/* ============================================================
   RAJ KUMAR NELLURI — PORTFOLIO STYLESHEET
   Dark Theme | Modern ML/DE Engineer Portfolio
   ============================================================ */

/* === CSS VARIABLES === */
:root {
    --bg-primary:    #0a0e1a;
    --bg-secondary:  #0f1629;
    --bg-card:       #141e30;
    --bg-card-hover: #1a2540;
    --accent-blue:   #3b82f6;
    --accent-cyan:   #06b6d4;
    --accent-green:  #10b981;
    --accent-purple: #8b5cf6;
    --accent-orange: #f59e0b;
    --accent-red:    #ef4444;
    --text-primary:  #f1f5f9;
    --text-secondary:#94a3b8;
    --text-muted:    #64748b;
    --border:        #1e293b;
    --border-hover:  #334155;
    --shadow-sm:     0 1px 3px rgba(0,0,0,0.4);
    --shadow-md:     0 4px 16px rgba(0,0,0,0.5);
    --shadow-lg:     0 8px 32px rgba(0,0,0,0.6);
    --radius-sm:     6px;
    --radius-md:     12px;
    --radius-lg:     16px;
    --radius-xl:     24px;
    --font-sans:     'Inter', system-ui, sans-serif;
    --font-mono:     'JetBrains Mono', 'Fira Code', monospace;
    --transition:    0.25s ease;
}

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

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

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

ul { list-style: none; }

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

/* === SCROLLBAR === */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--border-hover); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent-blue); }

/* ============================================================
   NAVIGATION
   ============================================================ */
#navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: transparent;
    transition: background var(--transition), box-shadow var(--transition), backdrop-filter var(--transition);
}

#navbar.scrolled {
    background: rgba(10, 14, 26, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    box-shadow: 0 1px 0 var(--border);
}

.nav-inner {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 2rem;
    height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
    display: flex;
    align-items: center;
    gap: 4px;
    font-family: var(--font-mono);
}

.logo-dot {
    color: var(--accent-blue);
    font-size: 1.4rem;
    line-height: 1;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-links a {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    padding: 6px 14px;
    border-radius: var(--radius-sm);
    transition: color var(--transition), background var(--transition);
}

.nav-links a:hover {
    color: var(--text-primary);
    background: rgba(255,255,255,0.05);
}

.open-badge {
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: var(--accent-green);
    padding: 4px 10px;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.02em;
}

.badge-pulse {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--accent-green);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50%       { opacity: 0.5; transform: scale(0.85); }
}

.nav-cta {
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Hamburger (hidden on desktop) */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 4px;
}

.hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================================================
   LAYOUT UTILITIES
   ============================================================ */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section {
    padding: 100px 0;
    background: var(--bg-primary);
}

.section-alt {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.section-label {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent-blue);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    background: rgba(59, 130, 246, 0.08);
    border: 1px solid rgba(59, 130, 246, 0.2);
    padding: 4px 12px;
    border-radius: 999px;
    margin-bottom: 16px;
}

.section-title {
    font-size: clamp(1.75rem, 3vw, 2.5rem);
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.03em;
    line-height: 1.2;
    margin-bottom: 12px;
}

.section-subtitle {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 560px;
    line-height: 1.7;
}

.text-center { text-align: center; }
.text-center .section-subtitle { margin: 0 auto; }

/* ============================================================
   SCROLL REVEAL
   ============================================================ */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 11px 22px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    border: none;
    white-space: nowrap;
    text-decoration: none;
}

.btn-primary {
    background: var(--accent-blue);
    color: #fff;
}
.btn-primary:hover {
    background: #2563eb;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.35);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-hover);
}
.btn-outline:hover {
    border-color: var(--accent-blue);
    color: var(--accent-blue);
    background: rgba(59, 130, 246, 0.06);
}

.btn-ghost {
    background: rgba(255,255,255,0.05);
    color: var(--text-secondary);
    border: 1px solid var(--border);
}
.btn-ghost:hover {
    background: rgba(255,255,255,0.1);
    color: var(--text-primary);
}

/* ============================================================
   HERO SECTION
   ============================================================ */
#home {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    padding-top: 68px;
}

.hero-grid-bg {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(59,130,246,0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(59,130,246,0.04) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
}

.hero-grid-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(59,130,246,0.08) 0%, transparent 70%);
}

