/* ============================================================
   Osman Şahin — Kişisel Site
   Modernize: vendor-prefix yok, CSS custom properties,
               Elms Sans fontu, temiz keyframe'ler
   ============================================================ */

@import url("https://fonts.googleapis.com/css2?family=Elms+Sans:ital,wght@0,100..900;1,100..900&display=swap");

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

html,
body {
  height: 100%;
  overflow: hidden;
}

article,
aside,
details,
figcaption,
figure,
footer,
header,
main,
menu,
nav,
section,
summary {
  display: block;
}

ol,
ul {
  list-style: none;
}

/* ── Tokens ── */
:root {
  --font-body: 'Elms Sans', sans-serif;
  --font-size-base: 15pt;
  --color-text: #fff;
  --color-bg-fallback: #348cb2;
  --transition-fast: 0.2s ease-in-out;
  --anim-duration-wrapper: 3s;
  --anim-duration-overlay: 1.5s;
  --anim-delay-overlay: 1.5s;
  --anim-duration-header: 1s;
  --anim-delay-header: 2.25s;
  --icon-size: 5.35em;
}

/* ── Base ── */
body {
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  font-weight: 300;
  letter-spacing: -0.025em;
  line-height: 1.75;
  color: var(--color-text);
  background: var(--color-bg-fallback);
  -webkit-text-size-adjust: none;
}

/* Animasyonları yükleme sırasında durdur */
body.loading * {
  animation: none !important;
}

a {
  color: inherit;
  text-decoration: none;
  outline: 0;
  border-bottom: dotted 1px;
  transition: border-color var(--transition-fast);
}

a:hover {
  border-color: transparent;
}

/* ── Keyframes ── */
@keyframes wrapper {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@keyframes bg {
  from {
    transform: translate3d(0, 0, 0);
  }

  to {
    transform: translate3d(var(--bg-scroll-end), 0, 0);
  }
}

@keyframes overlay {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@keyframes header {
  from {
    transform: translate3d(0, 1em, 0);
    opacity: 0;
  }

  to {
    transform: translate3d(0, 0, 0);
    opacity: 1;
  }
}

@keyframes nav-icons {
  from {
    transform: translate3d(0, 1em, 0);
    opacity: 0;
  }

  to {
    transform: translate3d(0, 0, 0);
    opacity: 1;
  }
}

/* ── Wrapper ── */
#wrapper {
  animation: wrapper var(--anim-duration-wrapper) forwards;
  height: 100%;
  left: 0;
  opacity: 0;
  position: fixed;
  top: 0;
  width: 100%;
}

/* ── Background ── */
:root {
  --bg-scroll-end: -2250px;
}

#bg {
  --bg-size: 2250px;
  animation: bg 60s linear infinite;
  backface-visibility: hidden;
  transform: translate3d(0, 0, 0);
  background: var(--color-bg-fallback) url("images/bg.jpg") bottom left;
  background-repeat: repeat-x;
  background-size: var(--bg-size) auto;
  height: 100%;
  left: 0;
  opacity: 1;
  position: fixed;
  top: 0;
  width: calc(var(--bg-size) * 3);
}

/* ── Overlay ── */
#overlay {
  animation: overlay var(--anim-duration-overlay) var(--anim-delay-overlay) forwards;
  background-attachment: fixed, fixed;
  background-image: url("images/overlay-pattern.png"), url("images/overlay.svg");
  background-position: top left, center center;
  background-repeat: repeat, no-repeat;
  background-size: auto, cover;
  height: 100%;
  left: 0;
  opacity: 0;
  position: fixed;
  top: 0;
  width: 100%;
}

/* ── Main ── */
#main {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  left: 0;
  position: fixed;
  text-align: center;
  top: 0;
  width: 100%;
}

/* ── Header ── */
#header {
  animation: header var(--anim-duration-header) var(--anim-delay-header) forwards;
  backface-visibility: hidden;
  transform: translate3d(0, 0, 0);
  cursor: default;
  opacity: 0;
  position: relative;
  text-align: center;
  width: 90%;
}

