:root {
  color-scheme: light dark;

  /* ===== LIGHT (mặc định) ===== */
  --bg: 249 250 251;              /* nền ngoài */
  --bg-accent: 224 231 255;       /* tím nhạt */
  --bg-accent-2: 219 234 254;     /* xanh nhạt */

  --card: 255 255 255;            /* khung chính */
  --fg: 15 23 42;                 /* chữ */
  --muted: 100 116 139;

  --primary: 79 70 229;           /* tím */
  --primary-2: 59 130 246;        /* xanh */

  --input: 248 250 252;
  --input-border: 209 213 219;

  --glass: 255 255 255;
  --glass-border: 209 213 219;

  --seg-bg: 255 255 255;
  --seg-border: 226 232 240;
  --seg-shadow: 0 10px 25px rgba(15, 23, 42, .08);
}

/* ===== LIGHT mode cưỡng bức ===== */
[data-theme="light"] {
  --bg: 249 250 251;
  --bg-accent: 224 231 255;
  --bg-accent-2: 219 234 254;

  --card: 255 255 255;
  --fg: 15 23 42;
  --muted: 100 116 139;

  --primary: 79 70 229;
  --primary-2: 59 130 246;

  --input: 248 250 252;
  --input-border: 209 213 219;

  --glass: 255 255 255;
  --glass-border: 209 213 219;

  --seg-bg: 255 255 255;
  --seg-border: 226 232 240;
  --seg-shadow: 0 10px 25px rgba(15, 23, 42, .08);
}

/* ===== DARK mode cưỡng bức ===== */
[data-theme="dark"] {
  --bg: 8 15 32;
  --bg-accent: 129 140 248;
  --bg-accent-2: 96 165 250;

  --card: 12 20 40;
  --fg: 241 245 249;
  --muted: 148 163 184;

  --primary: 129 140 248;
  --primary-2: 96 165 250;

  --input: 22 30 55;
  --input-border: 71 85 105;

  --glass: 15 23 42;
  --glass-border: 148 163 184;

  --seg-bg: 15 23 42;
  --seg-border: 71 85 105;
  --seg-shadow: 0 18px 35px rgba(0, 0, 0, .5);
}

/* ===== AUTO: theo system, ưu tiên dark nếu hệ thống dark ===== */
@media (prefers-color-scheme: dark) {
  [data-theme="auto"] {
    --bg: 8 15 32;
    --bg-accent: 129 140 248;
    --bg-accent-2: 96 165 250;

    --card: 12 20 40;
    --fg: 241 245 249;
    --muted: 148 163 184;

    --primary: 129 140 248;
    --primary-2: 96 165 250;

    --input: 22 30 55;
    --input-border: 71 85 105;

    --glass: 15 23 42;
    --glass-border: 148 163 184;

    --seg-bg: 15 23 42;
    --seg-border: 71 85 105;
    --seg-shadow: 0 18px 35px rgba(0, 0, 0, .5);
  }
}

* {
  box-sizing: border-box;
}
html, body {
  height: 100%;
}
body {
  margin: 0;
  font-family: 'Montserrat', system-ui, -apple-system, Segoe UI, Roboto, 'Helvetica Neue', Arial, sans-serif;
  background:
    radial-gradient(circle at top left, rgba(var(--bg-accent) / 0.55), transparent 55%),
    radial-gradient(circle at bottom right, rgba(var(--bg-accent-2) / 0.50), transparent 55%),
    rgb(var(--bg));
  color: rgb(var(--fg));
  display: grid;
  place-items: center;
  min-height: 100dvh;
}

.wrap {
  width: min(960px, 100%);
  padding: 16px;
}

/* Top bar */
.topbar {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  margin-bottom: 10px;
}

.seg {
  display: flex;
  border: 1px solid rgb(var(--seg-border));
  background: rgba(var(--seg-bg) / 0.96);
  border-radius: 999px;
  padding: 4px;
  box-shadow: var(--seg-shadow);
  backdrop-filter: blur(16px);
}

.seg button {
  appearance: none;
  border: none;
  background: transparent;
  color: rgb(var(--muted));
  padding: 8px 12px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
}