.hero-inner {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 60px;
    align-items: center;
    padding: 80px 2rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.hero-text { max-width: 640px; }

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(59, 130, 246, 0.08);
    border: 1px solid rgba(59, 130, 246, 0.2);
    color: var(--accent-blue);
    padding: 6px 14px;
    border-radius: 999px;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    margin-bottom: 24px;
}

.badge-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent-blue);
    animation: pulse 2s infinite;
}

.hero-text h1 {
    font-size: clamp(2.2rem, 5vw, 3.8rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.04em;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.gradient-text {
    background: linear-gradient(135deg, var(--accent-blue) 0%, var(--accent-cyan) 50%, var(--accent-purple) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-text h2 {
    font-size: clamp(1.1rem, 2vw, 1.4rem);
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 20px;
    letter-spacing: -0.01em;
}

.hero-text p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.75;
    margin-bottom: 36px;
    max-width: 520px;
}

.hero-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 48px;
}

.hero-scroll {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
}

.hero-scroll span {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--text-muted);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--accent-blue), transparent);
    animation: scrollPulse 2s ease infinite;
}

@keyframes scrollPulse {
    0%, 100% { opacity: 1; }
    50%       { opacity: 0.3; }
}

/* Hero Photo */
.hero-photo {
    position: relative;
    flex-shrink: 0;
}

.photo-ring {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    padding: 4px;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan), var(--accent-purple));
    animation: float 6s ease-in-out infinite;
    box-shadow: 0 0 60px rgba(59,130,246,0.2);
}

.photo-ring img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--bg-primary);
}

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

.photo-tag {
    position: absolute;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 8px 14px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-primary);
    box-shadow: var(--shadow-md);
    white-space: nowrap;
    backdrop-filter: blur(8px);
}

.photo-tag-icon { font-size: 1.1rem; }

.tag-aws    { top: 10%;  right: -40px; }
.tag-ml     { bottom: 20%; left: -50px; }
.tag-open   { top: 50%;  right: -60px; }

/* ============================================================
   ABOUT SECTION
   ============================================================ */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: 60px;
    align-items: start;
}

.about-text p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 20px;
}

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

.about-stats-panel {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 22px 18px;
    transition: border-color var(--transition), transform var(--transition);
}

.stat-card:hover {
    border-color: var(--accent-blue);
    transform: translateY(-3px);
}

.stat-number {
    font-size: 2rem;
    font-weight: 800;
    color: var(--accent-blue);
    letter-spacing: -0.03em;
    line-height: 1;
    margin-bottom: 6px;
}

.stat-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.stat-sub {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* ============================================================
   SKILLS / TECH STACK SECTION
   ============================================================ */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.skill-card-wide {
    grid-column: span 2;
}

.skill-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 26px;
    transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.skill-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.skill-card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 18px;
}

.skill-card-header .icon {
    font-size: 1.4rem;
}

.skill-card-header h3 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

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

.tag {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 600;
    font-family: var(--font-mono);
    border: 1px solid;
}

.tag-blue   { background: rgba(59,130,246,0.1);  border-color: rgba(59,130,246,0.3);  color: #93c5fd; }
.tag-purple { background: rgba(139,92,246,0.1);  border-color: rgba(139,92,246,0.3);  color: #c4b5fd; }
.tag-cyan   { background: rgba(6,182,212,0.1);   border-color: rgba(6,182,212,0.3);   color: #67e8f9; }
.tag-orange { background: rgba(245,158,11,0.1);  border-color: rgba(245,158,11,0.3);  color: #fcd34d; }
.tag-green  { background: rgba(16,185,129,0.1);  border-color: rgba(16,185,129,0.3);  color: #6ee7b7; }
.tag-red    { background: rgba(239,68,68,0.1);   border-color: rgba(239,68,68,0.3);   color: #fca5a5; }

/* ============================================================
   PROJECTS SECTION
   ============================================================ */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 24px;
}

.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.project-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.project-card-top {
    padding: 24px 24px 0 24px;
    flex: 1;
}

.project-card-bottom {
    padding: 0 24px 24px 24px;
}

/* Left border accent color per project */
.project-card.accent-red    { border-left: 3px solid var(--accent-red); }
.project-card.accent-blue   { border-left: 3px solid var(--accent-blue); }
.project-card.accent-green  { border-left: 3px solid var(--accent-green); }
.project-card.accent-orange { border-left: 3px solid var(--accent-orange); }
.project-card.accent-purple { border-left: 3px solid var(--accent-purple); }

