/* ===== DESIGN TOKENS ===== */
:root {
  /* Type Scale */
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);
  --text-hero: clamp(3rem,     0.5rem  + 7vw,    8rem);

  /* Spacing */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;
  --content-full: 100%;

  /* Fonts */
  --font-display: 'Clash Display', 'Arial Black', sans-serif;
  --font-body: 'Satoshi', 'Inter', sans-serif;
}

/* ===== DARK THEME (DEFAULT — user chose dark & modern) ===== */
:root, [data-theme="dark"] {
  --color-bg:             #0a0a0f;
  --color-surface:        #111118;
  --color-surface-2:      #16161f;
  --color-surface-offset: #1a1a25;
  --color-surface-dynamic: #22222e;
  --color-divider:        #2a2a38;
  --color-border:         #333345;
  --color-text:           #e0e0e8;
  --color-text-muted:     #8888a0;
  --color-text-faint:     #555570;
  --color-text-inverse:   #0a0a0f;
  --color-primary:        #00d4aa;
  --color-primary-hover:  #00f0c0;
  --color-primary-active: #00b892;
  --color-primary-highlight: rgba(0, 212, 170, 0.1);
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.5);
}

/* ===== LIGHT THEME ===== */
[data-theme="light"] {
  --color-bg:             #f5f5f8;
  --color-surface:        #ffffff;
  --color-surface-2:      #fafafc;
  --color-surface-offset: #eeeef2;
  --color-surface-dynamic: #e4e4ea;
  --color-divider:        #d4d4dc;
  --color-border:         #c4c4d0;
  --color-text:           #1a1a2e;
  --color-text-muted:     #6a6a80;
  --color-text-faint:     #9a9ab0;
  --color-text-inverse:   #f5f5f8;
  --color-primary:        #008868;
  --color-primary-hover:  #006a50;
  --color-primary-active: #005540;
  --color-primary-highlight: rgba(0, 136, 104, 0.08);
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.12);
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme]) {
    --color-bg:             #f5f5f8;
    --color-surface:        #ffffff;
    --color-surface-2:      #fafafc;
    --color-surface-offset: #eeeef2;
    --color-surface-dynamic: #e4e4ea;
    --color-divider:        #d4d4dc;
    --color-border:         #c4c4d0;
    --color-text:           #1a1a2e;
    --color-text-muted:     #6a6a80;
    --color-text-faint:     #9a9ab0;
    --color-text-inverse:   #f5f5f8;
    --color-primary:        #008868;
    --color-primary-hover:  #006a50;
    --color-primary-active: #005540;
    --color-primary-highlight: rgba(0, 136, 104, 0.08);
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 12px 32px rgba(0,0,0,0.12);
  }
}

/* ===== GLOBAL STYLES ===== */
a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-interactive);
}
a:hover { color: var(--color-primary-hover); }

.container {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

/* ===== HEADER / NAV ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: oklch(from var(--color-bg) l c h / 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid oklch(from var(--color-text) l c h / 0.06);
  transition: transform 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out);
}
.header--hidden { transform: translateY(-100%); }
.header--scrolled { box-shadow: var(--shadow-sm); }

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-6);
  max-width: var(--content-wide);
  margin-inline: auto;
}

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-lg);
  color: var(--color-text);
  text-decoration: none;
}
.header__logo:hover { color: var(--color-primary); }

.header__nav { display: flex; align-items: center; gap: var(--space-6); }

.header__nav a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: color var(--transition-interactive);
}
.header__nav a:hover { color: var(--color-text); }

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  transition: color var(--transition-interactive), background var(--transition-interactive);
}
.theme-toggle:hover {
  color: var(--color-text);
  background: var(--color-primary-highlight);
}

.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  color: var(--color-text);
}
.mobile-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform 0.3s var(--ease-out), opacity 0.3s var(--ease-out);
}

.mobile-nav {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 99;
  background: var(--color-bg);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-8);
}
.mobile-nav.active { display: flex; }
.mobile-nav a {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
}
.mobile-nav a:hover { color: var(--color-primary); }

@media (max-width: 768px) {
  .header__nav { display: none; }
  .mobile-toggle { display: flex; }
}

