/* =============================================
   MEHMET KANUS — PORTFOLIO v3
   Design: Deep Space Engineering
   Theme: Dark Space · Cyan · Violet
   ============================================= */

:root {
  --bg:           #020817;
  --bg-2:         #071020;
  --bg-3:         #0d1b2e;
  --surface:      #112035;
  --surface-2:    #182e47;
  --border:       rgba(34,211,238,0.08);
  --border-2:     rgba(34,211,238,0.16);
  --border-hover: rgba(34,211,238,0.32);
  --cyan:         #22d3ee;
  --cyan-dim:     rgba(34,211,238,0.1);
  --cyan-glow:    rgba(34,211,238,0.35);
  --violet:       #a78bfa;
  --violet-dim:   rgba(167,139,250,0.1);
  --violet-glow:  rgba(167,139,250,0.3);
  --green:        #34d399;
  --green-dim:    rgba(52,211,153,0.1);
  --red:          #f87171;
  --yellow:       #fbbf24;
  --text-1:       #f0f9ff;
  --text-2:       rgba(240,249,255,0.62);
  --text-3:       rgba(240,249,255,0.28);
  --mono:         'IBM Plex Mono', monospace;
  --display:      'Plus Jakarta Sans', sans-serif;
  --radius:       8px;
  --radius-lg:    16px;
  --radius-xl:    24px;
  --ease:         cubic-bezier(0.4, 0, 0.2, 1);
  --transition:   0.25s var(--ease);
}

/* ── RESET ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--display);
  background: var(--bg);
  color: var(--text-1);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { display: block; max-width: 100%; }
button { font-family: inherit; }

/* ── SCROLLBAR ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-2); }
::-webkit-scrollbar-thumb { background: var(--surface-2); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--cyan); }

/* ── SELECTION ── */
::selection { background: rgba(34,211,238,0.25); color: var(--text-1); }

/* ── GRADIENT TEXT UTILITY ── */
.gradient-text {
  background: linear-gradient(135deg, var(--cyan) 0%, var(--violet) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ── SCROLL ANIMATION CLASSES ── */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-left {
  opacity: 0;
  transform: translateX(-28px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal-left.visible { opacity: 1; transform: translateX(0); }

/* Staggered delays */
.delay-1 { transition-delay: 0.1s !important; }
.delay-2 { transition-delay: 0.2s !important; }
.delay-3 { transition-delay: 0.3s !important; }
.delay-4 { transition-delay: 0.4s !important; }
.delay-5 { transition-delay: 0.5s !important; }
.delay-6 { transition-delay: 0.6s !important; }

/* ── HEADER ── */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 2000;
  background: rgba(2, 8, 23, 0.75);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition), border-color var(--transition);
}

.site-header.scrolled {
  background: rgba(2, 8, 23, 0.92);
  border-bottom-color: var(--border-2);
}

.nav-inner {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 2rem;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.logo {
  font-family: var(--mono);
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 1px;
  transition: opacity var(--transition);
}
.logo:hover { opacity: 0.8; }

.logo-bracket { color: var(--cyan); }
.logo-text { color: var(--text-1); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.2rem;
}

.nav-link {
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-2);
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius);
  transition: color var(--transition), background var(--transition);
  position: relative;
}
.nav-link:hover { color: var(--text-1); background: rgba(34,211,238,0.06); }
.nav-link.active { color: var(--cyan); background: var(--cyan-dim); }

.nav-cta {
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cyan);
  border: 1px solid rgba(34,211,238,0.35);
  padding: 0.4rem 1rem;
  border-radius: var(--radius);
  transition: all var(--transition);
  margin-left: 0.5rem;
}
.nav-cta:hover {
  background: var(--cyan-dim);
  border-color: var(--cyan);
  color: var(--cyan);
  box-shadow: 0 0 20px var(--cyan-glow);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.nav-toggle span {
  display: block;
  width: 22px; height: 2px;
  background: var(--text-1);
  border-radius: 2px;
  transition: var(--transition);
}
.nav-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-toggle.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ── HERO ── */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 100px 2rem 5rem;
  position: relative;
  overflow: hidden;
}

/* Animated background */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 60% at 80% 30%, rgba(34,211,238,0.07) 0%, transparent 55%),
    radial-gradient(ellipse 60% 70% at 15% 75%, rgba(167,139,250,0.07) 0%, transparent 55%),
    radial-gradient(ellipse 40% 40% at 50% 50%, rgba(52,211,153,0.03) 0%, transparent 60%);
  animation: hero-breathe 10s ease-in-out infinite alternate;
  pointer-events: none;
}

