/* ================================================
   ΤΕΚΝΟΣ — Prodromidis Mathematics Tutoring
   Design: Academic Prestige × Greek Classicism
   ================================================ */

/* ── Design Tokens ── */
:root {
  --navy:          #0e1c32;
  --navy-mid:      #1a2f52;
  --navy-soft:     #243b67;
  --gold:          #b8852a;
  --gold-bright:   #d4a040;
  --gold-pale:     #f3e4c0;
  --gold-dim:      rgba(184, 133, 42, .12);
  --cream:         #f9f6f1;
  --white:         #ffffff;
  --gray-50:       #f4f1ed;
  --gray-100:      #ede8e0;
  --gray-200:      #ddd8ce;
  --gray-400:      #a89f93;
  --gray-600:      #6d6660;
  --gray-800:      #3a3530;
  --text:          #1c1814;
  --text-sec:      #4a4038;
  --text-muted:    #7c7268;
  --border:        #e3ddd4;
  --border-gold:   rgba(184, 133, 42, .22);
  --radius:        6px;
  --radius-md:     10px;
  --radius-lg:     16px;
  --shadow-xs:     0 1px 2px rgba(14,28,50,.05);
  --shadow-sm:     0 2px 8px rgba(14,28,50,.07), 0 1px 3px rgba(14,28,50,.04);
  --shadow-md:     0 6px 24px rgba(14,28,50,.10), 0 2px 8px rgba(14,28,50,.06);
  --shadow-lg:     0 16px 48px rgba(14,28,50,.14), 0 4px 16px rgba(14,28,50,.08);
  --transition:    200ms cubic-bezier(.4, 0, .2, 1);
  --transition-md: 280ms cubic-bezier(.4, 0, .2, 1);
}

/* ── Reset ── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: 'Manrope', sans-serif;
  background: var(--cream);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

/* ── Container ── */
.container {
  width: min(1140px, 100% - 3rem);
  margin-inline: auto;
}

/* ── Typography ── */
h1, h2, h3 {
  font-family: 'Noto Serif Greek', serif;
  line-height: 1.2;
  color: var(--navy);
  font-style: normal;
}

h1 { font-size: clamp(2.1rem, 5vw, 3.4rem); font-weight: 700; letter-spacing: -.02em; }
h2 { font-size: clamp(1.5rem, 3.2vw, 2.3rem); font-weight: 600; letter-spacing: -.015em; }
h3 { font-size: 1.1rem; font-weight: 600; }

p   { line-height: 1.78; max-width: 66ch; }
a   { color: inherit; text-decoration: none; }
ul  { list-style: none; }

/* ── Eyebrow label ── */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .625rem;
  font-size: .68rem;
  font-weight: 800;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--gold);
  font-family: 'Manrope', sans-serif;
}

.eyebrow::before {
  content: '';
  display: inline-block;
  width: 28px;
  height: 2px;
  background: linear-gradient(90deg, var(--gold), var(--gold-bright));
  flex-shrink: 0;
  border-radius: 1px;
}

/* ── Buttons ── */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .8rem 1.875rem;
  border-radius: var(--radius-md);
  font-family: 'Manrope', sans-serif;
  font-size: .875rem;
  font-weight: 700;
  letter-spacing: .025em;
  cursor: pointer;
  white-space: nowrap;
  transition:
    transform var(--transition),
    box-shadow var(--transition),
    background var(--transition),
    color var(--transition),
    border-color var(--transition);
  will-change: transform;
}

.button:active { transform: translateY(1px) !important; }

.button.primary {
  background: var(--navy);
  color: var(--white);
  box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255,255,255,.06);
}

.button.primary:hover {
  background: var(--navy-mid);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.button.secondary {
  background: transparent;
  color: var(--navy);
  border: 1.5px solid var(--navy);
}

.button.secondary:hover {
  background: var(--navy);
  color: var(--white);
  transform: translateY(-2px);
}


