/* ═══════════════════════════════════════════════════════════
   SECTIONS.CSS — About, Skills, Projects, Experience, Contact
═══════════════════════════════════════════════════════════ */

/* ══════════════════
   MARQUEE
══════════════════ */
.marquee {
  background: var(--navy-deep);
  padding: 13px 0;
  overflow: hidden;
  white-space: nowrap;
}
.marquee-track {
  display: inline-flex;
  animation: march 30s linear infinite;
}
.marquee:hover .marquee-track {
  animation-play-state: paused;
}
.marquee-item {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.35);
  padding: 0 28px;
  display: inline-flex;
  align-items: center;
  gap: 18px;
}
.marquee-item::after {
  content: '◆';
  font-size: 5px;
  color: rgba(255, 255, 255, 0.15);
}
@keyframes march {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}

/* ══════════════════
   ABOUT
══════════════════ */
.about-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}
.about-h2 {
  font-family: var(--font-serif);
  font-size: clamp(36px, 4vw, 54px);
  font-weight: 300;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin-bottom: 22px;
}
.about-h2 em {
  font-style: italic;
  color: var(--accent);
}
.about-body {
  font-size: 14px;
  font-weight: 300;
  line-height: 1.9;
  color: var(--ink-60);
  margin-bottom: 34px;
}
.about-facts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-top: 1px solid var(--rule);
}
.fact {
  padding: 15px 0;
  border-bottom: 1px solid var(--rule);
}
.fact:nth-child(even) {
  padding-left: 22px;
  border-left: 1px solid var(--rule);
}
.fact-l {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.20em;
  text-transform: uppercase;
  color: var(--ink-25);
  margin-bottom: 4px;
}
.fact-v {
  font-size: 13px;
  font-weight: 400;
  color: var(--ink);
}

/* About right panel */
.about-right {
  background: var(--navy-deep);
  padding: 44px;
  display: flex;
  flex-direction: column;
  gap: 22px;
}
.about-quote {
  font-family: var(--font-serif);
  font-size: 21px;
  font-weight: 300;
  font-style: italic;
  color: rgba(237, 238, 242, 0.62);
  line-height: 1.55;
  border-left: 2px solid var(--accent);
  padding-left: 18px;
}
.about-quote-attr {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.20em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.22);
}
.stack-label {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.20em;
  text-transform: uppercase;
  color: rgba(42, 95, 144, 0.70);
  margin-bottom: 11px;
  padding-top: 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}
.tg-dark {
  font-size: 11px;
  font-weight: 300;
  color: rgba(237, 238, 242, 0.40);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.07);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
}

/* ══════════════════
   AI SECTION
══════════════════ */
.ai-section {
  background: var(--navy-deep);
  position: relative;
  overflow: hidden;
}
.ai-section-inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--section-y) var(--section-x);
  position: relative;
  z-index: 1;
}
/* Ambient animated background */
.ai-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(99, 102, 241, 0.15) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 20%, rgba(6, 182, 212, 0.10) 0%, transparent 50%);
  animation: aiAmbient 8s ease-in-out infinite alternate;
}
@keyframes aiAmbient {
  from { opacity: 0.6; transform: scale(1); }
  to   { opacity: 1;   transform: scale(1.05); }
}

.ai-eyebrow-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.20em;
  text-transform: uppercase;
  background: var(--ai-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.ai-eyebrow-rule {
  flex: 1;
  height: 1px;
  background: rgba(255, 255, 255, 0.08);
}

.ai-section-h2 {
  font-family: var(--font-serif);
  font-size: clamp(36px, 4vw, 54px);
  font-weight: 300;
  line-height: 1.1;
  color: rgba(237, 238, 242, 0.90);
  margin-bottom: 14px;
}
.ai-section-h2 em {
  font-style: italic;
  background: var(--ai-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.ai-section-sub {
  font-size: 14px;
  font-weight: 300;
  color: rgba(255, 255, 255, 0.35);
  max-width: 480px;
  margin-bottom: 48px;
  line-height: 1.8;
}

/* AI Chat interface */
.ai-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 2px;
}

.ai-chat-wrap {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: grid;
  grid-template-rows: auto 1fr auto;
  height: 520px;
}
.ai-chat-header {
  padding: 16px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(255, 255, 255, 0.02);
}
.ai-chat-header-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--ai-gradient);
  animation: gradShift 3s ease-in-out infinite alternate;
}
.ai-chat-header-title {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.45);
}
.ai-chat-header-status {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.12em;
  color: rgba(74, 158, 106, 0.7);
  display: flex;
  align-items: center;
  gap: 5px;
}
.ai-chat-header-status::before {
  content: '';
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--green);
  animation: pulse-green 2s infinite;
}

