/* Login page — style/login.css*/

/* Font (giữ Poppins như cũ) */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;600&display=swap');

/* ============== THEME TOKENS ============== */
/* Light (mặc định) */
:root{
  /* Page */
  --page-bg: #f0f2f5;
  --text: #1f2937;             /* slate-800 */
  --text-strong: #111827;      /* slate-900 */
  --text-muted: #555555;

  /* Card / Login box */
  --card-bg: #ffffff;
  --card-border: rgba(0,0,0,0.1);
  --card-shadow-1: 0 15px 30px rgba(0,0,0,0.08), 0 5px 10px rgba(0,0,0,0.05);
  --card-shadow-1-hover: 0 20px 40px rgba(0,0,0,0.12), 0 8px 15px rgba(0,0,0,0.08);

  /* Inputs */
  --input-bg: #f9f9f9;
  --input-border: #e0e0e0;
  --input-text: #333333;
  --placeholder: #999999;
  --focus-border: #8bc34a;
  --focus-ring: rgba(139,195,74,0.3);

  /* Button (green gradient) */
  --btn-grad-a: #8BC34A;
  --btn-grad-b: #A3D76F;
  --btn-shadow: 0 5px 15px rgba(0,0,0,0.1);
  --btn-shadow-hover: 0 8px 20px rgba(0,0,0,0.15);

  /* Overlay/backdrop for glassmorphism */
  --backdrop-blur: 10px;
}

/* Dark (tự động) */
@media (prefers-color-scheme: dark){
  :root{
    --page-bg: #0b0f14;
    --text: #e5e7eb;             /* gray-200 */
    --text-strong: #f3f4f6;
    --text-muted: #cbd5e1;

    --card-bg: #0f141a;
    --card-border: rgba(255,255,255,0.08);
    --card-shadow-1: 0 18px 36px rgba(0,0,0,0.5), 0 8px 16px rgba(0,0,0,0.35);
    --card-shadow-1-hover: 0 28px 56px rgba(0,0,0,0.6), 0 10px 22px rgba(0,0,0,0.45);

    --input-bg: #0f141a;
    --input-border: #263040;
    --input-text: #e5e7eb;
    --placeholder: #9aa4b2;
    --focus-border: #86efac;                 /* green-300 */
    --focus-ring: rgba(134,239,172,0.28);

    /* Làm gradient dịu hơn trong Dark để đọc tốt */
    --btn-grad-a: #34d399;                   /* green-400 */
    --btn-grad-b: #22c55e;                   /* green-500 */
    --btn-shadow: 0 6px 16px rgba(0,0,0,0.45);
    --btn-shadow-hover: 0 10px 24px rgba(0,0,0,0.55);

    --backdrop-blur: 10px;                   /* giữ blur */
  }
}

/* ============== LAYOUT ============== */
body {
  font-family: 'Poppins', sans-serif;
 /* background: url('../img/background_login.jpg') no-repeat center center fixed;
  background-size: cover; */
  color: var(--text);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  margin: 0;
  overflow: hidden;
}


/* ============== LOGIN BOX ============== */
.login-box {
  background: var(--card-bg);
  padding: 30px;
  border-radius: 20px;
  width: 350px;
  max-width: 90%;
  max-height: 50%;
  position: relative;
  z-index: 1;

  /* Glassmorphism (nếu nền phía sau có ảnh/hoa văn sẽ thấy blur) */
  backdrop-filter: blur(var(--backdrop-blur));
  -webkit-backdrop-filter: blur(var(--backdrop-blur));
  border: 1px solid var(--card-border);

  box-shadow: var(--card-shadow-1);
  transition: transform .3s ease, box-shadow .3s ease;
}

.login-box:hover {
  transform: translateY(-5px);
  box-shadow: var(--card-shadow-1-hover);
}

.login-box h2 {
  text-align: center;
  margin-bottom: 30px;
  color: var(--text-strong);
  font-size: 2.2em;
  font-weight: 600;
  text-shadow: none;
}

/* ============== FORM ELEMENTS ============== */
.login-box label {
  display: block;
  margin-bottom: 7px;
  color: var(--text-muted);
  font-size: 1em;
  font-weight: 500;
}

.login-box input {
  width: 100%;
  padding: 12px 15px;
  margin-bottom: 30px;
  box-sizing: border-box;
  border: 1px solid var(--input-border);
  border-radius: 10px;
  background: var(--input-bg);
  color: var(--input-text);
  font-size: 1.1em;
  outline: none;
  transition: background-color .3s ease, border-color .3s ease, box-shadow .3s ease;
}

.login-box input::placeholder {
  color: var(--placeholder);
}

.login-box input:focus {
  background: var(--card-bg);
  border-color: var(--focus-border);
  box-shadow: 0 0 0 3px var(--focus-ring);
}

/* ============== BUTTON ============== */
.login-box button {
  width: 100%;
  padding: 15px;
  background: linear-gradient(45deg, var(--btn-grad-a), var(--btn-grad-b));
  color: #fff;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  font-size: 1.2em;
  font-weight: bold;
  letter-spacing: 1px;
  box-shadow: var(--btn-shadow);
  transition: transform .3s ease, box-shadow .3s ease, opacity .2s ease, filter .2s ease, background .3s ease;
}

.login-box button:hover {
  transform: translateY(-3px);
  box-shadow: var(--btn-shadow-hover);
  background: linear-gradient(45deg, var(--btn-grad-b), var(--btn-grad-a));
}

.login-box button:active {
  transform: translateY(0);
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

/* ============== ERROR MESSAGE ============== */
#login-error {
  text-align: center;
  margin-top: 15px;
  font-size: 0.95em;
  font-weight: 500;
  color: var(--btn-grad-a); /* dùng tông xanh để nổi bật nhưng thân thiện */
}