@keyframes hero-breathe {
  0%   { opacity: 0.7; transform: scale(1); }
  100% { opacity: 1;   transform: scale(1.05); }
}

/* Dot grid */
.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(34,211,238,0.07) 1px, transparent 1px);
  background-size: 28px 28px;
  pointer-events: none;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 40%, transparent 100%);
}

.hero-inner {
  max-width: 1240px;
  margin: 0 auto;
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 5rem;
  align-items: center;
  position: relative;
  z-index: 1;
}

/* ── HERO TEXT ── */
.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--green);
  background: var(--green-dim);
  border: 1px solid rgba(52,211,153,0.25);
  border-radius: 100px;
  padding: 0.3rem 0.9rem;
  margin-bottom: 1.8rem;
}

.tag-dot {
  width: 7px; height: 7px;
  background: var(--green);
  border-radius: 50%;
  animation: pulse-green 2.5s ease-in-out infinite;
  box-shadow: 0 0 8px var(--green);
}

@keyframes pulse-green {
  0%, 100% { opacity: 1; transform: scale(1); box-shadow: 0 0 8px var(--green); }
  50% { opacity: 0.5; transform: scale(0.75); box-shadow: 0 0 4px var(--green); }
}

.hero-title {
  font-family: var(--display);
  font-size: clamp(2.8rem, 7vw, 6rem);
  font-weight: 800;
  line-height: 0.95;
  letter-spacing: -0.03em;
  margin-bottom: 1.8rem;
}

.hero-title .line-1 {
  display: block;
  color: var(--text-1);
}
.hero-title .line-2 {
  display: block;
  background: linear-gradient(135deg, var(--cyan) 0%, var(--violet) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-role {
  font-family: var(--mono);
  font-size: 0.95rem;
  color: var(--text-2);
  margin-bottom: 1.8rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}
.role-prefix { color: var(--cyan); font-weight: 600; }
.role-text { color: var(--text-1); font-weight: 500; }

.cursor-blink {
  color: var(--cyan);
  animation: blink 1s step-end infinite;
  font-weight: 300;
}
@keyframes blink { 50% { opacity: 0; } }

.hero-bio {
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--text-2);
  max-width: 540px;
  margin-bottom: 2.5rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  align-items: center;
  margin-bottom: 3.5rem;
  flex-wrap: wrap;
}

/* ── BUTTONS ── */
.btn {
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.8rem 1.8rem;
  border-radius: var(--radius);
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, var(--cyan), var(--violet));
  color: #fff;
  box-shadow: 0 0 0 rgba(34,211,238,0);
}
.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--violet), var(--cyan));
  opacity: 0;
  transition: opacity var(--transition);
}
.btn-primary:hover::before { opacity: 1; }
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(34,211,238,0.4);
}
.btn-primary span { position: relative; z-index: 1; }

.btn-ghost {
  background: transparent;
  color: var(--text-2);
  border: 1px solid var(--border-2);
}
.btn-ghost:hover {
  color: var(--text-1);
  border-color: var(--cyan);
  background: var(--cyan-dim);
  transform: translateY(-2px);
}

/* ── HERO STATS ── */
.hero-stats {
  display: flex;
  align-items: center;
  gap: 2.5rem;
}

.stat-num {
  display: block;
  font-family: var(--display);
  font-size: 1.8rem;
  font-weight: 800;
  line-height: 1;
  background: linear-gradient(135deg, var(--cyan), var(--violet));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  display: block;
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-top: 0.3rem;
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: linear-gradient(180deg, transparent, var(--border-2), transparent);
}

/* ── HERO VISUAL ── */
.hero-visual {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  position: sticky;
  top: 88px;
}

/* Profile photo with spinning gradient ring */
.avatar-wrapper {
  position: relative;
  display: flex;
  justify-content: center;
}

.avatar-ring {
  position: relative;
  width: 220px; height: 220px;
  border-radius: 50%;
  flex-shrink: 0;
  align-self: center;
}

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

.avatar-ring::after {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  background: conic-gradient(from 0deg, var(--cyan), var(--violet), var(--green), var(--cyan));
  filter: blur(12px);
  opacity: 0.5;
  animation: ring-spin 4s linear infinite;
  z-index: 0;
}

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

.avatar-ring .avatar-inner {
  position: relative;
  z-index: 1;
  width: 100%; height: 100%;
  border-radius: 50%;
  overflow: hidden;
  background: var(--bg-3);
  padding: 3px;
}

