/* ==========================================================================
   Onur Koçak — Portfolio
   base.css : design tokens, reset, typography, nav, footer, shared UI
   ========================================================================== */

/* ---------- Tokens ---------- */
:root {
  /* Base palette */
  --bg:            #06060c;
  --bg-2:          #0b0b16;
  --surface:       rgba(255, 255, 255, 0.035);
  --surface-2:     rgba(255, 255, 255, 0.06);
  --border:        rgba(255, 255, 255, 0.09);
  --border-strong: rgba(255, 255, 255, 0.16);

  --text:          #f4f4fb;
  --text-2:        #b6b6cc;
  --text-3:        #7c7c96;

  /* Brand */
  --brand:         #7c5cff;
  --brand-2:       #ff4d9d;
  --brand-3:       #22e0c8;

  /* Per-app accents — taken from each app's own artwork */
  --viberoute-1:   #38a9ff;
  --viberoute-2:   #22e0c8;
  --firuzan-1:     #a855f7;
  --firuzan-2:     #f5b544;
  --gecis-1:       #22e06b;
  --gecis-2:       #c8f531;
  --tavla-1:       #ff9a3d;
  --tavla-2:       #e2453d;

  /* Active accent — overridden per app section / page */
  --accent:        var(--brand);
  --accent-2:      var(--brand-2);

  /* Type */
  --font-display: "Sora", "Segoe UI", system-ui, sans-serif;
  --font-body:    "Inter", "Segoe UI", system-ui, sans-serif;

  /* Space & shape */
  --radius-sm: 10px;
  --radius:    18px;
  --radius-lg: 28px;
  --radius-xl: 40px;

  --shell:     min(1200px, 100% - 2.5rem);
  --nav-h:     72px;

  --ease:      cubic-bezier(0.22, 1, 0.36, 1);
  --ease-out:  cubic-bezier(0.16, 1, 0.3, 1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 1.5rem);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img, svg, video, canvas { display: block; max-width: 100%; height: auto; }
button, input, textarea, select { font: inherit; color: inherit; }
a { color: inherit; text-decoration: none; }
ul, ol { margin: 0; padding: 0; list-style: none; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin: 0;
  text-wrap: balance;
}

p { margin: 0; text-wrap: pretty; }

::selection { background: var(--accent); color: #06060c; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* Ambient page glow */
body::before {
  content: "";
  position: fixed;
  inset: -30vmax;
  z-index: -2;
  pointer-events: none;
  background:
    radial-gradient(38vmax 38vmax at 18% 8%,  color-mix(in srgb, var(--brand) 26%, transparent), transparent 70%),
    radial-gradient(34vmax 34vmax at 84% 22%, color-mix(in srgb, var(--brand-2) 20%, transparent), transparent 70%),
    radial-gradient(40vmax 40vmax at 50% 96%, color-mix(in srgb, var(--brand-3) 16%, transparent), transparent 70%);
  filter: blur(18px);
  opacity: 0.75;
  animation: drift 26s var(--ease) infinite alternate;
}

/* Fine noise so the gradients never band */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.3;
  background-image: url("data:image/svg+xml,%3Csvg xmlns=%22http://www.w3.org/2000/svg%22 width=%22140%22 height=%22140%22%3E%3Cfilter id=%22n%22%3E%3CfeTurbulence type=%22fractalNoise%22 baseFrequency=%220.85%22 numOctaves=%223%22/%3E%3C/filter%3E%3Crect width=%22100%25%22 height=%22100%25%22 filter=%22url(%23n)%22 opacity=%220.42%22/%3E%3C/svg%3E");
}

@keyframes drift {
  0%   { transform: translate3d(0, 0, 0) scale(1); }
  50%  { transform: translate3d(2.5%, -2%, 0) scale(1.06); }
  100% { transform: translate3d(-2%, 2.5%, 0) scale(1.02); }
}

/* ---------- Layout ---------- */
.shell { width: var(--shell); margin-inline: auto; }

.section { padding: clamp(3.5rem, 8vw, 7rem) 0; position: relative; }

.section-head { max-width: 62ch; margin-bottom: clamp(2rem, 4vw, 3.25rem); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.1rem;
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--accent), transparent);
}

.h1 { font-size: clamp(2.6rem, 7.5vw, 5.2rem); }
.h2 { font-size: clamp(2rem, 4.6vw, 3.4rem); }
.h3 { font-size: clamp(1.25rem, 2.2vw, 1.6rem); }

.lede {
  font-size: clamp(1.02rem, 1.5vw, 1.18rem);
  color: var(--text-2);
  margin-top: 1.25rem;
}

.gradient-text {
  background: linear-gradient(100deg, var(--accent) 0%, var(--accent-2) 55%, var(--accent) 100%);
  background-size: 220% auto;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: shimmer 7s linear infinite;
}
@keyframes shimmer { to { background-position: 220% center; } }

/* ---------- Buttons ---------- */
.btn {
  --btn-bg: var(--surface-2);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.85rem 1.6rem;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: var(--btn-bg);
  color: var(--text);
  font-family: var(--font-display);
  font-size: 0.94rem;
  font-weight: 600;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.btn:hover { transform: translateY(-2px); border-color: var(--accent); }
.btn svg { width: 18px; height: 18px; flex: none; }

