/* ===================================================
   SABA BILAL — PORTFOLIO  |  Premium Dark Theme
   =================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Space+Grotesk:wght@400;500;600;700&display=swap');

:root {
    /* === Color System === */
    --bg-base:      #080c14;
    --bg-surface:   #0d1221;
    --bg-elevated:  #111827;
    --bg-card:      rgba(17, 24, 39, 0.8);
    --bg-glass:     rgba(255, 255, 255, 0.04);
    --bg-glass-hover: rgba(255, 255, 255, 0.07);

    --text-primary:   #f0f4ff;
    --text-secondary: #8b9fc5;
    --text-muted:     #4a5568;

    /* Accent palette — electric indigo → cyan */
    --accent-1:    #6366f1;   /* indigo */
    --accent-2:    #8b5cf6;   /* violet */
    --accent-3:    #06b6d4;   /* cyan */
    --accent-4:    #a78bfa;   /* light violet */

    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #06b6d4 100%);
    --gradient-glow:    linear-gradient(135deg, rgba(99,102,241,0.4) 0%, rgba(139,92,246,0.4) 100%);
    --gradient-card:    linear-gradient(135deg, rgba(99,102,241,0.06) 0%, rgba(6,182,212,0.06) 100%);

    /* Borders */
    --border-subtle: rgba(255,255,255,0.07);
    --border-accent: rgba(99,102,241,0.35);
    --border-glow:   rgba(99,102,241,0.6);

    /* Shadows */
    --shadow-sm:     0 2px 8px rgba(0,0,0,0.4);
    --shadow-md:     0 8px 30px rgba(0,0,0,0.5);
    --shadow-lg:     0 20px 60px rgba(0,0,0,0.6);
    --shadow-glow:   0 0 40px rgba(99,102,241,0.2);
    --shadow-glow-strong: 0 0 60px rgba(99,102,241,0.4);

    /* Typography */
    --font-display: 'Space Grotesk', system-ui, sans-serif;
    --font-body:    'Inter', system-ui, sans-serif;

    /* Spacing */
    --section-padding: 7rem;
    --header-height:   80px;

    /* Radii */
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 22px;
    --radius-xl: 32px;
    --radius-full: 9999px;

    /* Transitions */
    --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
    --ease-out:    cubic-bezier(0.4, 0, 0.2, 1);
    --t-fast: 0.2s var(--ease-out);
    --t-med:  0.35s var(--ease-out);
    --t-slow: 0.6s var(--ease-out);
}

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

html { scroll-behavior: smooth; }

body {
    background-color: var(--bg-base);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* Ambient background orbs */
body::before,
body::after {
    content: '';
    position: fixed;
    border-radius: 50%;
    pointer-events: none;
    z-index: 0;
    filter: blur(120px);
    opacity: 0.12;
}
body::before {
    width: 700px; height: 700px;
    top: -200px; left: -200px;
    background: radial-gradient(circle, #6366f1, transparent 70%);
    animation: orb1 18s ease-in-out infinite alternate;
}
body::after {
    width: 500px; height: 500px;
    bottom: 0; right: -100px;
    background: radial-gradient(circle, #06b6d4, transparent 70%);
    animation: orb2 22s ease-in-out infinite alternate;
}

@keyframes orb1 {
    from { transform: translate(0, 0) scale(1); }
    to   { transform: translate(120px, 80px) scale(1.3); }
}
@keyframes orb2 {
    from { transform: translate(0, 0) scale(1); }
    to   { transform: translate(-80px, -120px) scale(1.2); }
}

/* =============== SCROLLBAR =============== */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: var(--bg-base); }
::-webkit-scrollbar-thumb { background: var(--accent-1); border-radius: 10px; }

/* =============== TYPOGRAPHY =============== */
h1, h2, h3, h4 {
    font-family: var(--font-display);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.15;
}

h1 {
    font-size: clamp(3rem, 7vw, 5.5rem);
    font-weight: 900;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

h2 {
    font-size: clamp(2rem, 4vw, 2.8rem);
    color: var(--text-primary);
    margin-bottom: 1rem;
    position: relative;
    display: inline-block;
}

h2 .section-label {
    display: block;
    font-family: var(--font-body);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--accent-1);
    margin-bottom: 0.6rem;
}

h3 { font-size: 1.25rem; color: var(--text-primary); }

p { color: var(--text-secondary); line-height: 1.8; }

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

/* =============== CONTAINER =============== */
.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* =============== SECTION =============== */
section {
    padding: var(--section-padding) 0;
    position: relative;
    z-index: 1;
}