/* Messages */
.ai-chat-messages {
  padding: 24px 20px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.08) transparent;
}
.ai-chat-messages::-webkit-scrollbar { width: 3px; }
.ai-chat-messages::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.08);
  border-radius: 2px;
}

.chat-msg {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  animation: msgIn 0.3s var(--ease-out) forwards;
}
@keyframes msgIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: none; }
}

.chat-msg.user {
  flex-direction: row-reverse;
}

.chat-avatar {
  width: 28px; height: 28px;
  border-radius: 50%;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 600;
}
.chat-avatar.ai-avatar {
  background: var(--ai-gradient);
  background-size: 200% 200%;
  animation: gradShift 4s ease-in-out infinite alternate;
  color: white;
}
.chat-avatar.user-avatar {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.12);
  color: rgba(255,255,255,0.5);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.1em;
}

.chat-bubble {
  max-width: 78%;
  padding: 12px 16px;
  font-size: 13px;
  font-weight: 300;
  line-height: 1.7;
  border-radius: var(--radius-md);
}
.chat-bubble.ai-bubble {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: rgba(237, 238, 242, 0.80);
}
.chat-bubble.user-bubble {
  background: rgba(42, 95, 144, 0.25);
  border: 1px solid rgba(42, 95, 144, 0.3);
  color: rgba(237, 238, 242, 0.85);
}

/* Typing indicator */
.typing-indicator {
  display: flex;
  gap: 4px;
  align-items: center;
  padding: 10px 14px;
}
.typing-dot {
  width: 5px; height: 5px;
  border-radius: 50%;
  background: rgba(99, 102, 241, 0.6);
  animation: typingBounce 1.2s ease-in-out infinite;
}
.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }
@keyframes typingBounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
  30%            { transform: translateY(-6px); opacity: 1; }
}

/* Chat input */
.ai-chat-input-wrap {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 12px 16px;
  display: flex;
  gap: 10px;
  align-items: center;
  background: rgba(255, 255, 255, 0.02);
}
.ai-chat-input {
  flex: 1;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 300;
  color: rgba(237, 238, 242, 0.85);
  outline: none;
  transition: border-color 0.2s;
}
.ai-chat-input::placeholder {
  color: rgba(255, 255, 255, 0.20);
}
.ai-chat-input:focus {
  border-color: rgba(99, 102, 241, 0.4);
}
.ai-chat-send {
  width: 36px; height: 36px;
  border-radius: var(--radius-sm);
  background: var(--ai-gradient);
  background-size: 200% 200%;
  animation: gradShift 4s ease-in-out infinite alternate;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 14px;
  cursor: pointer;
  transition: transform 0.2s, opacity 0.2s;
  flex-shrink: 0;
}
.ai-chat-send:hover {
  transform: scale(1.08);
}
.ai-chat-send:disabled {
  opacity: 0.4;
  transform: none;
}

/* Quick prompt chips */
.ai-quick-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 0 20px 14px;
}
.ai-quick-chip {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 5px 12px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-full);
  color: rgba(255,255,255,0.35);
  cursor: pointer;
  transition: all 0.18s;
}
.ai-quick-chip:hover {
  background: rgba(99, 102, 241, 0.12);
  border-color: rgba(99, 102, 241, 0.3);
  color: rgba(255,255,255,0.70);
}

/* Side panel — AI tools used */
.ai-tools-panel {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: var(--radius-md);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  height: 520px;
}
.ai-tools-title {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.30);
  margin-bottom: 4px;
}
.ai-tool-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding-bottom: 18px;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}
.ai-tool-item:last-child { border-bottom: none; padding-bottom: 0; }
.ai-tool-icon {
  width: 36px; height: 36px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.07);
}
.ai-tool-name {
  font-size: 13px;
  font-weight: 400;
  color: rgba(237,238,242,0.70);
  margin-bottom: 3px;
}
.ai-tool-desc {
  font-size: 11px;
  font-weight: 300;
  color: rgba(255,255,255,0.25);
  line-height: 1.6;
}

/* ══════════════════
   SKILLS
══════════════════ */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  overflow: hidden;
}
.skill-block {
  background: var(--white);
  padding: 32px 28px;
  transition: background var(--duration-fast);
}
.skill-block:hover {
  background: var(--warm);
}
.skill-cat {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.20em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}
.skill-title {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 300;
  color: var(--ink);
  margin-bottom: 16px;
}

