/* ============================================
   MAIN.CSS — Simya Koleji
   Sadece: Topbar, Header, Navbar, Footer,
           Back to Top, Bottom Menu, Global Butonlar
   Mobile-first — Logo renkleri: #0072BC mavi
   ============================================ */

/* ---------- CSS Variables ---------- */
:root {
  --c-primary: #0072BC;
  --c-primary-dark: #004A7C;
  --c-primary-light: #E8F4FD;
  --c-accent: #F5A623;
  --c-accent-dark: #D4891A;
  --c-white: #ffffff;
  --c-light: #f7f9fc;
  --c-dark: #1e293b;
  --c-text: #334155;
  --c-gray: #64748b;
  --c-gray-light: #e2e8f0;
  --c-success: #059669;
  --c-green: #10b981;
  --c-purple: #7c3aed;
  --c-orange: #f97316;
  --c-teal: #0d9488;

  --ff-body: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --fw-normal: 400;
  --fw-medium: 500;
  --fw-semibold: 600;
  --fw-bold: 700;
  --fw-extrabold: 800;

  --shadow-xs: 0 1px 2px rgba(0,0,0,.05);
  --shadow-sm: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md: 0 4px 6px rgba(0,0,0,.07), 0 2px 4px rgba(0,0,0,.04);
  --shadow-lg: 0 10px 25px rgba(0,0,0,.1), 0 4px 10px rgba(0,0,0,.04);
  --shadow-xl: 0 20px 40px rgba(0,0,0,.12);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 20px;

  --transition: .25s cubic-bezier(.4,0,.2,1);
  --header-h: 64px;
  --topbar-h: 38px;
  --bottom-menu-h: 64px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + var(--topbar-h) + 1rem);
}

body {
  font-family: var(--ff-body);
  font-weight: var(--fw-normal);
  color: var(--c-text);
  background: var(--c-white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  padding-bottom: var(--bottom-menu-h);
}

img, picture, video, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none !important;
  transition: color var(--transition);
}

a:hover {
  text-decoration: none !important;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 2px;
}

ul, ol {
  list-style: none;
}

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0,0,0,0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.container {
  width: 100% !important;
  max-width: 100% !important;
  padding-right: 1rem;
  padding-left: 1rem;
  margin-right: auto;
  margin-left: auto;
}

@media (min-width: 768px) {
  .container {
    padding-right: 1.5rem;
    padding-left: 1.5rem;
  }
}

@media (min-width: 1200px) {
  .container {
    max-width: 1340px !important;
    padding-right: 2rem;
    padding-left: 2rem;
  }
}

/* ---------- Buttons (global) ---------- */
.btn {
  display: inline-flex !important;
  align-items: center;
  gap: .5rem;
  padding: .65rem 1.5rem;
  font-size: .9375rem;
  font-weight: var(--fw-semibold);
  font-family: var(--ff-body);
  line-height: 1.4;
  border-radius: var(--radius-md) !important;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  text-align: center;
  white-space: nowrap;
  text-decoration: none !important;
}

.btn--primary {
  background: var(--c-primary) !important;
  color: var(--c-white) !important;
  border-color: var(--c-primary) !important;
}

.btn--primary:hover,
.btn--primary:focus-visible {
  background: var(--c-primary-dark) !important;
  border-color: var(--c-primary-dark) !important;
  color: var(--c-white) !important;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--accent {
  background: var(--c-accent) !important;
  color: var(--c-white) !important;
  border-color: var(--c-accent) !important;
}

.btn--accent:hover,
.btn--accent:focus-visible {
  background: var(--c-accent-dark) !important;
  border-color: var(--c-accent-dark) !important;
  color: var(--c-white) !important;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--outline {
  background: transparent !important;
  color: var(--c-primary) !important;
  border-color: var(--c-primary) !important;
}

.btn--outline:hover,
.btn--outline:focus-visible {
  background: var(--c-primary) !important;
  color: var(--c-white) !important;
}

.btn--white {
  background: var(--c-white) !important;
  color: var(--c-primary) !important;
  border-color: var(--c-white) !important;
}

.btn--white:hover,
.btn--white:focus-visible {
  background: var(--c-primary-light) !important;
  color: var(--c-primary-dark) !important;
  border-color: var(--c-primary-light) !important;
}

.btn--lg {
  padding: .8rem 2rem;
  font-size: 1rem;
}

/* ==========================================
   TOPBAR
   ========================================== */
.topbar {
  background: #f1f5f9;
  color: var(--c-dark);
  font-size: .875rem;
  line-height: var(--topbar-h);
  height: var(--topbar-h);
  border-bottom: 1px solid #e2e8f0;
}