.avatar-ring .avatar-inner::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: var(--bg-3);
  z-index: 0;
}

.avatar-ring img {
  position: relative;
  z-index: 1;
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: center 15%;
  border-radius: 50%;
}

/* Floating badges around avatar */
.avatar-badge {
  position: absolute;
  background: var(--surface-2);
  border: 1px solid var(--border-2);
  border-radius: 100px;
  padding: 0.3rem 0.7rem;
  font-family: var(--mono);
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--text-1);
  white-space: nowrap;
  animation: badge-float 3s ease-in-out infinite;
  backdrop-filter: blur(12px);
}
.avatar-badge .badge-dot {
  display: inline-block;
  width: 6px; height: 6px;
  border-radius: 50%;
  margin-right: 4px;
  vertical-align: middle;
}
.avatar-badge-1 { top: 10%; right: -20%; animation-delay: 0s; }
.avatar-badge-2 { bottom: 15%; left: -25%; animation-delay: 1.5s; }

@keyframes badge-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

/* ── TERMINAL CARD ── */
.terminal-card {
  background: rgba(13, 27, 46, 0.85);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-2);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.terminal-card:hover {
  border-color: rgba(34,211,238,0.25);
  box-shadow: 0 0 40px rgba(34,211,238,0.08);
}

.terminal-header {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  background: rgba(18, 32, 53, 0.8);
  border-bottom: 1px solid var(--border);
}

.dot { width: 11px; height: 11px; border-radius: 50%; }
.dot.red    { background: #ff5f57; }
.dot.yellow { background: #febc2e; }
.dot.green  { background: #28c840; }

.terminal-title {
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--text-3);
  margin-left: auto;
  letter-spacing: 0.05em;
}

.terminal-body {
  padding: 1.1rem 1.3rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  line-height: 1.85;
  color: var(--text-2);
  overflow-x: auto;
}

.terminal-body .kw   { color: var(--cyan); font-weight: 500; }
.terminal-body .val  { color: var(--violet); }
.terminal-body .str  { color: var(--green); }
.terminal-body .cmt  { color: var(--text-3); font-style: italic; }
.terminal-body .num  { color: var(--yellow); }

/* ── MARQUEE SECTION ── */
.marquee-section {
  overflow: hidden;
  padding: 1.5rem 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--bg-2);
  position: relative;
}

.marquee-section::before,
.marquee-section::after {
  content: '';
  position: absolute;
  top: 0; bottom: 0;
  width: 120px;
  z-index: 2;
}
.marquee-section::before { left: 0; background: linear-gradient(90deg, var(--bg-2), transparent); }
.marquee-section::after  { right: 0; background: linear-gradient(-90deg, var(--bg-2), transparent); }

.marquee-row {
  display: flex;
  gap: 0;
  margin-bottom: 0.5rem;
}
.marquee-row:last-child { margin-bottom: 0; }

.marquee-track {
  display: flex;
  gap: 0;
  animation: marquee-fwd 35s linear infinite;
  white-space: nowrap;
}

.marquee-row:nth-child(2) .marquee-track {
  animation: marquee-rev 40s linear infinite;
}

@keyframes marquee-fwd {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}
@keyframes marquee-rev {
  from { transform: translateX(-50%); }
  to   { transform: translateX(0); }
}

.marquee-item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0 1.8rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-3);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: color var(--transition);
  white-space: nowrap;
}

.marquee-item .m-dot {
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--border-2);
}

/* ── SECTION UTILITIES ── */
.section-inner {
  max-width: 1240px;
  margin: 0 auto;
  padding: 6rem 2rem;
}

.section-eyebrow {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--cyan);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.section-eyebrow::before {
  content: '';
  display: inline-block;
  width: 20px; height: 1px;
  background: var(--cyan);
  opacity: 0.6;
}

.section-title {
  font-family: var(--display);
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--text-1);
  margin-bottom: 0.75rem;
  line-height: 1.1;
}

.section-subtitle {
  font-size: 0.95rem;
  color: var(--text-2);
  max-width: 500px;
  line-height: 1.7;
  margin-bottom: 3.5rem;
}

/* Legacy support */
.section-label {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--cyan);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: 2.5rem;
}

/* ── SKILLS SECTION ── */
.skills-section {
  background: var(--bg-2);
  position: relative;
  overflow: hidden;
}