.section-header {
    margin-bottom: 4rem;
}

/* Divider line accent */
.section-divider {
    width: 60px; height: 3px;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    margin-top: 0.75rem;
}

/* =============== SCROLL ANIMATION =============== */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}
.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* =============== NAVBAR =============== */
nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--header-height);
    z-index: 1000;
    background: rgba(8, 12, 20, 0.7);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border-bottom: 1px solid var(--border-subtle);
    transition: background var(--t-med), box-shadow var(--t-med);
}

nav.scrolled {
    background: rgba(8, 12, 20, 0.92);
    box-shadow: 0 4px 30px rgba(0,0,0,0.5);
}

nav .container {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.03em;
}

.nav-links {
    display: flex;
    gap: 0.25rem;
    align-items: center;
}

.nav-link {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-full);
    transition: color var(--t-fast), background var(--t-fast);
    position: relative;
}

.nav-link:hover {
    color: var(--text-primary);
    background: var(--bg-glass-hover);
}

.nav-link.active {
    color: var(--accent-4);
    background: rgba(99,102,241,0.12);
}

/* Mobile hamburger */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 0.5rem;
}
.nav-toggle span {
    display: block;
    width: 22px; height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--t-med);
}

/* =============== HERO SECTION =============== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: var(--header-height);
    overflow: hidden;
}

.hero-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 1.5rem;
    width: 100%;
    max-width: 780px;
    margin: 0 auto;
}

.hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    background: rgba(99,102,241,0.1);
    border: 1px solid rgba(99,102,241,0.25);
    border-radius: var(--radius-full);
    padding: 0.4rem 1rem;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--accent-4);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    margin-bottom: 1.5rem;
}

.hero-eyebrow::before {
    content: '';
    width: 7px; height: 7px;
    border-radius: 50%;
    background: var(--accent-3);
    box-shadow: 0 0 8px var(--accent-3);
    animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; transform: scale(1); }
    50%       { opacity: 0.5; transform: scale(1.4); }
}

.hero-title {
    margin-bottom: 1.25rem;
}

.hero-subtitle {
    font-size: 1.35rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.5;
}

.hero-subtitle span {
    color: var(--accent-4);
    font-weight: 600;
}

.hero-description {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 560px;
    margin: 0 auto 2.5rem;
    line-height: 1.85;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* Hero Image */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.profile-ring {
    position: relative;
    width: 340px; height: 340px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.profile-ring::before {
    content: '';
    position: absolute;
    inset: -4px;
    border-radius: 50%;
    background: conic-gradient(from 0deg, var(--accent-1), var(--accent-2), var(--accent-3), var(--accent-1));
    animation: spin-ring 6s linear infinite;
    z-index: 0;
}

.profile-ring::after {
    content: '';
    position: absolute;
    inset: 3px;
    border-radius: 50%;
    background: var(--bg-base);
    z-index: 1;
}

@keyframes spin-ring {
    from { transform: rotate(0deg); }
    to   { transform: rotate(360deg); }
}

.profile-img {
    width: 312px; height: 312px;
    object-fit: cover;
    border-radius: 50%;
    position: relative;
    z-index: 2;
    animation: float 6s ease-in-out infinite;
    filter: brightness(1.05) contrast(1.05);
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50%       { transform: translateY(-14px); }
}

/* Floating badges around image */
.hero-badge {
    position: absolute;
    background: rgba(17,24,39,0.9);
    border: 1px solid var(--border-accent);
    border-radius: var(--radius-md);
    padding: 0.6rem 1rem;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-primary);
    backdrop-filter: blur(12px);
    z-index: 10;
    white-space: nowrap;
    box-shadow: var(--shadow-md);
}

.hero-badge .badge-icon {
    font-size: 1rem;
    margin-right: 0.4rem;
}

.badge-ai {
    top: 15%;
    left: -60px;
    animation: badge-float 5s ease-in-out infinite;
}

.badge-cv {
    bottom: 20%;
    right: -55px;
    animation: badge-float 5s ease-in-out infinite 1.5s;
}

.badge-research {
    bottom: 2%;
    left: -40px;
    animation: badge-float 5s ease-in-out infinite 3s;
}

@keyframes badge-float {
    0%, 100% { transform: translateY(0px); }
    50%       { transform: translateY(-8px); }
}