.topbar .container,
.site-header .container {
  max-width: 100% !important;
  padding-right: .75rem;
  padding-left: .75rem;
}

.topbar__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.topbar__left,
.topbar__right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.topbar__link {
  color: var(--c-dark);
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  font-size: .875rem;
  font-weight: 500;
  transition: color var(--transition);
}

.topbar__link:hover {
  color: var(--c-primary);
}

.topbar__search-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--c-dark);
  font-size: .9375rem;
  padding: 0;
  display: inline-flex;
  align-items: center;
  transition: color var(--transition);
}

.topbar__search-btn:hover {
  color: var(--c-primary);
}

.topbar__link--nav {
  display: none;
}

.topbar__link--hide-mobile {
  display: none;
}

.topbar__link--email {
  display: none;
}

/* Mobile: phone left, social right */
.topbar__link--phone {
  display: inline-flex;
}

.topbar__link--phone-desktop {
  display: none;
}

.topbar__social {
  display: flex;
  align-items: center;
  gap: .4rem;
}

.topbar__social-link {
  color: var(--c-dark);
  font-size: 1rem;
  width: 30px;
  height: 30px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: all var(--transition);
}

.topbar__social-link:hover {
  color: var(--c-primary);
  background: var(--c-primary-light);
}

/* ==========================================
   HEADER & NAVBAR
   ========================================== */
.site-header {
  background: var(--c-white);
  height: var(--header-h);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow-sm);
}

.site-header__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
  gap: 1rem;
}

.site-header__logo img {
  height: 36px;
  width: auto;
}

.site-header__badges {
  display: none;
  align-items: center;
  gap: .5rem;
  flex-shrink: 0;
}

.site-header__badge-img {
  height: 48px;
  width: auto;
}

.site-header__ataturk-img {
  height: 52px;
  width: auto;
  border-radius: var(--radius-sm);
}

/* Hamburger */
.main-nav__toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: none;
  border: 2px solid var(--c-gray-light);
  cursor: pointer;
  padding: 0;
  z-index: 1100;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.main-nav__toggle:hover {
  background: var(--c-light);
  border-color: var(--c-primary);
}

.main-nav__hamburger,
.main-nav__hamburger::before,
.main-nav__hamburger::after {
  display: block;
  width: 22px;
  height: 2.5px;
  background: var(--c-dark);
  border-radius: 2px;
  transition: all var(--transition);
}

.main-nav__hamburger {
  position: relative;
}

.main-nav__hamburger::before,
.main-nav__hamburger::after {
  content: '';
  position: absolute;
  left: 0;
}

.main-nav__hamburger::before { top: -7px; }
.main-nav__hamburger::after  { top:  7px; }

.main-nav__toggle[aria-expanded="true"] .main-nav__hamburger {
  background: transparent;
}

.main-nav__toggle[aria-expanded="true"] .main-nav__hamburger::before {
  top: 0;
  transform: rotate(45deg);
}

.main-nav__toggle[aria-expanded="true"] .main-nav__hamburger::after {
  top: 0;
  transform: rotate(-45deg);
}

/* Mobile menu */
.main-nav__list {
  position: fixed;
  top: var(--header-h);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--c-white);
  flex-direction: column;
  padding: 1rem;
  display: flex;
  transform: translateX(100%);
  transition: transform var(--transition);
  overflow-y: auto;
  z-index: 1050;
  gap: .125rem;
}

.main-nav__list.is-open {
  transform: translateX(0);
}

.main-nav__link {
  display: flex;
  align-items: center;
  gap: .5rem;
  padding: .75rem 1rem;
  color: var(--c-dark);
  font-weight: var(--fw-medium);
  font-size: .9375rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

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

.main-nav__arrow {
  font-size: .625rem;
  margin-left: auto;
  transition: transform var(--transition);
  color: var(--c-gray);
}

/* Dropdown */
.main-nav__dropdown {
  display: none;
  padding-left: 1rem;
}

.main-nav__item--dropdown.is-open .main-nav__dropdown {
  display: block;
}

.main-nav__item--dropdown.is-open .main-nav__arrow {
  transform: rotate(180deg);
}

.main-nav__dropdown-link {
  display: block;
  padding: .5rem 1rem;
  color: var(--c-gray);
  font-size: .875rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  border-left: 2px solid var(--c-gray-light);
}

.main-nav__dropdown-link:hover {
  color: var(--c-primary);
  background: var(--c-primary-light);
  border-left-color: var(--c-primary);
}

/* ==========================================
   FOOTER
   ========================================== */
.site-footer {
  background: #0072BC;
  color: rgba(255,255,255,.8);
  padding: 3rem 0 0;
  margin-bottom: calc(-1 * var(--bottom-menu-h));
  padding-bottom: var(--bottom-menu-h);
  font-size: .9375rem;
}