/* ===== HERO ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-top: var(--space-16);
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.35;
}
.hero__bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    oklch(from var(--color-bg) l c h / 0.3) 0%,
    oklch(from var(--color-bg) l c h / 0.6) 40%,
    var(--color-bg) 100%
  );
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding: var(--space-16) var(--space-6);
}

.hero__label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-6);
}
.hero__label::before {
  content: '';
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-primary);
}

.hero__title {
  font-family: var(--font-display);
  font-size: var(--text-hero);
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.05;
  margin-bottom: var(--space-6);
  max-width: 14ch;
}

.hero__subtitle {
  font-size: var(--text-xl);
  color: var(--color-text-muted);
  font-weight: 400;
  line-height: 1.4;
  max-width: 40ch;
  margin-bottom: var(--space-8);
}

.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-6);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: background var(--transition-interactive), transform var(--transition-interactive), box-shadow var(--transition-interactive);
}
.hero__cta:hover {
  background: var(--color-primary-hover);
  color: var(--color-text-inverse);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
.hero__cta:active { transform: translateY(0); }

.hero__stats {
  display: flex;
  gap: var(--space-10);
  margin-top: var(--space-12);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-divider);
}
.hero__stat-value {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
}
.hero__stat-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

@media (max-width: 768px) {
  .hero__stats { flex-wrap: wrap; gap: var(--space-6); }
}

/* ===== SECTIONS ===== */
.section {
  padding-block: clamp(var(--space-12), 8vw, var(--space-24));
}

.section__label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}
.section__label::before {
  content: '';
  display: block;
  width: 16px;
  height: 2px;
  background: var(--color-primary);
}

.section__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.section__desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 60ch;
  margin-bottom: var(--space-10);
}

/* ===== ABOUT ===== */
.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: center;
}
.about__text p {
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  font-size: var(--text-base);
  line-height: 1.7;
}
.about__image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
}
.about__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 4/3;
}
.about__image::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  border: 1px solid oklch(from var(--color-primary) l c h / 0.15);
}

@media (max-width: 768px) {
  .about__grid { grid-template-columns: 1fr; gap: var(--space-8); }
}

/* ===== EXPERTISE ===== */
.expertise__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(320px, 100%), 1fr));
  gap: var(--space-6);
}
.expertise__card {
  padding: var(--space-8);
  background: var(--color-surface);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition-interactive), box-shadow var(--transition-interactive);
}
.expertise__card:hover {
  border-color: oklch(from var(--color-primary) l c h / 0.3);
  box-shadow: var(--shadow-md);
}
.expertise__card-icon {
  width: 40px;
  height: 40px;
  color: var(--color-primary);
  margin-bottom: var(--space-5);
}
.expertise__card h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}
.expertise__card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ===== PILLARS / SERVICES GRID ===== */
.pillars-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

.pillar-card {
  position: relative;
  padding: var(--space-8);
  background: var(--color-surface-2);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition-interactive), box-shadow var(--transition-interactive), transform var(--transition-interactive);
  overflow: hidden;
}
.pillar-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), transparent);
  opacity: 0;
  transition: opacity var(--transition-interactive);
}
.pillar-card:hover {
  border-color: oklch(from var(--color-primary) l c h / 0.3);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.pillar-card:hover::before {
  opacity: 1;
}

.pillar-card__number {
  font-family: var(--font-display);
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.1em;
  margin-bottom: var(--space-4);
  opacity: 0.6;
}

.pillar-card__icon {
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}

.pillar-card__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.pillar-card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: var(--space-5);
}

.pillar-card__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.pillar-card__list li {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding: var(--space-1) 0;
}
.pillar-card__list li i,
.pillar-card__list li svg {
  color: var(--color-primary);
  flex-shrink: 0;
  opacity: 0.7;
}

@media (max-width: 768px) {
  .pillars-grid {
    grid-template-columns: 1fr;
  }
}

/* ===== EXPERIENCE ===== */
.experience__timeline {
  position: relative;
  padding-left: var(--space-8);
}
.experience__timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: var(--space-2);
  bottom: var(--space-2);
  width: 1px;
  background: linear-gradient(180deg, var(--color-primary), var(--color-divider));
}