.project-badge {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 999px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: 14px;
}

.badge-red    { background: rgba(239,68,68,0.12);  color: #fca5a5; border: 1px solid rgba(239,68,68,0.25); }
.badge-blue   { background: rgba(59,130,246,0.12); color: #93c5fd; border: 1px solid rgba(59,130,246,0.25); }
.badge-green  { background: rgba(16,185,129,0.12); color: #6ee7b7; border: 1px solid rgba(16,185,129,0.25); }
.badge-orange { background: rgba(245,158,11,0.12); color: #fcd34d; border: 1px solid rgba(245,158,11,0.25); }
.badge-purple { background: rgba(139,92,246,0.12); color: #c4b5fd; border: 1px solid rgba(139,92,246,0.25); }

.project-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
    margin-bottom: 6px;
}

.project-tech {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--accent-cyan);
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    margin-bottom: 12px;
}

.project-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
}

.project-metrics {
    display: flex;
    gap: 20px;
    padding: 14px 0;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.metric {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.metric-value {
    font-family: var(--font-mono);
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
}

.metric-label {
    font-size: 0.72rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.project-card-bottom {
    display: flex;
    gap: 10px;
}

.btn-case-study, .btn-github {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    border: 1px solid;
}

.btn-case-study {
    background: var(--accent-blue);
    color: #fff;
    border-color: var(--accent-blue);
    flex: 1;
    justify-content: center;
}
.btn-case-study:hover {
    background: #2563eb;
    box-shadow: 0 4px 14px rgba(59,130,246,0.3);
}

.btn-github {
    background: transparent;
    color: var(--text-secondary);
    border-color: var(--border-hover);
}
.btn-github:hover {
    color: var(--text-primary);
    border-color: var(--text-secondary);
    background: rgba(255,255,255,0.04);
}

/* ============================================================
   ARCHITECTURE SECTION
   ============================================================ */
.pipeline-wrapper {
    overflow-x: auto;
    padding-bottom: 8px;
    margin-bottom: 60px;
}

.pipeline {
    display: flex;
    align-items: center;
    gap: 0;
    min-width: 800px;
    padding: 8px 0;
}

.pipeline-step {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 18px 16px;
    min-width: 140px;
    text-align: center;
    transition: border-color var(--transition), transform var(--transition);
    cursor: default;
    flex: 1;
}

.pipeline-step:hover {
    border-color: var(--accent-blue);
    transform: translateY(-3px);
}

.step-num {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--accent-blue);
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 8px;
}

.step-icon-box {
    font-size: 1.5rem;
    margin-bottom: 8px;
}

.step-name {
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.step-services {
    font-size: 0.72rem;
    color: var(--text-muted);
    line-height: 1.5;
}

.pipeline-arrow {
    flex-shrink: 0;
    color: var(--accent-blue);
    font-size: 1.2rem;
    opacity: 0.5;
    padding: 0 4px;
}

/* Architecture Project Cards */
.arch-section-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 20px;
    font-family: var(--font-mono);
}

.arch-projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.arch-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 22px;
    transition: border-color var(--transition);
}

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

.arch-card-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.arch-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}

.arch-flow {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 12px;
}

.arch-service {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: var(--radius-sm);
    background: rgba(59,130,246,0.1);
    color: #93c5fd;
    border: 1px solid rgba(59,130,246,0.2);
}

.arch-arr {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.arch-desc {
    font-size: 0.82rem;
    color: var(--text-muted);
    line-height: 1.6;
}

/* ============================================================
   CAPABILITIES SECTION
   ============================================================ */
.caps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.cap-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.cap-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.cap-card.cap-blue   { border-top: 3px solid var(--accent-blue); }
.cap-card.cap-blue:hover { border-color: var(--accent-blue); }

.cap-card.cap-cyan   { border-top: 3px solid var(--accent-cyan); }
.cap-card.cap-cyan:hover { border-color: var(--accent-cyan); }

.cap-card.cap-purple { border-top: 3px solid var(--accent-purple); }
.cap-card.cap-purple:hover { border-color: var(--accent-purple); }