/* Glow behind image */
.hero-glow {
    position: absolute;
    width: 380px; height: 380px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(99,102,241,0.3) 0%, transparent 70%);
    z-index: 0;
    animation: glow-pulse 4s ease-in-out infinite;
}

@keyframes glow-pulse {
    0%, 100% { opacity: 0.4; transform: scale(1); }
    50%       { opacity: 0.7; transform: scale(1.08); }
}

/* =============== BUTTONS =============== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.9rem 2rem;
    border-radius: var(--radius-full);
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 0.875rem;
    letter-spacing: 0.02em;
    cursor: pointer;
    border: none;
    transition: transform var(--t-med), box-shadow var(--t-med), background var(--t-med);
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(255,255,255,0.08);
    opacity: 0;
    transition: opacity var(--t-fast);
}
.btn:hover::after { opacity: 1; }

.btn-primary {
    background: var(--gradient-primary);
    color: #fff;
    box-shadow: 0 4px 20px rgba(99,102,241,0.45);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(99,102,241,0.6);
}
.btn-primary:active { transform: translateY(0); }

.btn-ghost {
    background: var(--bg-glass);
    color: var(--text-primary);
    border: 1px solid var(--border-subtle);
    backdrop-filter: blur(10px);
}
.btn-ghost:hover {
    border-color: var(--border-accent);
    background: var(--bg-glass-hover);
    transform: translateY(-2px);
}

/* =============== ABOUT SECTION =============== */
#about {
    background: var(--bg-surface);
    border-top: 1px solid var(--border-subtle);
    border-bottom: 1px solid var(--border-subtle);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 5rem;
    align-items: center;
}

.about-text p {
    font-size: 1.05rem;
    margin-bottom: 1.25rem;
}

.about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.stat-card {
    background: var(--bg-glass);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    text-align: center;
    transition: border-color var(--t-med), transform var(--t-med), box-shadow var(--t-med);
}
.stat-card:hover {
    border-color: var(--border-accent);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.stat-number {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 900;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: 0.4rem;
}

.stat-label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

/* =============== EXPERIENCE SECTION =============== */
.timeline-wrapper {
    max-width: 720px;
    position: relative;
}

.timeline-wrapper::before {
    content: '';
    position: absolute;
    left: 18px;
    top: 8px;
    bottom: 8px;
    width: 2px;
    background: linear-gradient(to bottom, var(--accent-1), var(--accent-2), transparent);
}

.timeline-entry {
    display: flex;
    gap: 2rem;
    margin-bottom: 2rem;
    position: relative;
}

.timeline-marker {
    flex-shrink: 0;
    width: 38px;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-top: 4px;
}

.timeline-dot {
    width: 14px; height: 14px;
    border-radius: 50%;
    background: var(--gradient-primary);
    box-shadow: 0 0 0 4px var(--bg-base), 0 0 0 6px rgba(99,102,241,0.3);
    flex-shrink: 0;
}

.timeline-body {
    background: var(--bg-glass);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 1.75rem 2rem;
    flex: 1;
    transition: border-color var(--t-med), box-shadow var(--t-med), transform var(--t-med);
}

.timeline-body:hover {
    border-color: var(--border-accent);
    box-shadow: var(--shadow-glow);
    transform: translateX(4px);
}

.timeline-date {
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--accent-3);
    margin-bottom: 0.4rem;
    display: block;
}

.timeline-body h3 {
    font-size: 1.15rem;
    margin-bottom: 0.25rem;
}

.timeline-body h4 {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--accent-4);
    margin-bottom: 0.75rem;
}

.timeline-body p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* =============== EDUCATION SECTION =============== */
#education {
    background: var(--bg-surface);
    border-top: 1px solid var(--border-subtle);
    border-bottom: 1px solid var(--border-subtle);
}

.edu-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.edu-card {
    background: var(--bg-glass);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 2rem;
    position: relative;
    overflow: hidden;
    transition: border-color var(--t-med), box-shadow var(--t-med), transform var(--t-med);
}

.edu-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 3px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--t-med);
}

.edu-card:hover {
    border-color: var(--border-accent);
    box-shadow: var(--shadow-glow);
    transform: translateY(-6px);
}
.edu-card:hover::before { opacity: 1; }

.edu-year {
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--accent-3);
    margin-bottom: 0.75rem;
    display: block;
}

