/* ================================================
   main.css — Brints Overview
   Design tokens, typography, layout utilities,
   section-level styles
   ================================================ */

/* ──────────────────────────────────────────────
   1. DESIGN TOKENS
   Derived from SpokenAI's CSS for brand consistency
   ────────────────────────────────────────────── */
:root {
  /* Colours */
  --c-bg:              #0a0a0b;
  --c-surface:         #141416;
  --c-surface-hover:   #1e1e21;
  --c-border:          #27272a;
  --c-border-focus:    #3b82f6;

  --c-text-primary:    #f8fafc;
  --c-text-secondary:  #94a3b8;
  --c-text-muted:      #64748b;

  --c-accent:          #3b82f6;
  --c-accent-hover:    #2563eb;
  --c-accent-soft:     rgba(59, 130, 246, 0.10);
  --c-accent-glow:     rgba(59, 130, 246, 0.25);

  /* Badges */
  --c-badge-web:       rgba(59, 130, 246, 0.15);
  --c-badge-web-text:  #93c5fd;
  --c-badge-desktop:   rgba(139, 92, 246, 0.15);
  --c-badge-desktop-text: #c4b5fd;
  --c-badge-edu:       rgba(16, 185, 129, 0.15);
  --c-badge-edu-text:  #6ee7b7;

  /* Typography */
  --font-heading: 'Poppins', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body:    'Roboto', -apple-system, BlinkMacSystemFont, sans-serif;

  --fs-xs:   0.75rem;    /* 12px */
  --fs-sm:   0.875rem;   /* 14px */
  --fs-base: 1rem;       /* 16px */
  --fs-lg:   1.125rem;   /* 18px */
  --fs-xl:   1.25rem;    /* 20px */
  --fs-2xl:  1.5rem;     /* 24px */
  --fs-3xl:  1.875rem;   /* 30px */
  --fs-4xl:  2.25rem;    /* 36px */
  --fs-5xl:  3rem;       /* 48px */
  --fs-6xl:  3.75rem;    /* 60px */

  --fw-normal:    400;
  --fw-medium:    500;
  --fw-semibold:  600;
  --fw-bold:      700;

  --lh-tight:   1.25;
  --lh-snug:    1.375;
  --lh-normal:  1.5;
  --lh-relaxed: 1.625;

  /* 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;

  /* Radii */
  --radius-sm:  0.375rem;
  --radius-md:  0.5rem;
  --radius-lg:  0.75rem;
  --radius-xl:  1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm:  0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-md:  0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg:  0 8px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px var(--c-accent-glow);

  /* Transitions */
  --transition-fast:   0.15s ease-out;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow:   0.5s cubic-bezier(0.4, 0, 0.2, 1);

  /* Layout */
  --container-max: 72rem;     /* 1152px */
  --container-px:  var(--space-6);
  --nav-height:    4rem;
  --section-py:    var(--space-24);
}

/* ──────────────────────────────────────────────
   2. BASE / GLOBAL
   ────────────────────────────────────────────── */
html {
  color-scheme: dark;
  background-color: var(--c-bg);
  color: var(--c-text-primary);
}

body {
  font-family: var(--font-body);
  font-size: var(--fs-base);
  font-weight: var(--fw-normal);
  line-height: var(--lh-normal);
  color: var(--c-text-primary);
  background-color: var(--c-bg);
}

/* Smooth focus outline */
:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* ──────────────────────────────────────────────
   3. LAYOUT — CONTAINER
   ────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-px);
}

/* ──────────────────────────────────────────────
   4. TYPOGRAPHY UTILITIES
   ────────────────────────────────────────────── */
.section-eyebrow {
  font-family: var(--font-body);
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: var(--space-3);
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(var(--fs-3xl), 4vw, var(--fs-5xl));
  font-weight: var(--fw-bold);
  line-height: var(--lh-tight);
  color: var(--c-text-primary);
  margin-bottom: var(--space-4);
}

.section-subtitle {
  font-size: var(--fs-lg);
  color: var(--c-text-secondary);
  max-width: 52ch;
  line-height: var(--lh-relaxed);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-16);
}

.section-header .section-subtitle {
  margin-inline: auto;
}

/* ──────────────────────────────────────────────
   5. NAVIGATION
   ────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  background-color: rgba(10, 10, 11, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-normal);
}