.seg button[aria-pressed="true"] {
  background: linear-gradient(90deg, rgb(var(--primary-2)), rgb(var(--primary)));
  color: #fff;
}

/* Container chính */
.container {
  position: relative;
  overflow: hidden;
  background: rgba(var(--card) / 0.98);
  border: 1px solid rgba(var(--glass-border) / 0.18);
  border-radius: 28px;
  box-shadow: 0 22px 45px rgba(15, 23, 42, .25);
  width: 100%;
  min-height: 560px;
}

/* Mobile tabs (ẩn desktop) */
.mobile-tabs {
  display: none;
}

/* Form */
.form-container {
  position: absolute;
  top: 0;
  height: 100%;
  transition: all .6s ease-in-out;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 50%;
  padding: 20px;
}

.form {
  width: min(420px, 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 0 12px;
}

.form h1 {
  margin: 0 0 6px;
  font-size: clamp(22px, 3.6vw, 34px);
  letter-spacing: 0.03em;
}

.form p {
  margin: 10px 0 16px;
  color: rgb(var(--muted));
  font-size: 14px;
  line-height: 1.5;
}

.inputs {
  width: 100%;
}

/* Input style glass */
.inputs input {
  width: 100%;
  border: 1px solid rgba(var(--input-border) / 0.7);
  background:
    radial-gradient(circle at top left, rgba(var(--glass-border) / 0.18), rgba(var(--glass) / 0.96));
  color: rgb(var(--fg));
  border-radius: 18px;
  padding: 14px 16px;
  margin: 8px 0;
  font-size: 14px;
  outline: none;
}

.inputs input::placeholder {
  color: rgba(var(--muted) / 0.75);
}

.inputs input:focus {
  box-shadow: 0 0 0 2px rgba(var(--primary) / .45);
  border-color: rgba(var(--primary) / .9);
}

/* Button */
.btn {
  background: linear-gradient(90deg, rgb(var(--primary)), rgb(var(--primary-2)));
  color: #fff;
  border: none;
  border-radius: 18px;
  padding: 12px 18px;
  font-weight: 700;
  letter-spacing: .7px;
  text-transform: uppercase;
  margin-top: 12px;
  cursor: pointer;
  width: 100%;
  min-height: 46px;
  font-size: 13px;
}

.btn.secondary {
  background: transparent;
  border: 1px solid #fff;
  color: #fff;
}

/* Social icons */
.social {
  display: flex;
  gap: 10px;
  margin: 14px 0;
}

.social a {
  width: 46px;
  height: 46px;
  border-radius: 16px;
  border: 1px solid rgba(var(--glass-border) / 0.7);
  display: grid;
  place-items: center;
  background:
    radial-gradient(circle at top left, rgba(var(--glass-border) / 0.18), rgba(var(--glass) / 0.96));
  color: rgb(var(--fg));
  text-decoration: none;
}

/* Vị trí form (desktop logic) */
.sign-in {
  left: 0;
  z-index: 2;
}

.sign-up {
  left: 0;
  opacity: 0;
  z-index: 1;
  display: none;          /* mặc định ẩn Sign Up */
}

/* Khi container.active: hiển thị Sign Up, ẩn Sign In */
.container.active .sign-in {
  transform: translateX(100%);
  display: none;
}

.container.active .sign-up {
  transform: translateX(100%);
  opacity: 1;
  z-index: 5;
  display: flex;
  animation: fadeIn .6s both;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* Curtain (desktop) */
.toggle-container {
  position: absolute;
  top: 0;
  left: 50%;
  width: 50%;
  height: 100%;
  overflow: hidden;
  transition: all .6s ease-in-out;
  border-radius: 180px 0 0 180px;
  z-index: 10;
}

.container.active .toggle-container {
  transform: translateX(-100%);
  border-radius: 0 180px 180px 0;
}

.toggle {
  position: relative;
  left: -100%;
  width: 200%;
  height: 100%;
  background: linear-gradient(130deg, rgb(var(--primary)), rgb(var(--primary-2)));
  color: #fff;
  transition: all .6s ease-in-out;
  display: flex;
}