.skills-section::before {
  content: '';
  position: absolute;
  top: -200px; right: -200px;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(167,139,250,0.06) 0%, transparent 65%);
  pointer-events: none;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
}

.skill-card {
  background: rgba(17, 32, 53, 0.7);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
  cursor: default;
}

.skill-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(34,211,238,0.04) 0%, rgba(167,139,250,0.04) 100%);
  opacity: 0;
  transition: opacity var(--transition);
}

.skill-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow:
    0 20px 60px rgba(0,0,0,0.4),
    0 0 0 1px var(--border-hover),
    0 0 30px rgba(34,211,238,0.08);
}

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

.skill-card > * { position: relative; z-index: 1; }

.skill-icon {
  width: 44px; height: 44px;
  border-radius: 12px;
  background: var(--cyan-dim);
  border: 1px solid rgba(34,211,238,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--cyan);
  margin-bottom: 1.3rem;
  transition: all var(--transition);
}

.skill-card:hover .skill-icon {
  background: rgba(34,211,238,0.15);
  box-shadow: 0 0 20px var(--cyan-glow);
}

.skill-icon svg { width: 20px; height: 20px; }

/* Colored variants */
.skill-card:nth-child(2) .skill-icon { background: var(--violet-dim); border-color: rgba(167,139,250,0.2); color: var(--violet); }
.skill-card:nth-child(2):hover .skill-icon { background: rgba(167,139,250,0.2); box-shadow: 0 0 20px var(--violet-glow); }
.skill-card:nth-child(3) .skill-icon { background: var(--green-dim); border-color: rgba(52,211,153,0.2); color: var(--green); }
.skill-card:nth-child(3):hover .skill-icon { background: rgba(52,211,153,0.2); box-shadow: 0 0 20px rgba(52,211,153,0.4); }
.skill-card:nth-child(4) .skill-icon { background: rgba(251,191,36,0.1); border-color: rgba(251,191,36,0.2); color: var(--yellow); }
.skill-card:nth-child(4):hover .skill-icon { background: rgba(251,191,36,0.2); box-shadow: 0 0 20px rgba(251,191,36,0.3); }
.skill-card:nth-child(5) .skill-icon { background: var(--violet-dim); border-color: rgba(167,139,250,0.2); color: var(--violet); }
.skill-card:nth-child(5):hover .skill-icon { background: rgba(167,139,250,0.2); box-shadow: 0 0 20px var(--violet-glow); }
.skill-card:nth-child(6) .skill-icon { background: var(--cyan-dim); border-color: rgba(34,211,238,0.15); color: var(--cyan); }
.skill-card:nth-child(6):hover .skill-icon { background: rgba(34,211,238,0.15); box-shadow: 0 0 20px var(--cyan-glow); }

.skill-card h3 {
  font-family: var(--display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-1);
  margin-bottom: 0.6rem;
}

.skill-card p {
  font-size: 0.83rem;
  color: var(--text-2);
  line-height: 1.65;
  margin-bottom: 1.3rem;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.skill-tags span {
  font-family: var(--mono);
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: rgba(34,211,238,0.08);
  color: var(--cyan);
  border: 1px solid rgba(34,211,238,0.15);
  border-radius: 4px;
  padding: 2px 8px;
}

.skill-card:nth-child(2) .skill-tags span { background: var(--violet-dim); color: var(--violet); border-color: rgba(167,139,250,0.2); }
.skill-card:nth-child(3) .skill-tags span { background: var(--green-dim); color: var(--green); border-color: rgba(52,211,153,0.2); }
.skill-card:nth-child(4) .skill-tags span { background: rgba(251,191,36,0.08); color: var(--yellow); border-color: rgba(251,191,36,0.2); }
.skill-card:nth-child(5) .skill-tags span { background: var(--violet-dim); color: var(--violet); border-color: rgba(167,139,250,0.2); }
.skill-card:nth-child(6) .skill-tags span { background: rgba(34,211,238,0.08); color: var(--cyan); border-color: rgba(34,211,238,0.15); }

/* ── ARTICLES / WRITING SECTION ── */
.articles-teaser { background: var(--bg); position: relative; overflow: hidden; }
.articles-teaser::before {
  content: '';
  position: absolute;
  bottom: -100px; left: -100px;
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(34,211,238,0.05) 0%, transparent 65%);
  pointer-events: none;
}

.articles-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.articles-link-all {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cyan);
  border: 1px solid rgba(34,211,238,0.25);
  padding: 0.45rem 1rem;
  border-radius: var(--radius);
  transition: all var(--transition);
}
.articles-link-all:hover {
  background: var(--cyan-dim);
  box-shadow: 0 0 20px var(--cyan-glow);
}