#header h1 {
  font-size: 4.35em;
  font-weight: 900;
  letter-spacing: -0.035em;
  line-height: 1;
}

#header p {
  font-size: 1.25em;
  margin: 0.75em 0 0.25em;
  opacity: 0.75;
}

#header nav {
  margin: 1.5em 0 0;
}

#header nav ul {
  display: flex;
  justify-content: center;
  gap: 0.25em;
  flex-wrap: wrap;
}

#header nav li {
  animation: nav-icons 0.5s ease-in-out forwards;
  backface-visibility: hidden;
  transform: translate3d(0, 0, 0);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: var(--icon-size);
  width: var(--icon-size);
  opacity: 0;
}

/* Kademeli ikon animasyon gecikmeleri */
#header nav li:nth-child(1) {
  animation-delay: 2.50s;
}

#header nav li:nth-child(2) {
  animation-delay: 2.75s;
}

#header nav li:nth-child(3) {
  animation-delay: 3.00s;
}

#header nav li:nth-child(4) {
  animation-delay: 3.25s;
}

#header nav li:nth-child(5) {
  animation-delay: 3.50s;
}

#header nav li:nth-child(6) {
  animation-delay: 3.75s;
}

#header nav li:nth-child(7) {
  animation-delay: 4.00s;
}

#header nav li:nth-child(8) {
  animation-delay: 4.25s;
}

#header nav li:nth-child(9) {
  animation-delay: 4.50s;
}

#header nav li:nth-child(10) {
  animation-delay: 4.75s;
}

#header nav a {
  -webkit-tap-highlight-color: transparent;
  border: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: solid 1px #fff;
  font-size: 1.75em;
  height: 2.5em;
  width: 2.5em;
  transition: all var(--transition-fast);
}

#header nav a:hover {
  font-size: 1.925em;
  /* 1.75 * 1.1 */
  background-color: rgba(255, 255, 255, 0.175);
}

#header nav a:active {
  font-size: 1.6625em;
  /* 1.75 * 0.95 */
  background-color: rgba(255, 255, 255, 0.35);
}

/* ── Footer ── */
#footer {
  background: linear-gradient(to bottom, transparent, rgba(0, 0, 0, 0.5) 75%);
  bottom: 0;
  cursor: default;
  height: 6em;
  left: 0;
  line-height: 8em;
  position: absolute;
  text-align: center;
  width: 100%;
}

/* ── Responsive: Wide (≤ 1680px) ── */
@media screen and (max-width: 1680px) {
  :root {
    --bg-scroll-end: -1500px;
  }

  body {
    font-size: 13pt;
  }

  #bg {
    --bg-size: 1500px;
    background-size: var(--bg-size) auto;
    width: calc(var(--bg-size) * 3);
  }
}

/* ── Responsive: Normal (≤ 1280px) ── */
@media screen and (max-width: 1280px) {
  :root {
    --bg-scroll-end: -750px;
  }

  body {
    font-size: 12pt;
  }

  #bg {
    --bg-size: 750px;
    background-size: var(--bg-size) auto;
    width: calc(var(--bg-size) * 3);
  }
}

/* ── Responsive: Mobile (≤ 736px) ── */
@media screen and (max-width: 736px) {
  :root {
    --bg-scroll-end: -300px;
  }

  body {
    min-width: 320px;
    font-size: 11pt;
  }

  #bg {
    --bg-size: 300px;
    background-size: var(--bg-size) auto;
    width: calc(var(--bg-size) * 3);
  }

  #header h1 {
    font-size: 2.5em;
  }

  #header p {
    font-size: 1em;
  }

  #header nav {
    font-size: 1em;
  }

  #header nav a:hover,
  #header nav a:active {
    font-size: 1.75em;
  }
}

/* ── Responsive: Mobile Portrait (≤ 480px) ── */
@media screen and (max-width: 480px) {
  :root {
    --bg-scroll-end: -412.5px;
  }

  #bg {
    --bg-size: 412.5px;
    background-size: var(--bg-size) auto;
    width: calc(var(--bg-size) * 3);
  }

  #header nav {
    padding: 0 1em;
  }
}