.container.active .toggle {
  transform: translateX(50%);
}

.toggle-panel {
  position: absolute;
  top: 0;
  width: 50%;
  height: 100%;
  display: grid;
  place-items: center;
  padding: 22px;
  text-align: center;
}

.toggle-panel h1 {
  font-size: clamp(22px, 4vw, 34px);
  margin: 0 0 8px;
}

.toggle-panel p {
  opacity: .97;
  max-width: 34ch;
  font-size: 14px;
}

.toggle-left {
  transform: translateX(-200%);
}
.container.active .toggle-left {
  transform: translateX(0);
}

.toggle-right {
  right: 0;
}
.container.active .toggle-right {
  transform: translateX(200%);
}

/* Links */
.link {
  color: rgb(var(--muted));
  text-decoration: none;
  font-size: 13px;
  display: inline-block;
  margin-top: 10px;
}

/* Screen reader only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* ===== OTP BOX ===== */
.otp-box {
  display: flex;
  gap: 10px;
  justify-content: center;
  margin: 20px 0;
}
.otp-box input {
  width: 48px;
  height: 48px;
  font-size: 22px;
  text-align: center;
  border-radius: 14px;
}

/* ===== RECOVERY FLOW (FORGOT / OTP / RESET) ===== */
.form-container.recovery {
  left: 0;
  opacity: 0;
  z-index: 1;
  display: none;
}

/* Hiển thị từng màn recovery */
.container.show-forgot .forgot,
.container.show-otp .otp,
.container.show-reset .reset {
  display: flex;
  opacity: 1;
  z-index: 5;
  position: relative;
  width: 100%;
  height: 100%;
  animation: fadeIn .4s both;
}

/* Ẩn login / signup khi ở chế độ recovery */
.container.show-forgot .sign-in,
.container.show-forgot .sign-up,
.container.show-otp .sign-in,
.container.show-otp .sign-up,
.container.show-reset .sign-in,
.container.show-reset .sign-up {
  display: none;
}

/* Ẩn curtain / mobile-tabs khi ở chế độ recovery */
.container.show-forgot .toggle-container,
.container.show-otp .toggle-container,
.container.show-reset .toggle-container {
  display: none;
}
.container.show-forgot .mobile-tabs,
.container.show-otp .mobile-tabs,
.container.show-reset .mobile-tabs {
  display: none;
}

/* ==== TUNE LẠI LAYOUT CHO FORGOT / OTP / RESET ==== */
.container.show-forgot,
.container.show-otp,
.container.show-reset {
  min-height: 420px;
  padding-top: 32px;
  padding-bottom: 32px;
}

.container.show-forgot .form-container.recovery,
.container.show-otp .form-container.recovery,
.container.show-reset .form-container.recovery {
  position: relative;
  width: 100%;
  height: auto;
  align-items: flex-start;
  justify-content: center;
}

.container.show-forgot .form,
.container.show-otp .form,
.container.show-reset .form {
  max-width: 520px;
  padding: 40px 32px 32px;
}

.container.show-forgot .form h1,
.container.show-otp .form h1,
.container.show-reset .form h1 {
  font-size: 32px;
}

.container.show-forgot .form p,
.container.show-otp .form p,
.container.show-reset .form p {
  font-size: 15px;
  margin-bottom: 20px;
}

/* ===== TOAST (card trắng, viền xanh) ===== */
.toast-wrap {
  position: fixed;
  right: 16px;
  top: 16px;
  z-index: 999;
  display: grid;
  gap: 8px;
}

.toast {
  min-width: 260px;
  max-width: 420px;
  border-radius: 16px;
  padding: 10px 14px;
  font-size: 13px;
  line-height: 1.4;
  border: 1px solid;
  background: rgb(var(--card));
  display: flex;
  align-items: center;
  gap: 10px;
  box-shadow: 0 14px 30px rgba(15, 23, 42, .12);
  animation: toast-in .18s ease-out;
  color: rgb(var(--fg));
}

/* icon tròn bên trái */
.toast-icon {
  width: 26px;
  height: 26px;
  border-radius: 999px;
  border: 2px solid currentColor;
  display: grid;
  place-items: center;
  font-size: 14px;
}