.articles-teaser-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 1.2rem;
}

.article-teaser-card {
  background: rgba(17, 32, 53, 0.6);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.8rem;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  transition: all var(--transition);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.article-teaser-card::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--violet));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
}

.article-teaser-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0,0,0,0.4), 0 0 30px rgba(34,211,238,0.06);
}
.article-teaser-card:hover::after { transform: scaleX(1); }

.article-cat {
  font-family: var(--mono);
  font-size: 0.62rem;
  color: var(--cyan);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-weight: 600;
}

.article-teaser-card h3 {
  font-family: var(--display);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-1);
  line-height: 1.45;
  flex: 1;
}

.read-more {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--text-3);
  transition: color var(--transition);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.article-teaser-card:hover .read-more { color: var(--cyan); }

/* ── FOOTER ── */
.site-footer {
  background: var(--bg-2);
  border-top: 1px solid var(--border);
}

.footer-inner {
  max-width: 1240px;
  margin: 0 auto;
  padding: 1.8rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.footer-logo {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--text-2);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.footer-copy {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--text-3);
}

.footer-links {
  display: flex;
  gap: 1.2rem;
  align-items: center;
}

.footer-links a {
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--text-3);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: color var(--transition);
}
.footer-links a:hover { color: var(--cyan); }

/* ── PAGE HEADER (inner pages) ── */
.page-header {
  padding: 130px 2rem 4rem;
  position: relative;
  overflow: hidden;
}

.page-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 70% at 80% 50%, rgba(34,211,238,0.06) 0%, transparent 55%),
    radial-gradient(ellipse 50% 60% at 10% 60%, rgba(167,139,250,0.05) 0%, transparent 55%);
  pointer-events: none;
}

.page-header::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(34,211,238,0.05) 1px, transparent 1px);
  background-size: 28px 28px;
  pointer-events: none;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 40%, transparent 100%);
}

.page-header-inner {
  max-width: 1240px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.page-title {
  font-family: var(--display);
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 1rem;
}

.page-title .gt { /* gradient title */
  background: linear-gradient(135deg, var(--cyan), var(--violet));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.page-subtitle {
  font-size: 0.95rem;
  color: var(--text-2);
  max-width: 580px;
  line-height: 1.7;
}

/* ── EXPERTISE PAGE ── */
.expertise-section { background: var(--bg); }
.expertise-section .section-inner { padding-top: 4rem; }

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

.expertise-card {
  background: rgba(17, 32, 53, 0.7);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 2.5rem;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.expertise-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan), transparent);
  transform: scaleX(0);
  transition: transform 0.4s var(--ease);
}

.expertise-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: 0 24px 64px rgba(0,0,0,0.4), 0 0 40px rgba(34,211,238,0.07);
}
.expertise-card:hover::before { transform: scaleX(1); }

.expertise-num {
  font-family: var(--mono);
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--cyan);
  background: var(--cyan-dim);
  border: 1px solid rgba(34,211,238,0.2);
  border-radius: 4px;
  padding: 3px 9px;
  display: inline-block;
  margin-bottom: 1.2rem;
}

.expertise-card h2 {
  font-family: var(--display);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-1);
  margin-bottom: 0.8rem;
}

.expertise-card .block-desc {
  font-size: 0.84rem;
  color: var(--text-2);
  line-height: 1.75;
  margin-bottom: 1.5rem;
}

.expertise-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}

.expertise-list li {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--text-2);
  padding-left: 1.2rem;
  position: relative;
  line-height: 1.5;
}
.expertise-list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--cyan);
}

/* Featured expertise card (full width) */
.expertise-card.featured {
  grid-column: 1 / -1;
}
.expertise-card.featured .expertise-list {
  grid-template-columns: repeat(4, 1fr);
}

/* ── PROJECTS PAGE ── */
.projects-section { background: var(--bg); }
.projects-section .section-inner { padding-top: 3rem; }

.projects-category { margin-bottom: 4rem; }

.category-title {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--cyan);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
  padding-bottom: 0.8rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.category-title::before {
  content: '';
  display: inline-block;
  width: 16px; height: 1px;
  background: var(--cyan);
}

.project-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.8rem;
}

.project-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.4rem 1.5rem;
  background: rgba(17, 32, 53, 0.6);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: all var(--transition);
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.project-item::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--cyan), var(--violet));
  transform: scaleY(0);
  transition: transform 0.3s var(--ease);
}