.site-header.scrolled {
  border-color: var(--c-border);
}

.nav {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
}

.nav__logo {
  font-family: var(--font-heading);
  font-size: var(--fs-xl);
  font-weight: var(--fw-bold);
  color: var(--c-text-primary);
  display: flex;
  align-items: baseline;
  gap: 1px;
  transition: opacity var(--transition-fast);
}

.nav__logo:hover { opacity: 0.8; }

.nav__logo-dot {
  color: var(--c-accent);
  font-size: var(--fs-2xl);
  line-height: 1;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav__link {
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--c-text-secondary);
  transition: color var(--transition-fast);
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--c-accent);
  border-radius: var(--radius-full);
  transform: scaleX(0);
  transition: transform var(--transition-fast);
}

.nav__link:hover,
.nav__link.active {
  color: var(--c-text-primary);
}

.nav__link:hover::after,
.nav__link.active::after {
  transform: scaleX(1);
}

/* Hamburger — hidden on desktop */
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
}

.nav__hamburger:hover {
  background-color: var(--c-surface-hover);
}

.hamburger-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--c-text-secondary);
  border-radius: var(--radius-full);
  transition: transform var(--transition-normal), opacity var(--transition-fast);
}

/* Mobile nav open state */
.nav__hamburger[aria-expanded="true"] .hamburger-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav__hamburger[aria-expanded="true"] .hamburger-bar:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.nav__hamburger[aria-expanded="true"] .hamburger-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ──────────────────────────────────────────────
   6. HERO SECTION
   ────────────────────────────────────────────── */
.hero {
  position: relative;
  overflow: hidden;
  padding-top: calc(var(--section-py) + var(--space-8));
  padding-bottom: var(--section-py);
  min-height: calc(100dvh - var(--nav-height));
  display: flex;
  align-items: center;
}

/* Radial background glow */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 60% 40%, rgba(59, 130, 246, 0.08) 0%, transparent 70%),
    radial-gradient(ellipse 60% 40% at 20% 80%, rgba(139, 92, 246, 0.05) 0%, transparent 60%);
  pointer-events: none;
}

.hero__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: var(--space-16);
  position: relative;
  z-index: 1;
}

.hero__eyebrow {
  font-family: var(--font-body);
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: var(--space-4);
}

.hero__title {
  font-family: var(--font-heading);
  font-size: clamp(var(--fs-4xl), 5vw, var(--fs-6xl));
  font-weight: var(--fw-bold);
  line-height: var(--lh-tight);
  color: var(--c-text-primary);
  margin-bottom: var(--space-6);
}

.hero__title--accent {
  background: linear-gradient(135deg, var(--c-accent) 0%, #818cf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  font-size: var(--fs-lg);
  color: var(--c-text-secondary);
  line-height: var(--lh-relaxed);
  max-width: 46ch;
  margin-bottom: var(--space-10);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

/* Hero visual / decorative right column */
.hero__visual {
  position: relative;
  height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero__glow {
  position: absolute;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.15) 0%, transparent 70%);
  animation: pulse-glow 4s ease-in-out infinite;
}

.hero__grid-dots {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, var(--c-border) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 30%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 30%, transparent 100%);
  opacity: 0.5;
}

@keyframes pulse-glow {
  0%, 100% { transform: scale(1); opacity: 0.6; }
  50%       { transform: scale(1.15); opacity: 1; }
}

/* Hero floating cards */
.hero__cards {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  justify-content: center;
  gap: var(--space-4);
  padding: var(--space-6);
}

.hero__card {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-5);
  background: rgba(20, 20, 22, 0.85);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-md);
  width: fit-content;
}

.hero__card--top {
  animation: float-a 4s ease-in-out infinite;
}

.hero__card--mid {
  animation: float-b 4.5s ease-in-out infinite;
  margin-right: var(--space-6);
}

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

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

.hero__card-dot--green {
  background: #22c55e;
  box-shadow: 0 0 6px #22c55e;
  animation: var(--animate-pulse);
}

.hero__card-dot--blue {
  background: var(--c-accent);
  box-shadow: 0 0 6px var(--c-accent);
}

.hero__card-label {
  font-family: var(--font-body);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--c-text-primary);
}