/* Brand area (logo + about + social) */
.site-footer__brand {
  text-align: center;
  margin-bottom: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid rgba(255,255,255,.12);
}

.site-footer__logo {
  margin: 0 auto;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.site-footer__col--contact {
  grid-column: 1 / -1;
  text-align: center;
}

.site-footer__col--contact .site-footer__heading::after {
  left: 50%;
  transform: translateX(-50%);
}

.site-footer__col--contact .site-footer__contact p {
  justify-content: center;
}

.site-footer__about {
  margin-top: 1rem;
  font-size: .9375rem;
  line-height: 1.7;
  color: rgba(255,255,255,.85);
}

.site-footer__social {
  display: flex;
  gap: .5rem;
  margin-top: 1.25rem;
  justify-content: center;
}

.site-footer__social a {
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,.08);
  color: rgba(255,255,255,.7);
  font-size: .875rem;
  transition: all var(--transition);
}

.site-footer__social a:hover {
  background: var(--c-accent);
  color: var(--c-white);
  transform: translateY(-2px);
}

.site-footer__heading {
  color: var(--c-white);
  font-size: 1rem;
  font-weight: var(--fw-semibold);
  margin-bottom: 1rem;
  position: relative;
  padding-bottom: .75rem;
}

.site-footer__heading::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--c-accent);
  border-radius: 1px;
}

.site-footer__links li + li {
  margin-top: .5rem;
}

.site-footer__links {
  padding-left: 0;
}

.site-footer__links a {
  color: rgba(255,255,255,.8);
  font-size: .9375rem;
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
  gap: .35rem;
}

.site-footer__links a::before {
  content: '';
  width: 0;
  height: 1px;
  background: var(--c-accent);
  transition: width var(--transition);
}

.site-footer__links a:hover {
  color: var(--c-white);
}

.site-footer__links a:hover::before {
  width: 12px;
}

.site-footer__contact {
  font-style: normal;
  font-size: .875rem;
}

.site-footer__contact p {
  display: flex;
  align-items: flex-start;
  gap: .5rem;
  margin-bottom: .75rem;
}

.site-footer__contact a {
  color: rgba(255,255,255,.85);
}

.site-footer__contact a:hover {
  color: var(--c-white);
}

.site-footer__contact i {
  color: var(--c-accent);
  margin-top: .25rem;
  flex-shrink: 0;
  width: 16px;
  text-align: center;
}

.site-footer__bottom {
  margin-top: 2.5rem;
  padding: 1.25rem 0;
  border-top: 1px solid rgba(255,255,255,.1);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .75rem;
  text-align: center;
  font-size: .8125rem;
  color: rgba(255,255,255,.5);
}

.site-footer__legal {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

.site-footer__legal a {
  color: rgba(255,255,255,.5);
  font-size: .8125rem;
}

.site-footer__legal a:hover {
  color: var(--c-white);
}

/* ==========================================
   BACK TO TOP
   ========================================== */
.back-to-top {
  position: fixed;
  bottom: calc(var(--bottom-menu-h) + 1rem);
  right: 1rem;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--c-primary);
  color: var(--c-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition);
  z-index: 900;
  opacity: 0;
  visibility: hidden;
}

.back-to-top:not([hidden]) {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--c-accent);
  color: var(--c-white);
  transform: translateY(-3px);
}

/* ==========================================
   BOTTOM MENU (Mobile/Tablet)
   ========================================== */
.bottom-menu {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--bottom-menu-h);
  background: var(--c-white);
  display: flex;
  align-items: stretch;
  justify-content: space-around;
  box-shadow: 0 -2px 16px rgba(0,0,0,.08);
  z-index: 1100;
  padding-bottom: env(safe-area-inset-bottom, 0);
}

.bottom-menu__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1;
  color: var(--c-gray);
  font-size: .6875rem;
  font-weight: var(--fw-medium);
  gap: .2rem;
  transition: color var(--transition);
  text-decoration: none;
  border: none;
  background: none;
  cursor: pointer;
  min-width: 0;
  position: relative;
}

.bottom-menu__item i {
  font-size: 1.125rem;
}

.bottom-menu__item span {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}

.bottom-menu__item--active {
  color: var(--c-primary);
}

.bottom-menu__item--active::before {
  content: '';
  position: absolute;
  top: 0;
  left: 25%;
  right: 25%;
  height: 2px;
  background: var(--c-primary);
  border-radius: 0 0 2px 2px;
}

.bottom-menu__item--kampus.bottom-menu__item--active::before {
  display: none;
}