/* ================================================
   HEADER / NAV
   ================================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: rgba(249, 246, 241, .86);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--transition-md);
}

.site-header.scrolled {
  box-shadow: 0 2px 20px rgba(14, 28, 50, .10);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.brand {
  font-family: 'Noto Serif Greek', serif;
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--navy);
  position: relative;
  padding-bottom: 2px;
}

.brand::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--gold), var(--gold-bright));
  border-radius: 1px;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-md);
}

.brand:hover::after { transform: scaleX(1); }

.nav-links {
  display: flex;
  align-items: center;
  gap: .125rem;
}

.nav-links a {
  padding: .5rem .9rem;
  font-size: .875rem;
  font-weight: 600;
  color: var(--text-sec);
  border-radius: var(--radius);
  transition: color var(--transition), background var(--transition);
}

.nav-links a:not(.nav-cta):hover {
  color: var(--navy);
  background: var(--gray-100);
}

.nav-cta {
  background: var(--navy) !important;
  color: var(--white) !important;
  padding: .5rem 1.3rem !important;
  margin-left: .5rem;
  border-radius: var(--radius-md) !important;
  box-shadow: var(--shadow-xs);
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition) !important;
}

.nav-cta:hover {
  background: var(--navy-mid) !important;
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm) !important;
}


/* ================================================
   HERO
   ================================================ */

.hero {
  padding: 7rem 0 5.5rem;
  display: grid;
  grid-template-columns: 1fr 280px;
  align-items: start;
  gap: 4rem;
  position: relative;
}

/* Geometric grid decoration — top right quadrant */
.hero::before {
  content: '';
  position: absolute;
  top: -60px;
  right: -80px;
  width: 600px;
  height: 600px;
  background-image:
    linear-gradient(var(--gold-dim) 1px, transparent 1px),
    linear-gradient(90deg, var(--gold-dim) 1px, transparent 1px);
  background-size: 44px 44px;
  border-radius: 50%;
  mask-image: radial-gradient(circle at 55% 45%, rgba(0,0,0,.55) 0%, transparent 68%);
  -webkit-mask-image: radial-gradient(circle at 55% 45%, rgba(0,0,0,.55) 0%, transparent 68%);
  pointer-events: none;
  z-index: 0;
}

/* Subtle golden orb behind the card */
.hero::after {
  content: '';
  position: absolute;
  top: 60px;
  right: 60px;
  width: 320px;
  height: 320px;
  background: radial-gradient(circle, rgba(184,133,42,.07) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.hero-copy {
  position: relative;
  z-index: 1;
  animation: fadeUp .7s ease both;
}

.hero-copy .eyebrow {
  margin-bottom: 1.25rem;
}

.hero-copy h1 {
  margin-bottom: 1.375rem;
  font-style: italic;
}

.hero-copy .subtitle {
  font-size: 1.075rem;
  color: var(--text-sec);
  margin-bottom: 2.75rem;
  line-height: 1.75;
  max-width: 54ch;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Floating info card */
.hero-card {
  position: relative;
  z-index: 1;
  background: var(--navy);
  color: var(--white);
  padding: 2.25rem 2rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 2.5rem;
  animation: fadeUp .7s .15s ease both;
}

/* Inner shimmer */
.hero-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  background: linear-gradient(
    135deg,
    rgba(184,133,42,.18) 0%,
    transparent 50%
  );
  pointer-events: none;
}

/* Golden top edge */
.hero-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 2rem;
  right: 2rem;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--gold-bright), transparent);
  border-radius: 0 0 2px 2px;
}

.hero-card strong {
  font-size: .68rem;
  font-weight: 800;
  letter-spacing: .17em;
  text-transform: uppercase;
  color: var(--gold-bright);
  font-family: 'Manrope', sans-serif;
}

.hero-card span {
  font-size: .88rem;
  line-height: 1.65;
  color: rgba(255, 255, 255, .68);
}