/* ══════════════════
   PROJECTS
══════════════════ */
.proj-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
}
.proj-grid .proj-card:first-child {
  grid-column: span 2;
}
.proj-card {
  background: var(--white);
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
  position: relative;
  overflow: hidden;
  transition:
    box-shadow var(--duration-slow),
    transform var(--duration-base);
  cursor: pointer;
}
body.custom-cursor .proj-card { cursor: none; }
.proj-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}
.proj-bar { height: 3px; width: 100%; }
.proj-bar-1 { background: var(--navy); }
.proj-bar-2 { background: var(--accent); }
.proj-bar-3 { background: var(--navy-mid); }
.proj-bar-4 { background: #4a6a8a; }
.proj-bar-5 { background: #6a8aaa; }
.proj-bar-6 { background: #8aaabb; }
.proj-bar-ai {
  background: var(--ai-gradient);
  background-size: 200% 100%;
  animation: gradShift 3s ease-in-out infinite alternate;
}

.proj-body {
  padding: 36px 32px;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.proj-card:first-child .proj-body {
  padding: 44px 40px;
}

.proj-idx {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.16em;
  color: var(--ink-25);
  margin-bottom: 14px;
}
.proj-title-text {
  font-family: var(--font-serif);
  font-size: clamp(20px, 2vw, 30px);
  font-weight: 300;
  line-height: 1.1;
  color: var(--ink);
  margin-bottom: 12px;
}
.proj-title-text em {
  font-style: italic;
  color: var(--accent);
}
.proj-title-text .ai-gradient-text {
  background: var(--ai-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-style: italic;
}
.proj-desc-text {
  font-size: 13px;
  font-weight: 300;
  line-height: 1.8;
  color: var(--ink-60);
  flex: 1;
  margin-bottom: 20px;
}
.proj-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 20px;
}
.proj-badge {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  background: var(--warm);
  border: 1px solid var(--rule);
  padding: 3px 9px;
  color: var(--ink-60);
}
.proj-badge-ai {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  background: var(--ai-gradient-soft);
  border: 1px solid rgba(99, 102, 241, 0.2);
  padding: 3px 9px;
  color: var(--ai-1);
}

.proj-link-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--navy);
  display: flex;
  align-items: center;
  gap: 7px;
  margin-top: auto;
  transition: color 0.2s, gap 0.2s;
}
.proj-link-label::after { content: '→'; transition: transform 0.2s; }
.proj-card:hover .proj-link-label {
  color: var(--accent);
  gap: 13px;
}

/* ══════════════════
   EXPERIENCE
══════════════════ */
.exp-list {
  border: 1px solid var(--rule);
  overflow: hidden;
  background: var(--white);
}
.exp-row {
  border-bottom: 1px solid var(--rule);
  transition: background var(--duration-fast);
}
.exp-row:last-child { border-bottom: none; }
.exp-row.open { background: var(--warm); }

.exp-header {
  display: grid;
  grid-template-columns: 200px 1fr auto;
  align-items: center;
  cursor: pointer;
  transition: background var(--duration-fast);
  user-select: none;
}
.exp-header:hover { background: rgba(24, 24, 24, 0.03); }
.exp-row.open .exp-header { background: var(--warm); }

.exp-period {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--ink-25);
  padding: 26px 30px;
  border-right: 1px solid var(--rule);
  white-space: nowrap;
  align-self: stretch;
  display: flex;
  align-items: center;
}
.exp-header-main { padding: 26px 36px; }
.exp-role-text {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin-bottom: 2px;
}
.exp-co-text {
  font-family: var(--font-serif);
  font-size: 15px;
  font-style: italic;
  color: var(--ink-60);
}

.exp-header-right {
  padding: 26px 28px;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.exp-pill {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--accent-line);
  background: var(--accent-dim);
  padding: 4px 12px;
  white-space: nowrap;
}
.exp-toggle {
  width: 26px; height: 26px;
  border-radius: 50%;
  border: 1px solid var(--rule);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition:
    border-color var(--duration-base),
    background var(--duration-base),
    transform 0.35s;
  font-size: 14px;
  font-weight: 300;
  color: var(--ink-25);
  line-height: 1;
}
.exp-row.open .exp-toggle {
  background: var(--navy);
  border-color: var(--navy);
  color: var(--white);
  transform: rotate(45deg);
}