.edu-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.35rem;
}

.edu-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

/* =============== SKILLS SECTION =============== */
.skills-wrapper {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.skills-category h4 {
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.skills-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.skill-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.25rem;
    border-radius: var(--radius-full);
    border: 1px solid var(--border-subtle);
    background: var(--bg-glass);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: default;
    transition: border-color var(--t-med), color var(--t-med), background var(--t-med), transform var(--t-med), box-shadow var(--t-med);
}

.skill-pill:hover {
    border-color: var(--border-accent);
    color: var(--accent-4);
    background: rgba(99,102,241,0.1);
    transform: translateY(-3px);
    box-shadow: 0 4px 16px rgba(99,102,241,0.25);
}

.skill-pill .skill-icon {
    font-size: 1rem;
}

/* =============== PROJECTS SECTION =============== */
#projects { background: var(--bg-surface); }

.projects-bento {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-top: 0;
}

.proj-card {
    background: var(--bg-glass);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    padding: 2rem;
    position: relative;
    overflow: hidden;
    transition: border-color var(--t-med), box-shadow var(--t-slow), transform var(--t-med);
    display: flex;
    flex-direction: column;
    gap: 1rem;
    cursor: default;
}

.proj-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-card);
    opacity: 0;
    transition: opacity var(--t-med);
}

.proj-card:hover {
    border-color: var(--border-accent);
    box-shadow: 0 20px 50px rgba(99,102,241,0.2);
    transform: translateY(-8px);
}
.proj-card:hover::before { opacity: 1; }

.proj-card.featured {
    grid-column: span 2;
}

.proj-num {
    font-family: var(--font-display);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-muted);
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-full);
    padding: 0.3rem 0.75rem;
    display: inline-block;
    width: fit-content;
    position: relative;
    z-index: 1;
}

.proj-card h3 {
    font-size: 1.3rem;
    position: relative;
    z-index: 1;
    transition: color var(--t-fast);
}
.proj-card:hover h3 { color: var(--accent-4); }

.proj-card p {
    font-size: 0.9rem;
    line-height: 1.75;
    flex: 1;
    position: relative;
    z-index: 1;
}

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

.proj-tag {
    font-size: 0.72rem;
    font-weight: 600;
    padding: 0.3rem 0.85rem;
    border-radius: var(--radius-full);
    background: rgba(99,102,241,0.12);
    color: var(--accent-4);
    border: 1px solid rgba(99,102,241,0.2);
    letter-spacing: 0.03em;
}

/* =============== CONTACT SECTION =============== */
#contact {
    text-align: center;
    overflow: hidden;
}

.contact-inner {
    max-width: 640px;
    margin: 0 auto;
}

.contact-description {
    font-size: 1.1rem;
    margin-bottom: 2.5rem;
    line-height: 1.8;
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 3rem;
}

.contact-link {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.85rem 1.75rem;
    border-radius: var(--radius-full);
    border: 1px solid var(--border-subtle);
    background: var(--bg-glass);
    color: var(--text-primary);
    font-weight: 600;
    font-size: 0.9rem;
    transition: border-color var(--t-med), background var(--t-med), transform var(--t-med), box-shadow var(--t-med);
    backdrop-filter: blur(10px);
}

.contact-link:hover {
    border-color: var(--border-accent);
    background: rgba(99,102,241,0.1);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(99,102,241,0.25);
    color: var(--accent-4);
}

.contact-link .link-icon {
    font-size: 1.1rem;
}

.email-display {
    font-size: 1rem;
    font-weight: 600;
    color: var(--accent-4);
    border-bottom: 1px dashed rgba(167,139,250,0.4);
    padding-bottom: 2px;
    transition: color var(--t-fast), border-color var(--t-fast);
}
.email-display:hover {
    color: var(--accent-3);
    border-color: var(--accent-3);
}

/* =============== CONTACT FORM =============== */
.contact-form {
    width: 100%;
    max-width: 580px;
    margin: 2rem auto 0;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
}

.form-label {
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.form-input {
    background: var(--bg-glass);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 0.85rem 1rem;
    font-family: var(--font-body);
    font-size: 0.95rem;
    color: var(--text-primary);
    outline: none;
    transition: border-color var(--t-med), box-shadow var(--t-med), background var(--t-med);
    width: 100%;
    resize: none;
}

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

.form-input:focus {
    border-color: var(--accent-1);
    background: rgba(99,102,241,0.05);
    box-shadow: 0 0 0 3px rgba(99,102,241,0.2);
}