/* ── Divider between hero-card rows ── */
.hero-card span + span {
  padding-top: .875rem;
  border-top: 1px solid rgba(255, 255, 255, .08);
}


/* ================================================
   SECTIONS
   ================================================ */

.section {
  padding: 5.5rem 0;
}

.section-heading {
  margin-bottom: 3.25rem;
}

.section-heading .eyebrow {
  display: block;
  margin-bottom: 1rem;
}

.section-heading h2 {
  font-style: italic;
}

/* Thin rule under every section title */
.section-heading::after {
  content: '';
  display: block;
  width: 48px;
  height: 2px;
  background: var(--gold);
  border-radius: 1px;
  margin-top: 1.25rem;
}

/* ── Animated entrance on scroll ── */
.section-heading,
.card,
.content-card,
.contact-item,
.pill-list {
  animation: fadeUp .6s ease both;
}

.card:nth-child(1) { animation-delay: .05s; }
.card:nth-child(2) { animation-delay: .10s; }
.card:nth-child(3) { animation-delay: .15s; }
.card:nth-child(4) { animation-delay: .20s; }
.card:nth-child(5) { animation-delay: .25s; }
.card:nth-child(6) { animation-delay: .30s; }

.contact-item:nth-child(1) { animation-delay: .05s; }
.contact-item:nth-child(2) { animation-delay: .10s; }
.contact-item:nth-child(3) { animation-delay: .15s; }


/* ── Profile ── */
#profile {
  background: linear-gradient(180deg, var(--gray-50) 0%, var(--cream) 100%);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

#profile .section-heading::after { width: 32px; }

.content-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.625rem;
  max-width: 720px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 1.125rem;
  position: relative;
  overflow: hidden;
}

/* Faint corner flourish */
.content-card::before {
  content: '';
  position: absolute;
  bottom: 0;
  right: 0;
  width: 120px;
  height: 120px;
  background:
    linear-gradient(135deg, transparent 45%, var(--gold-dim) 45%);
  pointer-events: none;
}

.content-card p {
  color: var(--text-sec);
  max-width: 58ch;
}

/* Inline ornamental separator between paragraphs */
.content-card p + p::before {
  content: '';
  display: block;
  width: 32px;
  height: 1px;
  background: var(--border);
  margin-bottom: 1.125rem;
}


/* ── Courses Grid ── */
.grid.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(286px, 1fr));
  gap: 1.25rem;
}

.card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem 1.875rem;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition:
    transform var(--transition-md),
    box-shadow var(--transition-md),
    border-color var(--transition-md);
  cursor: default;
}

/* Left accent bar */
.card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--gold), var(--gold-bright));
  border-radius: 0 2px 2px 0;
  transform: scaleY(0);
  transform-origin: bottom;
  transition: transform 260ms cubic-bezier(.4, 0, .2, 1);
}

/* Mathematical index number */
.card::after {
  content: attr(data-index);
  position: absolute;
  top: 1.25rem;
  right: 1.5rem;
  font-family: 'Noto Serif Greek', serif;
  font-size: 2.5rem;
  font-weight: 700;
  font-style: italic;
  color: var(--gray-100);
  line-height: 1;
  pointer-events: none;
  transition: color var(--transition-md);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--gold-pale);
}

.card:hover::before { transform: scaleY(1); }
.card:hover::after  { color: var(--gold-dim); }

.card h3 {
  color: var(--navy);
  margin-bottom: .625rem;
  font-size: 1.075rem;
}

.card p {
  font-size: .875rem;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: none;
}


/* ── Free Material (Highlight) ── */
#material {
  background: var(--navy);
  padding: 5.5rem 0;
  border-top: none;
  position: relative;
  overflow: hidden;
}

/* Decorative dot grid on dark bg */
#material::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 28px 28px;
  pointer-events: none;
}

#material .container {
  position: relative;
  z-index: 1;
}

.material-inner {
  display: flex;
  align-items: flex-start;
  gap: 4rem;
  flex-wrap: wrap;
}