/* Accordion detail */
.exp-detail {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.38s var(--ease-out);
}
.exp-row.open .exp-detail {
  grid-template-rows: 1fr;
  border-top: 1px solid var(--rule);
}
.exp-detail-inner {
  overflow: hidden;
  padding: 0;
  transition: padding 0.38s var(--ease-out);
}
.exp-row.open .exp-detail-inner {
  padding: 24px 36px 28px calc(200px + 30px + 36px);
}

.exp-bullets {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 16px;
}
.exp-bullet {
  font-size: 13px;
  font-weight: 300;
  line-height: 1.75;
  color: var(--ink-60);
  padding-left: 16px;
  position: relative;
}
.exp-bullet::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 10px;
  top: 2px;
}
.exp-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}
.exp-chip {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-25);
  border: 1px solid var(--rule);
  padding: 3px 9px;
}

/* ══════════════════
   CERTIFICATIONS
══════════════════ */
.cert-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
}
.cert-card {
  background: var(--white);
  padding: 32px 30px;
  display: flex;
  flex-direction: column;
  gap: 9px;
  border: 1px solid var(--rule);
  transition: background var(--duration-fast);
}
.cert-card:hover { background: var(--warm); }
.cert-issuer {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
}
.cert-name {
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 400;
  color: var(--ink);
  line-height: 1.3;
}
.cert-code {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-25);
}

/* ══════════════════
   CONTACT
══════════════════ */
.contact-wrap {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--section-y) var(--section-x);
}
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--rule);
  overflow: hidden;
}
.contact-left {
  padding: 64px;
  background: var(--navy-deep);
}
.contact-h2 {
  font-family: var(--font-serif);
  font-size: clamp(36px, 4vw, 54px);
  font-weight: 300;
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: #ebebf0;
  margin-bottom: 18px;
}
.contact-h2 em {
  font-style: italic;
  color: rgba(255, 255, 255, 0.45);
}
.contact-sub {
  font-size: 13.5px;
  font-weight: 300;
  color: rgba(255, 255, 255, 0.40);
  line-height: 1.85;
  max-width: 320px;
  margin-bottom: 32px;
}
.contact-right {
  padding: 64px;
  background: var(--white);
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0;
}
.contact-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 0;
  border-bottom: 1px solid var(--rule);
  text-decoration: none;
  color: inherit;
  transition: color 0.15s;
}
.contact-row:last-child { border-bottom: none; padding-bottom: 0; }
.contact-row:hover { color: var(--accent); }
.contact-row-label {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-25);
  margin-bottom: 3px;
}
.contact-row-value {
  font-size: 13px;
  font-weight: 500;
  color: var(--ink);
  transition: color 0.15s;
}
.contact-row:hover .contact-row-value { color: var(--accent); }
.contact-arrow {
  font-size: 15px;
  color: var(--ink-25);
  transition: color 0.15s, transform 0.2s;
}
.contact-row:hover .contact-arrow {
  color: var(--accent);
  transform: translate(3px, -3px);
}

/* ══════════════════
   FOOTER
══════════════════ */
footer {
  max-width: 100%;
  padding: 22px var(--section-x);
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--rule);
  background: var(--paper);
}
.footer-text {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-25);
}

/* ══════════════════
   RESPONSIVE
══════════════════ */
@media (max-width: 1024px) {
  .about-inner { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: 1fr 1fr; }
  .proj-grid {
    grid-template-columns: 1fr 1fr;
  }
  .proj-grid .proj-card:first-child { grid-column: span 2; }
  .contact-grid { grid-template-columns: 1fr; }
  .contact-left, .contact-right { padding: 44px 32px; }
  .exp-header { grid-template-columns: 1fr auto; }
  .exp-period { display: none; }
  .exp-header-main { padding: 20px; }
  .exp-header-right { padding: 20px 16px; }
  .exp-detail-inner,
  .exp-row.open .exp-detail-inner { padding: 0 20px 20px; }
  footer {
    padding: 20px 32px;
    flex-direction: column;
    gap: 6px;
    text-align: center;
  }
  .ai-chat-wrap {
    height: auto;
    min-height: 400px;
  }
  .ai-layout { grid-template-columns: 1fr; }
  .ai-tools-panel { height: auto; }
}

@media (max-width: 640px) {
  .skills-grid,
  .cert-grid { grid-template-columns: 1fr; }
  .proj-grid { grid-template-columns: 1fr; }
  .proj-grid .proj-card:first-child { grid-column: span 1; }
}