.project-item:hover {
  border-color: var(--border-hover);
  background: rgba(17, 32, 53, 0.9);
  transform: translateX(4px);
  box-shadow: 0 8px 40px rgba(0,0,0,0.3), 0 0 20px rgba(34,211,238,0.06);
}
.project-item:hover::before { transform: scaleY(1); }

.project-arrow {
  color: var(--cyan);
  font-family: var(--mono);
  font-size: 0.85rem;
  flex-shrink: 0;
  margin-top: 0.15rem;
  transition: transform var(--transition);
}
.project-item:hover .project-arrow { transform: translateX(3px); }

.project-item h3 {
  font-family: var(--display);
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-1);
  margin-bottom: 0.3rem;
  line-height: 1.4;
}

.project-item p {
  font-size: 0.78rem;
  font-family: var(--mono);
  color: var(--text-3);
  line-height: 1.5;
}

/* ── CERTIFICATES PAGE ── */
.certs-section { background: var(--bg); }
.certs-section .section-inner { padding-top: 3rem; }

.cert-hero {
  position: relative;
  background: rgba(17, 32, 53, 0.7);
  border: 1px solid var(--border-2);
  border-radius: var(--radius-xl);
  overflow: hidden;
  margin-bottom: 3rem;
  display: grid;
  grid-template-columns: 380px 1fr;
}

.cert-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 80% at 80% 50%, rgba(34,211,238,0.05) 0%, transparent 60%);
  pointer-events: none;
}

.cert-image-wrapper {
  position: relative;
  overflow: hidden;
  background: var(--bg-3);
}

.cert-image-wrapper img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.6s var(--ease);
}
.cert-hero:hover .cert-image-wrapper img { transform: scale(1.04); }

.cert-hero-info {
  padding: 2.5rem 2.5rem 2.5rem 2.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  z-index: 1;
}

.cert-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--mono);
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--cyan);
  background: var(--cyan-dim);
  border: 1px solid rgba(34,211,238,0.2);
  border-radius: 100px;
  padding: 0.3rem 0.8rem;
  margin-bottom: 1.2rem;
}

.cert-hero-info h2 {
  font-family: var(--display);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-1);
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.cert-hero-info p {
  font-size: 0.85rem;
  color: var(--text-2);
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

.cert-skills-list {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 2rem;
}

.cert-skills-list li {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text-2);
  padding-left: 1.4rem;
  position: relative;
}
.cert-skills-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--green);
}

.cert-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--cyan);
  border: 1px solid rgba(34,211,238,0.3);
  border-radius: var(--radius);
  padding: 0.55rem 1.2rem;
  transition: all var(--transition);
  align-self: flex-start;
}
.cert-link:hover {
  background: var(--cyan-dim);
  border-color: var(--cyan);
  box-shadow: 0 0 20px var(--cyan-glow);
}

.certs-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.2rem;
}

.cert-grid-item {
  background: rgba(17, 32, 53, 0.6);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.8rem;
  display: flex;
  gap: 1.2rem;
  align-items: flex-start;
  transition: all var(--transition);
}
.cert-grid-item:hover {
  border-color: var(--border-hover);
  transform: translateY(-3px);
  box-shadow: 0 16px 48px rgba(0,0,0,0.3), 0 0 24px rgba(34,211,238,0.06);
}

.cert-grid-icon {
  width: 48px; height: 48px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border-2);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1.3rem;
}

.cert-grid-item h3 {
  font-family: var(--display);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-1);
  margin-bottom: 0.4rem;
}

.cert-grid-item p {
  font-size: 0.8rem;
  color: var(--text-2);
  line-height: 1.55;
}

/* ── CONTACT PAGE ── */
.contact-section { background: var(--bg); }
.contact-section .section-inner { padding-top: 3rem; }

.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 4rem;
  align-items: start;
}

.contact-intro {
  margin-bottom: 2.5rem;
}
.contact-intro p {
  font-size: 0.9rem;
  color: var(--text-2);
  line-height: 1.8;
  margin-bottom: 1.2rem;
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--text-2);
  padding: 0.9rem 1.2rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: rgba(17, 32, 53, 0.5);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.contact-link::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--violet));
  transform: scaleY(0);
  transition: transform 0.3s var(--ease);
}
.contact-link:hover {
  color: var(--text-1);
  border-color: var(--border-hover);
  transform: translateX(5px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.3);
}
.contact-link:hover::before { transform: scaleY(1); }