.hero__card-badge {
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  color: var(--c-text-muted);
  background: var(--c-surface-hover);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-full);
  padding: 0.15rem 0.45rem;
  line-height: 1.5;
}

/* Stat ring */
.hero__stat-ring {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 96px;
  height: 96px;
  border-radius: 50%;
  border: 2px solid var(--c-accent);
  box-shadow: 0 0 20px var(--c-accent-glow);
  background: var(--c-accent-soft);
  align-self: center;
  margin-top: var(--space-4);
  animation: float-a 5s ease-in-out infinite;
}

.hero__stat-number {
  font-family: var(--font-heading);
  font-size: var(--fs-4xl);
  font-weight: var(--fw-bold);
  line-height: 1;
  color: var(--c-text-primary);
}

.hero__stat-text {
  font-size: 0.6rem;
  font-weight: var(--fw-semibold);
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--c-text-muted);
  line-height: 1.3;
}

/* Hero accent word — TS cycling uses opacity transition */
.hero__title--accent {
  display: inline-block;
  transition: opacity 0.4s ease-out;
}

/* ──────────────────────────────────────────────
   7. PROJECTS SECTION
   ────────────────────────────────────────────── */
.projects {
  padding-block: var(--section-py);
  position: relative;
}

/* Subtle top divider */
.projects::before {
  content: '';
  display: block;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--c-border), transparent);
  margin-bottom: var(--section-py);
}

.projects__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-8);
}

/* ──────────────────────────────────────────────
   8. ABOUT SECTION
   ────────────────────────────────────────────── */
.about {
  padding-block: var(--section-py);
  background-color: var(--c-surface);
  border-top: 1px solid var(--c-border);
  border-bottom: 1px solid var(--c-border);
}

.about__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: start;
}

.about__text {
  color: var(--c-text-secondary);
  line-height: var(--lh-relaxed);
  margin-bottom: var(--space-4);
}

.about__text:last-of-type { margin-bottom: 0; }

.about__content .section-title {
  margin-bottom: var(--space-6);
}

/* Tech stack grid */
.about__stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.about__stack-label {
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  color: var(--c-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.stack-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.stack-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-5);
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  min-width: 80px;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.stack-item:hover {
  border-color: var(--c-accent);
  background-color: var(--c-accent-soft);
}

.stack-item span {
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
  color: var(--c-text-secondary);
}

/* ──────────────────────────────────────────────
   9. CONTACT SECTION
   ────────────────────────────────────────────── */
.contact {
  padding-block: var(--section-py);
}

.contact__inner {
  text-align: center;
}

.contact__inner .section-title {
  margin-bottom: var(--space-4);
}

.contact__subtitle {
  font-size: var(--fs-lg);
  color: var(--c-text-secondary);
  line-height: var(--lh-relaxed);
  max-width: 48ch;
  margin-inline: auto;
  margin-bottom: var(--space-12);
}

.contact__links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-6);
}

/* ──────────────────────────────────────────────
   10. FOOTER
   ────────────────────────────────────────────── */
.site-footer {
  padding-block: var(--space-8);
  border-top: 1px solid var(--c-border);
}

.site-footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  flex-wrap: wrap;
}

.site-footer__copy {
  font-size: var(--fs-sm);
  color: var(--c-text-muted);
}

.site-footer__links {
  display: flex;
  gap: var(--space-6);
}

.site-footer__link {
  font-size: var(--fs-sm);
  color: var(--c-text-muted);
  transition: color var(--transition-fast);
}

.site-footer__link:hover { color: var(--c-text-secondary); }

/* ──────────────────────────────────────────────
   PHASE 4 ADDITIONS
   ────────────────────────────────────────────── */

/* About — values pillars */
.about__text:last-of-type { margin-bottom: var(--space-8); }

.about__values {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.about__value {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.about__value:hover {
  border-color: rgba(59, 130, 246, 0.3);
  background-color: var(--c-accent-soft);
}

.about__value-icon {
  font-size: var(--fs-base);
  color: var(--c-accent);
  line-height: 1.6;
  flex-shrink: 0;
}

.about__value-title {
  display: block;
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  color: var(--c-text-primary);
  margin-bottom: var(--space-1);
}

.about__value-desc {
  font-size: var(--fs-sm);
  color: var(--c-text-muted);
  line-height: var(--lh-relaxed);
}