.experience__item {
  position: relative;
  padding-bottom: var(--space-10);
}
.experience__item:last-child { padding-bottom: 0; }

.experience__item::before {
  content: '';
  position: absolute;
  left: calc(-1 * var(--space-8) - 4px);
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  box-shadow: 0 0 0 4px var(--color-bg);
}

.experience__company {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}
.experience__role {
  font-size: var(--text-sm);
  color: var(--color-primary);
  font-weight: 500;
  margin-bottom: var(--space-2);
}
.experience__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}
.experience__highlights {
  list-style: none;
  padding: 0;
  margin-top: var(--space-3);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}
.experience__highlights li {
  font-size: var(--text-xs);
  color: var(--color-primary);
  background: var(--color-primary-highlight);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-weight: 500;
}

/* ===== IMPACT (Full-bleed) ===== */
.impact {
  position: relative;
  overflow: hidden;
  background: var(--color-surface);
}
.impact__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.impact__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.12;
}
.impact__content {
  position: relative;
  z-index: 1;
}
.impact__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(220px, 100%), 1fr));
  gap: var(--space-6);
}
.impact__card {
  text-align: center;
  padding: var(--space-8) var(--space-4);
}
.impact__value {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: var(--space-2);
}
.impact__label {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* ===== SKILLS ===== */
.skills__grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}
.skill-tag {
  font-size: var(--text-sm);
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid oklch(from var(--color-text) l c h / 0.1);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  transition: border-color var(--transition-interactive), background var(--transition-interactive);
}
.skill-tag:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-highlight);
}

/* ===== CERTIFICATIONS ===== */
.certs__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(280px, 100%), 1fr));
  gap: var(--space-6);
}
.cert__card {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  border-radius: var(--radius-lg);
}
.cert__icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
}
.cert__info h3 {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}
.cert__info p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* ===== CONTACT ===== */
.contact__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: start;
}
.contact__text h2 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}
.contact__text p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
}
.contact__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
.contact__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-base);
  color: var(--color-text);
  text-decoration: none;
  transition: color var(--transition-interactive);
}
.contact__link:hover { color: var(--color-primary); }
.contact__link svg { width: 20px; height: 20px; color: var(--color-primary); flex-shrink: 0; }

.contact__form {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
.contact__form input,
.contact__form textarea {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border: 1px solid oklch(from var(--color-text) l c h / 0.1);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  color: var(--color-text);
  transition: border-color var(--transition-interactive);
}
.contact__form input:focus,
.contact__form textarea:focus {
  border-color: var(--color-primary);
  outline: none;
}
.contact__form textarea { min-height: 120px; resize: vertical; }
.contact__form button {
  align-self: flex-start;
  padding: var(--space-3) var(--space-8);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  font-weight: 600;
  font-size: var(--text-sm);
  border-radius: var(--radius-md);
  transition: background var(--transition-interactive), transform var(--transition-interactive);
}
.contact__form button:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
}

@media (max-width: 768px) {
  .contact__inner { grid-template-columns: 1fr; }
}

/* ===== SKILLS-CERTS GRID ===== */
.skills-certs-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
}
@media (max-width: 768px) {
  .skills-certs-grid { grid-template-columns: 1fr; }
}

/* ===== FOOTER ===== */
.footer {
  padding: var(--space-8) var(--space-6);
  border-top: 1px solid var(--color-divider);
  text-align: center;
}
.footer__inner {
  max-width: var(--content-wide);
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
}
.footer p {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}
.footer a {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-decoration: none;
  transition: color var(--transition-interactive);
}
.footer a:hover { color: var(--color-primary); }

/* ===== SCROLL ANIMATIONS ===== */
.fade-in { opacity: 1; }

@supports (animation-timeline: scroll()) {
  .fade-in {
    opacity: 0;
    animation: reveal-fade linear both;
    animation-timeline: view();
    animation-range: entry 0% entry 100%;
  }
}

@keyframes reveal-fade {
  to { opacity: 1; }
}