.cap-icon {
    font-size: 2rem;
    margin-bottom: 16px;
    display: block;
}

.cap-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

.cap-card > p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
}

.cap-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.cap-list li {
    font-size: 0.85rem;
    color: var(--text-secondary);
    padding-left: 16px;
    position: relative;
    line-height: 1.5;
}

.cap-list li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--accent-blue);
    font-size: 0.7rem;
    top: 3px;
}

.cap-card.cap-cyan  .cap-list li::before { color: var(--accent-cyan); }
.cap-card.cap-purple .cap-list li::before { color: var(--accent-purple); }

/* ============================================================
   CONTACT SECTION
   ============================================================ */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.contact-info h3 {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 10px;
    letter-spacing: -0.02em;
}

.contact-cta-box {
    background: rgba(59,130,246,0.06);
    border: 1px solid rgba(59,130,246,0.15);
    border-radius: var(--radius-md);
    padding: 20px;
    margin-bottom: 28px;
}

.cta-text {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    transition: border-color var(--transition), transform var(--transition);
    text-decoration: none;
}

.contact-link:hover {
    border-color: var(--accent-blue);
    transform: translateX(4px);
}

.contact-link-icon {
    font-size: 1.3rem;
    width: 36px;
    height: 36px;
    background: rgba(59,130,246,0.1);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-link-label {
    font-size: 0.72rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 600;
    display: block;
    margin-bottom: 2px;
}

.contact-link-value {
    font-size: 0.9rem;
    color: var(--text-primary);
    font-weight: 500;
}

/* Contact Form */
.contact-form {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
}

.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
    letter-spacing: 0.02em;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 11px 14px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.9rem;
    transition: border-color var(--transition);
    outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(59,130,246,0.12);
}

.form-group textarea {
    min-height: 130px;
    resize: vertical;
}

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

.submit-btn {
    width: 100%;
    justify-content: center;
    font-size: 0.95rem;
    padding: 13px;
}

/* ============================================================
   FOOTER
   ============================================================ */
footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
}

.footer-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.footer-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 40px 0;
    border-bottom: 1px solid var(--border);
    flex-wrap: wrap;
    gap: 24px;
}

.footer-brand {}

.footer-logo {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    font-family: var(--font-mono);
    letter-spacing: -0.02em;
    margin-bottom: 6px;
}

.footer-brand p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.footer-links {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.footer-links a {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border: 1px solid var(--border);
    border-radius: 999px;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-secondary);
    transition: all var(--transition);
}

.footer-links a:hover {
    border-color: var(--accent-blue);
    color: var(--accent-blue);
    background: rgba(59,130,246,0.06);
}

.footer-bottom {
    padding: 20px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

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

.footer-stack {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.footer-stack span {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.footer-stack code {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    background: var(--bg-card);
    color: var(--accent-cyan);
    padding: 2px 8px;
    border-radius: 4px;
    border: 1px solid var(--border);
}

/* ============================================================
   MODAL (CASE STUDY POPUP)
   ============================================================ */
.modal {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 2000;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    overflow-y: auto;
    padding: 40px 20px;
}

.modal.active { display: flex; align-items: flex-start; justify-content: center; }

.modal-box {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    width: 100%;
    max-width: 720px;
    box-shadow: var(--shadow-lg);
    animation: modalIn 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    overflow: hidden;
}

@keyframes modalIn {
    from { opacity: 0; transform: scale(0.92) translateY(-16px); }
    to   { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 34px;
    height: 34px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1.1rem;
    color: var(--text-secondary);
    transition: all var(--transition);
    line-height: 1;
}
.modal-close:hover { color: var(--text-primary); background: var(--bg-card); }

.modal-header {
    padding: 28px 28px 0 28px;
    position: relative;
    margin-bottom: 20px;
}

.modal-badge {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 999px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: 12px;
}

.modal-title {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.03em;
    margin-bottom: 8px;
}

.modal-stack {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--accent-cyan);
    font-weight: 600;
    letter-spacing: 0.06em;
}

.modal-metrics {
    display: flex;
    gap: 0;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.modal-metric {
    flex: 1;
    padding: 16px;
    text-align: center;
    border-right: 1px solid var(--border);
}
.modal-metric:last-child { border-right: none; }

.modal-metric-val {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--text-primary);
    display: block;
    margin-bottom: 4px;
}

.modal-metric-lbl {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.modal-sections {
    padding: 24px 28px 28px 28px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.modal-section h4 {
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--accent-blue);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    margin-bottom: 8px;
    font-family: var(--font-mono);
}