.toast-body {
  flex: 1;
}

.toast-title {
  font-weight: 600;
  font-size: 13px;
  margin-bottom: 2px;
}

.toast-text {
  font-size: 12px;
  color: rgb(var(--muted));
}

/* màu từng loại */
.toast-ok {
  border-color: rgba(74, 222, 128, .6);      /* xanh lá nhạt */
}

.toast-err {
  border-color: rgba(248, 113, 113, .7);      /* đỏ nhạt */
}

.toast-close {
  border: none;
  background: transparent;
  cursor: pointer;
  font-size: 16px;
  opacity: .55;
  padding: 0 2px;
}

.toast-close:hover {
  opacity: 1;
}

/* ===== TOGGLE PASSWORD (ADDED) ===== */
.pass-group {
    position: relative;
    width: 100%;
}

.pass-group input {
    padding-right: 42px;
}

.toggle-pass {
    position: absolute;
    right: 14px;
    top: 50%;
    transform: translateY(-50%);
    cursor: pointer;
    font-size: 18px;
    opacity: .45;
    transition: .25s ease;
}

.toggle-pass:hover {
    opacity: 1;
}

.toggle-pass:active {
    transform: translateY(-50%) scale(1.15);
}


@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateY(-6px) translateX(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0) translateX(0);
  }
}

/* ===== MOBILE ===== */
@media (max-width: 720px) {
  body {
    display: block;
    min-height: 100dvh;
  }

  .wrap {
    width: 100%;
    padding: 0;
  }

  .topbar {
    padding: 8px 12px 0;
    margin-bottom: 8px;
    justify-content: space-between;
  }

  .container {
    border-radius: 24px 24px 0 0;
    min-height: calc(100dvh - 60px);
    padding-top: 52px; /* chừa chỗ cho tabs login/signup */
    margin: 0;
    box-shadow: 0 -6px 30px rgba(15, 23, 42, .25);
  }

  .container.show-forgot,
  .container.show-otp,
  .container.show-reset {
    padding-top: 24px;
    min-height: calc(100dvh - 60px);
    border-radius: 24px 24px 0 0;
  }

  /* Tabs on mobile (cho login/signup) */
  .mobile-tabs {
    position: absolute;
    top: 6px;
    left: 12px;
    right: 12px;
    display: flex;
    margin: 0;
    padding: 4px;
    border-radius: 999px;
    background: rgba(var(--seg-bg) / 0.96);
    border: 1px solid rgba(var(--seg-border) / 0.8);
    gap: 4px;
    z-index: 20;
    backdrop-filter: blur(14px);
  }

  .mobile-tab {
    flex: 1;
    border: none;
    background: transparent;
    color: rgba(var(--muted) / 0.95);
    border-radius: 999px;
    padding: 8px 10px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
  }

  .mobile-tab[aria-selected="true"] {
    background: linear-gradient(90deg, rgb(var(--primary)), rgb(var(--primary-2)));
    color: #fff;
  }

  .form-container {
    position: relative;
    width: 100%;
    height: auto;
    padding: 24px 18px 26px;
  }

  /* Ẩn curtain trên mobile */
  .toggle-container {
    display: none;
  }

  .container.active .sign-in,
  .container.active .sign-up {
    transform: none;
  }

  .sign-up {
    opacity: 1;
    z-index: 1;
    display: none;
  }

  .container.active .sign-in {
    display: false;
  }

  .container.active .sign-up {
    display: flex;
  }

  /* Recovery form trên mobile gọn hơn */
  .container.show-forgot .form,
  .container.show-otp .form,
  .container.show-reset .form {
    max-width: 500px;
    padding: 32px 20px 28px;
  }

  /* OTP box nhỏ hơn một chút trên mobile */
  .otp-box {
    gap: 6px;
  }
  .otp-box input {
    width: 42px;
    height: 42px;
    font-size: 20px;
  }

  /* Toast full chiều ngang nhưng chừa mép */
  .toast-wrap {
    right: 10px;
    left: 10px;
  }
  .toast {
    max-width: 100%;
  }
}