/* Contact — restructured layout */
.contact__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-10);
}

.contact__header { width: 100%; }

.contact__header .section-title {
  margin-bottom: var(--space-4);
}

.contact__subtitle {
  max-width: 48ch;
  margin-inline: auto;
  margin-bottom: 0;
}

/* Conversation CTA block */
.contact__cta {
  width: 100%;
  max-width: 640px;
}

.contact__cta-inner {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  padding: var(--space-5) var(--space-6);
  background: var(--c-accent-soft);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: var(--radius-xl);
  text-align: left;
}

.contact__cta-icon {
  color: var(--c-accent);
  flex-shrink: 0;
  margin-top: 2px;
}

.contact__cta-text {
  font-size: var(--fs-sm);
  color: var(--c-text-secondary);
  line-height: var(--lh-relaxed);
}

/* Footer — brand block and bottom bar */
.site-footer__inner {
  padding-block: var(--space-8);
}

.site-footer__brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.site-footer__logo {
  font-family: var(--font-heading);
  font-size: var(--fs-xl);
  font-weight: var(--fw-bold);
  color: var(--c-text-primary);
  display: inline-flex;
  align-items: baseline;
  gap: 1px;
  transition: opacity var(--transition-fast);
}

.site-footer__logo:hover { opacity: 0.75; }

.site-footer__logo-dot {
  color: var(--c-accent);
  font-size: var(--fs-2xl);
  line-height: 1;
}

.site-footer__tagline {
  font-size: var(--fs-xs);
  color: var(--c-text-muted);
  font-style: italic;
}

.site-footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-block: var(--space-5);
  border-top: 1px solid var(--c-border);
  flex-wrap: wrap;
}

.site-footer__copy {
  font-size: var(--fs-xs);
  color: var(--c-text-muted);
}

.site-footer__back-top {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
  color: var(--c-text-muted);
  transition: color var(--transition-fast);
}

.site-footer__back-top:hover { color: var(--c-accent); }

/* Responsive additions for Phase 4 */
@media (max-width: 900px) {
  .about__values {
    margin-top: var(--space-6);
  }
}

@media (max-width: 640px) {
  .contact__cta-inner {
    flex-direction: column;
    gap: var(--space-3);
  }

  .site-footer__bottom {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .site-footer__brand {
    align-items: center;
  }
}

/* ──────────────────────────────────────────────
   11. SCROLL REVEAL — base state
   JS adds .revealed to trigger entrance animations
   ────────────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

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

.reveal--delay-1 { transition-delay: 0.1s; }
.reveal--delay-2 { transition-delay: 0.2s; }
.reveal--delay-3 { transition-delay: 0.3s; }

/* ──────────────────────────────────────────────
   12. RESPONSIVE — TABLET (< 900px)
   ────────────────────────────────────────────── */
@media (max-width: 900px) {
  :root {
    --section-py: var(--space-16);
    --container-px: var(--space-5);
  }

  .hero__inner {
    grid-template-columns: 1fr;
    gap: var(--space-10);
  }

  .hero__visual { display: none; }

  .projects__grid {
    grid-template-columns: 1fr;
    max-width: 520px;
    margin-inline: auto;
  }

  .about__inner {
    grid-template-columns: 1fr;
    gap: var(--space-12);
  }
}

/* ──────────────────────────────────────────────
   13. RESPONSIVE — MOBILE (< 640px)
   ────────────────────────────────────────────── */
@media (max-width: 640px) {
  :root {
    --section-py: var(--space-12);
    --container-px: var(--space-4);
  }

  /* Mobile nav */
  .nav__hamburger {
    display: flex;
  }

  .nav__links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--c-bg);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--space-10);
    transform: translateX(100%);
    transition: transform var(--transition-normal);
  }

  .nav__links.open {
    transform: translateX(0);
  }

  .nav__link {
    font-size: var(--fs-xl);
  }

  .hero {
    min-height: auto;
    padding-block: var(--space-16);
  }

  .hero__actions {
    flex-direction: column;
    align-items: flex-start;
  }

  .hero__actions .btn {
    width: 100%;
    justify-content: center;
  }

  .site-footer__inner {
    flex-direction: column;
    text-align: center;
  }
}