.modal-section p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.75;
}

.modal-section ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 7px;
}

.modal-section ul li {
    font-size: 0.88rem;
    color: var(--text-secondary);
    padding-left: 16px;
    position: relative;
    line-height: 1.6;
}

.modal-section ul li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--accent-blue);
    font-size: 0.75rem;
    top: 2px;
}

.modal-arch {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    align-items: center;
}

.modal-arch .arch-service { font-size: 0.75rem; }
.modal-arch .arch-arr { color: var(--text-muted); font-size: 0.9rem; }

/* ============================================================
   RESPONSIVE — TABLET & MOBILE
   ============================================================ */
@media (max-width: 1024px) {
    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .skill-card-wide {
        grid-column: span 2;
    }
    .caps-grid {
        grid-template-columns: 1fr 1fr;
    }
    .caps-grid .cap-card:last-child {
        grid-column: span 2;
        max-width: 400px;
        margin: 0 auto;
    }
    .about-grid {
        grid-template-columns: 1fr;
    }
    .about-stats-panel {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (max-width: 768px) {
    /* Navigation */
    .nav-links,
    .nav-cta {
        display: none;
    }

    .nav-links.mobile-open {
        display: flex;
        flex-direction: column;
        position: fixed;
        top: 68px;
        left: 0;
        width: 100%;
        background: rgba(10, 14, 26, 0.97);
        backdrop-filter: blur(16px);
        padding: 20px 2rem;
        gap: 4px;
        border-bottom: 1px solid var(--border);
        z-index: 999;
    }

    .nav-links.mobile-open a {
        padding: 12px 16px;
        border-radius: var(--radius-sm);
        font-size: 1rem;
    }

    .hamburger { display: flex; }

    /* Hero */
    .hero-inner {
        grid-template-columns: 1fr;
        padding: 60px 2rem 80px;
        text-align: center;
        justify-items: center;
    }

    .hero-text { order: 2; text-align: center; }
    .hero-photo { order: 1; }

    .hero-buttons { justify-content: center; }
    .hero-scroll { align-items: center; }

    .photo-ring {
        width: 220px;
        height: 220px;
    }

    .tag-aws  { top: 5%;  right: -20px; }
    .tag-ml   { bottom: 10%; left: -20px; }
    .tag-open { display: none; }

    /* Sections */
    .section, .section-alt { padding: 70px 0; }

    /* About */
    .about-stats-panel {
        grid-template-columns: 1fr 1fr;
    }

    /* Skills */
    .skills-grid {
        grid-template-columns: 1fr;
    }
    .skill-card-wide { grid-column: span 1; }

    /* Projects */
    .projects-grid {
        grid-template-columns: 1fr;
    }

    /* Capabilities */
    .caps-grid {
        grid-template-columns: 1fr;
    }
    .caps-grid .cap-card:last-child {
        grid-column: span 1;
        max-width: 100%;
        margin: 0;
    }

    /* Contact */
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    /* Footer */
    .footer-top {
        flex-direction: column;
        align-items: flex-start;
        gap: 24px;
    }
    .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
    }

    /* Pipeline */
    .pipeline {
        min-width: 600px;
    }
    .pipeline-step {
        min-width: 100px;
        padding: 14px 10px;
    }

    /* Modal */
    .modal-box { border-radius: var(--radius-lg); }
    .modal-metrics { flex-wrap: wrap; }
    .modal-metric { min-width: 50%; border-bottom: 1px solid var(--border); }
    .modal-metric:nth-child(even) { border-right: none; }
}

@media (max-width: 480px) {
    .container { padding: 0 1.25rem; }

    .hero-text h1 { font-size: 2rem; }
    .hero-text h2 { font-size: 1rem; }

    .photo-ring {
        width: 180px;
        height: 180px;
    }

    .photo-tag { font-size: 0.7rem; padding: 6px 10px; }
    .tag-aws  { right: -10px; top: 5%; }
    .tag-ml   { left: -10px; bottom: 10%; }

    .about-stats-panel { grid-template-columns: 1fr 1fr; }

    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }
    .btn { width: 100%; justify-content: center; }

    .modal { padding: 20px 12px; }
    .modal-header { padding: 20px 20px 0; }
    .modal-sections { padding: 20px; }
}