.btn--primary {
  border-color: transparent;
  color: #07070d;
  background: linear-gradient(115deg, var(--accent), var(--accent-2));
  box-shadow: 0 10px 34px -12px color-mix(in srgb, var(--accent) 85%, transparent);
}
.btn--primary:hover {
  box-shadow: 0 18px 46px -14px color-mix(in srgb, var(--accent) 95%, transparent);
}
.btn--primary::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: -60%;
  width: 45%;
  background: linear-gradient(100deg, transparent, rgba(255, 255, 255, 0.5), transparent);
  transform: skewX(-18deg);
  transition: left 0.65s var(--ease);
}
.btn--primary:hover::after { left: 115%; }

.btn--ghost { background: transparent; }

/* ---------- Cards / glass ---------- */
.glass {
  background: linear-gradient(160deg, var(--surface-2), var(--surface));
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-2);
  white-space: nowrap;
}

/* ---------- Skip link ---------- */
.skip {
  position: absolute;
  left: 1rem;
  top: -100px;
  z-index: 200;
  padding: 0.7rem 1.2rem;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  background: var(--accent);
  color: #06060c;
  font-weight: 600;
  transition: top 0.25s var(--ease);
}
.skip:focus { top: 0; }

/* ---------- Nav ---------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  border-bottom: 1px solid transparent;
  transition: background 0.35s var(--ease), border-color 0.35s var(--ease);
}
.nav.is-stuck {
  background: rgba(6, 6, 12, 0.72);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border-bottom-color: var(--border);
}
.nav__inner {
  width: var(--shell);
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.02em;
  font-size: 1.02rem;
}
.brand__mark {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 11px;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  color: #fff;
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0;
  box-shadow: 0 8px 22px -10px var(--brand);
}

.nav__links { display: flex; align-items: center; gap: 0.35rem; }
.nav__links a {
  padding: 0.5rem 0.95rem;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-2);
  transition: color 0.25s var(--ease), background 0.25s var(--ease);
}
.nav__links a:hover,
.nav__links a[aria-current="page"] { color: var(--text); background: var(--surface-2); }

.nav__actions { display: flex; align-items: center; gap: 0.6rem; }

/* Language toggle */
.lang {
  display: inline-flex;
  padding: 3px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  position: relative;
}
.lang button {
  position: relative;
  z-index: 1;
  min-height: 32px;
  padding: 0.4rem 0.8rem;
  border: 0;
  border-radius: 999px;
  background: transparent;
  font-family: var(--font-display);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text-3);
  cursor: pointer;
  transition: color 0.25s var(--ease);
}
.lang button[aria-pressed="true"] { color: #07070d; }
.lang__thumb {
  position: absolute;
  z-index: 0;
  top: 3px;
  bottom: 3px;
  border-radius: 999px;
  background: linear-gradient(120deg, var(--brand), var(--brand-2));
  transition: left 0.4s var(--ease), width 0.4s var(--ease);
}

/* Mobile menu button */
.nav__burger {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  cursor: pointer;
  padding: 0;
  place-items: center;
}
.nav__burger i {
  display: block;
  width: 17px;
  height: 2px;
  border-radius: 2px;
  background: var(--text);
  position: relative;
  transition: background 0.2s linear;
}
.nav__burger i::before,
.nav__burger i::after {
  content: "";
  position: absolute;
  left: 0;
  width: 17px;
  height: 2px;
  border-radius: 2px;
  background: var(--text);
  transition: transform 0.35s var(--ease), top 0.25s var(--ease);
}
.nav__burger i::before { top: -6px; }
.nav__burger i::after  { top: 6px; }
.nav.is-open .nav__burger i { background: transparent; }
.nav.is-open .nav__burger i::before { top: 0; transform: rotate(45deg); }
.nav.is-open .nav__burger i::after  { top: 0; transform: rotate(-45deg); }

@media (max-width: 900px) {
  .nav__burger { display: grid; }
  .nav__links {
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0.25rem;
    padding: 1rem 1.25rem 1.75rem;
    background: rgba(8, 8, 16, 0.96);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    transform: translateY(-14px);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s var(--ease), transform 0.3s var(--ease), visibility 0.3s;
  }
  .nav.is-open .nav__links { opacity: 1; visibility: visible; transform: none; }
  .nav__links a { padding: 0.85rem 1rem; font-size: 1.02rem; }
}

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--border);
  padding: clamp(3rem, 6vw, 4.5rem) 0 2.5rem;
  margin-top: clamp(3rem, 8vw, 6rem);
}
.footer__grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(2, minmax(0, 1fr));
  gap: clamp(2rem, 5vw, 4rem);
}
.footer__blurb { color: var(--text-2); max-width: 34ch; margin-top: 1rem; font-size: 0.94rem; }
.footer h4 {
  font-family: var(--font-display);
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 1.1rem;
}
.footer__list li + li { margin-top: 0.15rem; }
.footer__list a {
  display: inline-block;
  padding-block: 0.4rem;
  color: var(--text-2);
  font-size: 0.94rem;
  transition: color 0.25s var(--ease), padding-left 0.25s var(--ease);
}
.footer__list a:hover { color: var(--text); padding-left: 5px; }
.footer__bottom {
  margin-top: clamp(2.5rem, 5vw, 3.5rem);
  padding-top: 1.75rem;
  border-top: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: space-between;
  align-items: center;
  color: var(--text-3);
  font-size: 0.85rem;
}
@media (max-width: 760px) {
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .footer__brand { grid-column: 1 / -1; }
}

/* ---------- Scroll reveal ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
  transition-delay: var(--d, 0ms);
}
[data-reveal].is-in { opacity: 1; transform: none; }

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