.contact-link-icon {
  width: 36px; height: 36px;
  border-radius: var(--radius);
  background: var(--cyan-dim);
  border: 1px solid rgba(34,211,238,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--cyan);
  font-size: 0.85rem;
  flex-shrink: 0;
  font-style: normal;
  font-weight: 700;
  transition: all var(--transition);
}
.contact-link:hover .contact-link-icon {
  background: rgba(34,211,238,0.2);
  box-shadow: 0 0 16px var(--cyan-glow);
}

/* ── AI CHAT WIDGET ── */
.chat-widget {
  position: fixed;
  bottom: 2.5rem;
  right: 2.5rem;
  z-index: 999;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 1rem;
}

.chat-toggle {
  order: 2;
  width: 58px; height: 58px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--cyan), var(--violet));
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 24px rgba(34,211,238,0.4), 0 0 0 0 rgba(34,211,238,0.3);
  transition: all var(--transition);
  position: relative;
  flex-shrink: 0;
  animation: chat-pulse 3s ease-in-out infinite;
}

@keyframes chat-pulse {
  0%, 100% { box-shadow: 0 4px 24px rgba(34,211,238,0.4), 0 0 0 0 rgba(34,211,238,0.2); }
  50% { box-shadow: 0 4px 24px rgba(34,211,238,0.4), 0 0 0 10px rgba(34,211,238,0); }
}

.chat-toggle:hover {
  transform: scale(1.08);
  box-shadow: 0 8px 40px rgba(34,211,238,0.5);
  animation: none;
}

.chat-toggle svg {
  width: 22px; height: 22px;
  color: #fff;
  transition: opacity 0.2s, transform 0.2s;
  position: absolute;
}

.icon-close { opacity: 0; transform: rotate(-90deg); }
.chat-widget.open .icon-chat { opacity: 0; transform: rotate(90deg); }
.chat-widget.open .icon-close { opacity: 1; transform: rotate(0); }

.chat-badge {
  position: absolute;
  bottom: 115%;
  right: 0;
  background: var(--surface-2);
  border: 1px solid var(--border-2);
  border-radius: 20px;
  padding: 0.35rem 0.9rem;
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--text-2);
  white-space: nowrap;
  transition: opacity 0.3s;
  pointer-events: none;
  backdrop-filter: blur(12px);
}
.chat-widget.open .chat-badge { opacity: 0; }

.chat-panel {
  order: 1;
  width: 370px;
  max-width: calc(100vw - 4rem);
  height: 480px;
  max-height: calc(100vh - 120px);
  background: rgba(13, 27, 46, 0.95);
  backdrop-filter: blur(24px);
  border: 1px solid var(--border-2);
  border-radius: var(--radius-xl);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 24px 80px rgba(0,0,0,0.7), 0 0 0 1px rgba(34,211,238,0.08);
  opacity: 0;
  transform: translateY(12px) scale(0.96);
  pointer-events: none;
  transition: opacity 0.25s var(--ease), transform 0.25s var(--ease);
  transform-origin: bottom right;
}

.chat-widget.open .chat-panel {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: all;
}

.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.2rem;
  border-bottom: 1px solid var(--border);
  background: rgba(17, 32, 53, 0.8);
}

.chat-header-info { display: flex; align-items: center; gap: 0.75rem; }

.chat-avatar {
  width: 38px; height: 38px;
  background: linear-gradient(135deg, var(--cyan), var(--violet));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 700;
  color: #fff;
}

.chat-name {
  font-family: var(--display);
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-1);
}
.chat-status {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--green);
}
.status-dot {
  width: 6px; height: 6px;
  background: var(--green);
  border-radius: 50%;
  animation: pulse-green 2.5s ease-in-out infinite;
  box-shadow: 0 0 6px var(--green);
}

.chat-close-btn {
  width: 30px; height: 30px;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-3);
  transition: all var(--transition);
}
.chat-close-btn:hover { color: var(--text-1); border-color: var(--border-2); background: var(--surface); }
.chat-close-btn svg { width: 14px; height: 14px; }

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  scrollbar-width: thin;
  scrollbar-color: var(--surface-2) transparent;
}

.chat-msg {
  max-width: 85%;
  font-family: var(--mono);
  font-size: 0.8rem;
  line-height: 1.6;
}

.chat-msg.assistant {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px var(--radius-lg) var(--radius-lg) var(--radius-lg);
  padding: 0.75rem 1rem;
  color: var(--text-1);
  align-self: flex-start;
}

