem;
    font-weight: var(--font-weight-semibold);
    color: var(--dark);
    margin-bottom: 0.4rem;
    line-height: 1.4;
}

.education-dates {
    font-size: 0.875rem;
    color: var(--gray);
    margin-bottom: 0.6rem;
}

.education-gpa {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--accent);
    color: var(--white);
    border-radius: 50px;
    font-family: var(--font-main);
    font-size: 0.8rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: 0.4rem;
}

.education-details {
    list-style: none;
    padding: 0;
    margin-top: 0.5rem;
}

.education-details li {
    font-size: 0.9rem;
    color: var(--text-secondary);
    padding-left: 1rem;
    position: relative;
    line-height: 1.6;
    margin-bottom: 0.2rem;
}

.education-details li::before {
    content: '·';
    position: absolute;
    left: 0;
    color: var(--primary);
}

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

.contact-section {
    background: var(--light);
}

.contact-card {
    background: var(--white);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    max-width: 600px;
    margin: 0 auto;
}

.contact-items {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.contact-icon {
    font-size: 1.5rem;
    width: 40px;
    text-align: center;
    flex-shrink: 0;
}

.contact-info {
    display: flex;
    flex-direction: column;
}

.contact-label {
    font-family: var(--font-main);
    font-size: 0.75rem;
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--gray);
    margin-bottom: 0.15rem;
}

.contact-value {
    font-family: var(--font-main);
    font-size: 1rem;
    color: var(--dark);
    font-weight: var(--font-weight-medium);
}

.contact-link {
    color: var(--primary);
    transition: var(--transition-fast);
}

.contact-link:hover {
    color: var(--accent);
}

.contact-footer {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.contact-footer p {
    font-size: 0.9rem;
    color: var(--gray);
    margin: 0;
}

/* ==========================================
   Mobile Bottom Navigation Bar
   ========================================== */

.bottom-nav {
    display: none;
    position: fixed;
    bottom: 0; left: 0; right: 0;
    z-index: 1000;
    background: rgba(10, 24, 56, 0.95);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border-top: 1px solid rgba(255, 255, 255, 0.15);
    padding-bottom: env(safe-area-inset-bottom, 0px);
    box-shadow: 0 -1px 0 rgba(255, 255, 255, 0.08), 0 -8px 32px rgba(10, 24, 46, 0.4);
}

.bottom-nav-tabs {
    display: flex;
    justify-content: space-around;
    align-items: stretch;
    height: 60px;
}

.bottom-nav-tab {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 3px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px 4px;
    color: rgba(255, 255, 255, 0.75);
    transition: color 0.2s ease;
    -webkit-tap-highlight-color: transparent;
    min-height: 44px;
    -webkit-font-smoothing: antialiased;
}

.bottom-nav-tab.active {
    color: #ffffff;
    text-shadow: 0 0 12px rgba(255, 107, 53, 0.5);
}

.bottom-nav-tab:active { opacity: 0.7; }

.bottom-nav-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
}

.bottom-nav-label {
    font-family: var(--font-main);
    font-size: 0.625rem;
    font-weight: var(--font-weight-semibold);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    line-height: 1;
}

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

@media (max-width: 1024px) {
    .page-metro-track { left: 30px; }
    .container { margin-left: 50px; }
}

@media (max-width: 768px) {
    .container { margin-left: auto; }
    .page-metro-track { display: none; }
    .bottom-nav { display: block; }

    .App {
        padding-bottom: calc(60px + env(safe-area-inset-bottom, 0px));
    }

    .scroll-indicator { display: none; }

    .hero-buttons {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .cta-button,
    .cta-button-secondary {
        padding: 1rem 2rem;
        font-size: 0.8rem;
        width: 100%;
        max-width: 280px;
    }

    .cta-button-secondary {
        border: 1px solid rgba(255, 255, 255, 0.4);
        background: rgba(255, 255, 255, 0.25);
    }

    .skills-grid { grid-template-columns: 1fr; }
    .education-grid { grid-template-columns: 1fr; }

    .contact-card { padding: var(--spacing-md); }

    .section-title { font-size: 1.75rem; font-weight: var(--font-weight-semibold); }
}

@media (max-width: 480px) {
    .hero-title { font-size: 2.5rem; }
    .hero-subtitle { font-size: 1rem; }
    .container { padding: 0 var(--spacing-sm); }
    .experience-card { padding: var(--spacing-sm); }
}