@font-face {
  font-family: Vazir;
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("assets/fonts/vazir-400.woff2") format("woff2");
}

@font-face {
  font-family: Vazir;
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("assets/fonts/vazir-700.woff2") format("woff2");
}

:root {
  --font: Vazir, sans-serif;
  --surface: #fafaf9;
  --ink: #1c1917;
  --muted: #78716c;
  --line: #e7e5e4;
  --brand: #0d9488;
  --brand-dark: #0f766e;
  --brand-400: #2dd4bf;
  --brand-800: #115e59;
  --brand-900: #134e4a;
  --danger: #dc2626;
  --radius: 0.75rem;
  --shadow: 0 12px 40px rgb(28 25 23 / 0.08);
}

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

html {
  font-family: var(--font);
}

body {
  margin: 0;
  min-height: 100dvh;
  color: var(--ink);
  background: var(--surface);
}

a {
  color: var(--brand-dark);
  font-weight: 600;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.page {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1.5rem 1rem;
  background:
    radial-gradient(ellipse 80% 50% at 100% 0%, rgb(204 251 241 / 0.55), transparent),
    radial-gradient(ellipse 60% 40% at 0% 100%, rgb(240 253 250 / 0.8), transparent),
    var(--surface);
}

.card {
  display: grid;
  width: 100%;
  max-width: 52rem;
  overflow: hidden;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 1.25rem;
  box-shadow: var(--shadow);
}

.card__side {
  display: none;
  position: relative;
  flex-direction: column;
  justify-content: space-between;
  padding: 2.5rem;
  color: #fff;
  overflow: hidden;
  background: linear-gradient(165deg, var(--brand-800) 0%, var(--brand-900) 48%, #0c4a44 100%);
}

.card__side::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.07;
  background-image: radial-gradient(circle, #fff 1px, transparent 1px);
  background-size: 20px 20px;
  pointer-events: none;
}

.card__side-top,
.card__features {
  position: relative;
}

.card__icon {
  width: 3.5rem;
  height: 3.5rem;
  display: grid;
  place-items: center;
  margin-bottom: 2rem;
  border-radius: 1rem;
  background: rgb(255 255 255 / 0.1);
  box-shadow: inset 0 0 0 1px rgb(255 255 255 / 0.2);
}

.card__icon svg {
  width: 1.75rem;
  height: 1.75rem;
}

.card__title {
  margin: 0;
  max-width: 14rem;
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.02em;
}

.card__text {
  margin: 1rem 0 0;
  max-width: 16rem;
  font-size: 0.875rem;
  line-height: 1.75;
  color: rgb(204 251 241 / 0.85);
}

.card__features {
  margin: 2.5rem 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  font-size: 0.875rem;
  color: rgb(240 253 250 / 0.9);
}

.card__features li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.feature-dot {
  width: 0.375rem;
  height: 0.375rem;
  flex-shrink: 0;
  border-radius: 999px;
  background: var(--brand-400);
  box-shadow: 0 0 0 4px rgb(45 212 191 / 0.35);
}

.card__main {
  padding: 1.5rem;
}

/* تب — فقط CSS */
.tab-input {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.25rem;
  margin-bottom: 1.5rem;
  padding: 0.25rem;
  background: #f5f5f4;
  border-radius: var(--radius);
}

.tab {
  padding: 0.6rem 1rem;
  border-radius: calc(var(--radius) - 2px);
  font-size: 0.875rem;
  font-weight: 600;
  text-align: center;
  color: var(--muted);
  cursor: pointer;
  transition: background 0.2s, color 0.2s, box-shadow 0.2s;
}

#tab-login:checked ~ .tabs label[for="tab-login"],
#tab-register:checked ~ .tabs label[for="tab-register"] {
  background: #fff;
  color: var(--ink);
  box-shadow: 0 1px 3px rgb(28 25 23 / 0.08);
}

.form {
  display: none;
  flex-direction: column;
  gap: 1rem;
}

#tab-login:checked ~ .form--login,
#tab-register:checked ~ .form--register {
  display: flex;
}

.form__title {
  margin: 0;
  font-size: 1.5rem;
}

.form__lead {
  margin: 0 0 0.25rem;
  font-size: 0.875rem;
  color: var(--muted);
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.field__label {
  font-size: 0.8125rem;
  font-weight: 600;
}

.field input {
  width: 100%;
  padding: 0.7rem 0.85rem;
  border: 1.5px solid var(--line);
  border-radius: var(--radius);
  background: #fafaf9;
  font: inherit;
  font-size: 0.9rem;
  color: var(--ink);
  transition: border-color 0.15s, box-shadow 0.15s;
}

.field input:focus {
  outline: none;
  border-color: var(--brand);
  background: #fff;
  box-shadow: 0 0 0 3px rgb(20 184 166 / 0.2);
}

.field--error input {
  border-color: var(--danger);
  background: #fffbfb;
}

.field__error {
  font-size: 0.75rem;
  color: var(--danger);
}

.form__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  font-size: 0.875rem;
}

.check {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  color: #57534e;
}

.check--block {
  align-items: flex-start;
  line-height: 1.6;
}

.check input {
  width: 1rem;
  height: 1rem;
  accent-color: var(--brand);
}

.btn {
  margin-top: 0.25rem;
  width: 100%;
  padding: 0.75rem 1rem;
  border: none;
  border-radius: var(--radius);
  background: var(--brand);
  color: #fff;
  font: inherit;
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}

.btn:hover {
  background: var(--brand-dark);
}

.form__note {
  margin: 0;
  font-size: 0.75rem;
  color: var(--muted);
  text-align: center;
}

.switch {
  margin: 1.25rem 0 0;
  font-size: 0.875rem;
  text-align: center;
  color: var(--muted);
}

.switch--register {
  display: none;
}

#tab-register:checked ~ .switch--login {
  display: none;
}

#tab-register:checked ~ .switch--register {
  display: block;
}

.switch__link {
  color: var(--brand-dark);
  font-weight: 600;
  cursor: pointer;
}

.switch__link:hover {
  text-decoration: underline;
}

.footer {
  margin-top: 1.5rem;
  font-size: 0.75rem;
  color: #a8a29e;
}

@media (min-width: 48rem) {
  .card {
    grid-template-columns: 0.95fr 1.05fr;
    min-height: 36rem;
  }

  .card__side {
    display: flex;
  }

  .card__main {
    padding: 2rem 2.25rem;
  }
}