.chat-msg.user {
  background: linear-gradient(135deg, rgba(34,211,238,0.2), rgba(167,139,250,0.2));
  border: 1px solid rgba(34,211,238,0.2);
  border-radius: var(--radius-lg) 4px var(--radius-lg) var(--radius-lg);
  padding: 0.75rem 1rem;
  color: var(--text-1);
  align-self: flex-end;
}

.chat-msg p { margin: 0; }

.chat-suggestions {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-top: 0.4rem;
}

.suggestion-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.45rem 0.8rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--text-2);
  cursor: pointer;
  text-align: left;
  transition: all var(--transition);
}
.suggestion-btn:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  background: var(--cyan-dim);
}

.typing-indicator {
  display: flex;
  gap: 4px;
  align-items: center;
  padding: 0.75rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px var(--radius-lg) var(--radius-lg) var(--radius-lg);
  align-self: flex-start;
}

.typing-dot {
  width: 6px; height: 6px;
  background: var(--text-3);
  border-radius: 50%;
  animation: typing 1.2s infinite;
}
.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes typing {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.35; }
  30% { transform: translateY(-5px); opacity: 1; }
}

.chat-input-area {
  display: flex;
  gap: 0.5rem;
  padding: 0.75rem;
  border-top: 1px solid var(--border);
  background: rgba(17, 32, 53, 0.6);
}

#chatInput {
  flex: 1;
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.6rem 0.9rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text-1);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}
#chatInput::placeholder { color: var(--text-3); }
#chatInput:focus { border-color: var(--cyan); box-shadow: 0 0 0 3px rgba(34,211,238,0.08); }

#chatSend {
  width: 38px; height: 38px;
  background: linear-gradient(135deg, var(--cyan), var(--violet));
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  flex-shrink: 0;
}
#chatSend:hover { transform: scale(1.08); box-shadow: 0 0 16px var(--cyan-glow); }
#chatSend svg { width: 15px; height: 15px; color: #fff; }

/* ── RESPONSIVE ── */
@media (max-width: 1100px) {
  .hero-inner { grid-template-columns: 1fr 280px; gap: 3rem; }
  .skills-grid { grid-template-columns: repeat(2, 1fr); }
  .articles-teaser-grid { grid-template-columns: 1fr 1fr 1fr; }
  .expertise-grid { grid-template-columns: 1fr; }
  .expertise-card.featured .expertise-list { grid-template-columns: repeat(2, 1fr); }
  .project-list { grid-template-columns: 1fr; }
  .cert-hero { grid-template-columns: 300px 1fr; }
  .contact-layout { grid-template-columns: 1fr; gap: 2.5rem; }
}

@media (max-width: 900px) {
  .cert-hero { grid-template-columns: 1fr; }
  .cert-image-wrapper { aspect-ratio: 16/8; }
  .cert-hero-info { padding: 2rem; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-cta { display: none; }
  .nav-toggle { display: flex; }

  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 68px; left: 0; right: 0;
    background: rgba(7, 16, 32, 0.97);
    backdrop-filter: blur(24px);
    border-bottom: 1px solid var(--border-2);
    padding: 1.2rem 1.5rem;
    gap: 0.3rem;
  }

  .nav-links.open .nav-link {
    padding: 0.7rem 1rem;
    font-size: 0.82rem;
  }

  .hero-inner { grid-template-columns: 1fr; }
  .hero-visual { display: none; }
  .hero-stats { flex-wrap: wrap; gap: 1.5rem; }
  .stat-divider { display: none; }
  .hero { padding-bottom: 4rem; }

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

  .expertise-grid { grid-template-columns: 1fr; }
  .expertise-card.featured .expertise-list { grid-template-columns: 1fr 1fr; }
  .expertise-list { grid-template-columns: 1fr; }

  .project-list { grid-template-columns: 1fr; }
  .certs-grid { grid-template-columns: 1fr; }
  .contact-layout { grid-template-columns: 1fr; }

  .chat-panel { width: calc(100vw - 2rem); }
  .chat-widget { right: 1rem; bottom: 1rem; }

  .page-title { font-size: clamp(2rem, 8vw, 3.2rem); }
}

@media (max-width: 480px) {
  .nav-inner { padding: 0 1rem; }
  .hero { padding: 90px 1rem 3rem; }
  .section-inner { padding: 4rem 1rem; }
  .hero-title { font-size: clamp(2.4rem, 10vw, 3.5rem); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
  .reveal, .reveal-left { opacity: 1; transform: none; }
}