.material-text {
  flex: 1;
  min-width: 260px;
}

.material-text h2 {
  color: var(--white);
  font-style: italic;
  margin-top: .875rem;
  margin-bottom: 1.125rem;
}

.material-text p {
  color: rgba(255, 255, 255, .62);
  font-size: .95rem;
  max-width: 42ch;
  line-height: 1.75;
}

#material .eyebrow {
  color: var(--gold-bright);
}

#material .eyebrow::before {
  background: linear-gradient(90deg, var(--gold-bright), var(--gold-bright));
}

.pill-list {
  display: flex;
  flex-wrap: wrap;
  gap: .625rem;
  flex-shrink: 0;
  min-width: 260px;
  padding-top: .25rem;
  align-content: flex-start;
}

.pill-list li {
  padding: .45rem 1.125rem;
  background: rgba(255, 255, 255, .06);
  border: 1px solid rgba(255, 255, 255, .12);
  border-radius: 999px;
  font-size: .78rem;
  font-weight: 700;
  color: rgba(255, 255, 255, .75);
  letter-spacing: .04em;
  cursor: default;
  transition:
    background var(--transition),
    border-color var(--transition),
    color var(--transition),
    transform var(--transition);
}

.pill-list li:hover {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--navy);
  transform: translateY(-2px);
}



/* ── Contact ── */
#contact {
  padding-bottom: 7rem;
}

#contact .section-heading::after { width: 36px; }

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
}

.contact-item {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem 1.875rem;
  display: flex;
  flex-direction: column;
  gap: .625rem;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  text-decoration: none;
  transition:
    transform var(--transition-md),
    box-shadow var(--transition-md),
    border-color var(--transition-md);
}

/* Bottom gold accent bar */
.contact-item::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--gold), var(--gold-bright));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 280ms cubic-bezier(.4, 0, .2, 1);
}

a.contact-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--gold-pale);
}

a.contact-item:hover::after { transform: scaleX(1); }

.contact-item span {
  font-size: .67rem;
  font-weight: 800;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.contact-item strong {
  font-size: .975rem;
  font-weight: 700;
  color: var(--navy);
  font-family: 'Manrope', sans-serif;
  line-height: 1.45;
  display: block;
}


/* ================================================
   FOOTER
   ================================================ */

.footer {
  background: var(--navy);
  color: rgba(255, 255, 255, .38);
  padding: 2.25rem 0;
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .06em;
  text-align: center;
  border-top: 1px solid rgba(255, 255, 255, .06);
}

.footer .container {
  display: flex;
  align-items: center;
  justify-content: center;
}


/* ================================================
   ANIMATIONS
   ================================================ */

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Respect user preference */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    transition-duration: .01ms !important;
  }
}


/* ================================================
   RESPONSIVE
   ================================================ */

@media (max-width: 860px) {
  .hero {
    grid-template-columns: 1fr;
    padding: 5rem 0 4rem;
    gap: 2.5rem;
  }

  .hero-card {
    max-width: 420px;
    margin-top: 0;
  }

  .hero::before,
  .hero::after {
    display: none;
  }

  #material .material-inner {
    flex-direction: column;
    gap: 2.5rem;
  }

  .pill-list {
    min-width: auto;
  }
}

@media (max-width: 640px) {
  .container {
    width: calc(100% - 2.5rem);
  }

  .nav-links a:not(.nav-cta) {
    display: none;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

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

  .hero-card {
    max-width: none;
  }

  .grid.cards {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 4rem 0;
  }

  #material {
    padding: 4rem 0;
  }

  #contact {
    padding-bottom: 5rem;
  }

  .content-card {
    padding: 1.875rem 1.625rem;
  }

  .card {
    padding: 1.625rem 1.5rem;
  }
}

@media (max-width: 400px) {
  h1 { font-size: 1.9rem; }
  h2 { font-size: 1.5rem; }
}