.bottom-menu__item--call {
  color: var(--c-success);
}

.bottom-menu__item--kampus {
  color: var(--c-white);
  background: var(--c-accent);
  border-radius: var(--radius-md);
  margin: .5rem .25rem;
  flex: 1.1;
  font-weight: var(--fw-semibold);
}

.bottom-menu__item--kampus:hover {
  color: var(--c-white);
  background: var(--c-accent-dark);
}

.bottom-menu__item:hover:not(.bottom-menu__item--kampus) {
  color: var(--c-primary);
}

/* ==========================================
   BREAKPOINTS
   ========================================== */

/* -- Normal mobile (480px+) -- */
@media (min-width: 480px) {
  .topbar__link--email {
    display: inline-flex;
  }

  .topbar__link--nav {
    display: inline-flex;
  }

  .topbar__link--phone {
    display: none;
  }

  .topbar__link--phone-desktop {
    display: inline-flex;
  }

  .bottom-menu__item {
    font-size: .75rem;
  }

  .bottom-menu__item i {
    font-size: 1.25rem;
  }
}

/* -- Tablet (768px+) -- */
@media (min-width: 768px) {
  :root {
    --header-h: 72px;
    --topbar-h: 40px;
  }

  .topbar .container,
  .site-header .container {
    padding-right: 1.5rem;
    padding-left: 1.5rem;
  }

  .topbar__link--hide-mobile {
    display: inline-flex;
  }

  .site-header__logo img {
    height: 38px;
  }

  .site-header__badges {
    display: flex;
  }

  .site-header__badge-img {
    height: 36px;
  }

  .site-header__ataturk-img {
    height: 36px;
  }

  .site-footer__brand {
    text-align: left;
  }

  .site-footer__logo {
    margin: 0;
  }

  .site-footer__social {
    justify-content: flex-start;
  }

  .site-footer__grid {
    grid-template-columns: 1fr 1fr 1fr;
  }

  .site-footer__col--contact {
    grid-column: auto;
    text-align: left;
  }

  .site-footer__col--contact .site-footer__heading::after {
    left: 0;
    transform: none;
  }

  .site-footer__col--contact .site-footer__contact p {
    justify-content: flex-start;
  }

  .site-footer__bottom {
    flex-direction: row;
    justify-content: space-between;
  }
}

/* -- Desktop (1200px+) -- */
@media (min-width: 1200px) {
  :root {
    --header-h: 72px;
    --bottom-menu-h: 0px;
  }

  body {
    padding-bottom: 0;
  }

  /* Hide mobile elements */
  .bottom-menu {
    display: none;
  }

  .main-nav__toggle {
    display: none;
  }

  /* Desktop nav */
  .main-nav {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
  }

  .main-nav__list {
    position: static;
    flex-direction: row;
    transform: none;
    padding: 0;
    margin: 0;
    background: transparent;
    align-items: center;
    gap: 0;
    overflow: visible;
  }

  .main-nav__link {
    padding: .5rem .7rem;
    font-size: .875rem;
  }

  .main-nav__arrow {
    margin-left: .25rem;
  }

  /* Desktop dropdown */
  .main-nav__item--dropdown {
    position: relative;
  }

  .main-nav__dropdown {
    display: none;
    position: absolute;
    top: calc(100% + 4px);
    left: 50%;
    transform: translateX(-50%);
    min-width: 220px;
    background: var(--c-white);
    box-shadow: var(--shadow-xl);
    border-radius: var(--radius-md);
    padding: .5rem;
    z-index: 1100;
    border: 1px solid var(--c-gray-light);
  }

  .main-nav__item--dropdown:hover .main-nav__dropdown,
  .main-nav__item--dropdown.is-open .main-nav__dropdown {
    display: block;
  }

  .main-nav__dropdown-link {
    padding: .5rem .75rem;
    border-left: none;
    border-radius: var(--radius-sm);
  }

  .main-nav__dropdown-link:hover {
    border-left-color: transparent;
  }

  .site-header__logo img {
    height: 42px;
  }

  .site-header__badge-img {
    height: 42px;
  }

  .site-header__ataturk-img {
    height: 42px;
  }

  /* Footer desktop */
  .site-footer__brand {
    display: flex;
    align-items: center;
    gap: 2rem;
    text-align: left;
  }

  .site-footer__brand .site-footer__about {
    margin-top: 0;
    flex: 1;
  }

  .site-footer__brand .site-footer__social {
    margin-top: 0;
  }

  .site-footer__grid {
    grid-template-columns: 1fr 1fr 1.5fr;
  }

  /* Back to top: no bottom menu offset */
  .back-to-top {
    bottom: 2rem;
  }
}