.form-input.is-invalid {
    border-color: #f87171;
    box-shadow: 0 0 0 3px rgba(248,113,113,0.2);
}

.form-textarea { min-height: 140px; }

/* Submit button loading state */
.btn-submit {
    align-self: center;
    min-width: 180px;
    position: relative;
}

.btn-loader {
    display: none;
    width: 18px; height: 18px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

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

.btn-submit.loading .btn-text { display: none; }
.btn-submit.loading .btn-loader { display: block; }
.btn-submit:disabled { opacity: 0.6; cursor: not-allowed; }

/* Toast notification */
.form-toast {
    margin-top: 1rem;
    padding: 0.9rem 1.25rem;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 500;
    text-align: center;
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 0.4s ease, transform 0.4s ease;
    pointer-events: none;
}

.form-toast.show {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.form-toast.success {
    background: rgba(16, 185, 129, 0.12);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: #6ee7b7;
}

.form-toast.error {
    background: rgba(248, 113, 113, 0.12);
    border: 1px solid rgba(248, 113, 113, 0.3);
    color: #fca5a5;
}

@media (max-width: 540px) {
    .form-row { grid-template-columns: 1fr; }
}

/* Big glow accent behind CTA area */
.contact-glow-bg {
    position: absolute;
    width: 600px; height: 300px;
    left: 50%; top: 50%;
    transform: translate(-50%, -50%);
    background: radial-gradient(ellipse, rgba(99,102,241,0.12) 0%, transparent 70%);
    pointer-events: none;
}

/* =============== TAGS (Education cards) =============== */
.badge-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    padding: 0.3rem 0.85rem;
    border-radius: var(--radius-full);
    border: 1px solid;
}

.badge-gold {
    background: rgba(251,191,36,0.12);
    color: #fbbf24;
    border-color: rgba(251,191,36,0.3);
}

.badge-blue {
    background: rgba(6,182,212,0.1);
    color: var(--accent-3);
    border-color: rgba(6,182,212,0.25);
}

/* =============== FOOTER =============== */
footer {
    background: var(--bg-surface);
    border-top: 1px solid var(--border-subtle);
    padding: 2.5rem 0;
    text-align: center;
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-logo {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.footer-heart {
    color: var(--accent-1);
}

/* =============== MOBILE NAV OPEN =============== */
@media (max-width: 768px) {
    .nav-links {
        display: flex;
        flex-direction: column;
        gap: 0;
        position: absolute;
        top: var(--header-height);
        left: 0; right: 0;
        background: rgba(8, 12, 20, 0.97);
        backdrop-filter: blur(24px);
        border-bottom: 1px solid var(--border-subtle);
        padding: 1rem 0;
        transform: translateY(-120%);
        opacity: 0;
        pointer-events: none;
        transition: transform 0.35s var(--ease-out), opacity 0.35s var(--ease-out);
    }
    .nav-links.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }
    .nav-links .nav-link {
        padding: 0.85rem 2rem;
        border-radius: 0;
        font-size: 1rem;
    }
    /* Hamburger → X */
    .nav-toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
    .nav-toggle.is-open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
    .nav-toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}

/* =============== RESPONSIVE =============== */
@media (max-width: 1024px) {
    .hero-inner {
        grid-template-columns: 1fr 1fr;
        gap: 3rem;
    }
    .projects-bento {
        grid-template-columns: repeat(2, 1fr);
    }
    .proj-card.featured {
        grid-column: span 2;
    }
}

@media (max-width: 768px) {
    :root { --section-padding: 5rem; }

    h1 { font-size: 2.8rem; }

    .hero-inner {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 3rem;
    }
    .hero-description { margin: 0 auto 2rem; }
    .hero-cta { justify-content: center; }
    .hero-visual { order: -1; }

    .profile-ring { width: 240px; height: 240px; }
    .profile-img  { width: 216px; height: 216px; }
    .hero-glow    { width: 260px; height: 260px; }

    .badge-ai, .badge-cv, .badge-research { display: none; }

    .about-grid { grid-template-columns: 1fr; gap: 3rem; }

    .nav-links { display: none; }
    .nav-toggle { display: flex; }

    .projects-bento {
        grid-template-columns: 1fr;
    }
    .proj-card.featured { grid-column: span 1; }

    .footer-inner { justify-content: center; text-align: center; }
}

@media (max-width: 480px) {
    .about-stats { grid-template-columns: 1fr 1fr; }
    .edu-grid { grid-template-columns: 1fr; }
}