* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html,body { height: 100%; width: 100%; margin: 0; padding: 0; overflow-x: hidden; }

body{
  font-family: "YekanBakhFaNum", "Vazir", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

/* ---------- variables & themes (unchanged) ---------- */
:root{
  --primary: #005cff;
  --accent: #4da6ff;
  --bg-light: linear-gradient(135deg,#e6f0ff,#f8fbff);
  --bg-dark: radial-gradient(circle at 10% 10%, #0f172a, #020617);
  --text-light: #1e293b;
  --text-dark: #e9f0ff;
  --card-opacity: 0.72;
  --input-bg-light: rgba(255,255,255,0.95);
  --input-bg-dark: rgba(18,28,45,0.9);
  --glass-blur: 14px;
  --shadow: 0 20px 50px rgba(0,0,0,0.12);
}
[data-theme="dark"]{
  --bg: var(--bg-dark);
  --text: var(--text-dark);
  --card: rgba(26,36,55,var(--card-opacity));
  --input-bg: var(--input-bg-dark);
  --glass-blur: 10px;
  --shadow: 0 18px 40px rgba(0,0,0,0.45);
}
[data-theme]:not([data-theme="dark"]){
  --bg: var(--bg-light);
  --text: var(--text-light);
  --card: rgba(255,255,255,var(--card-opacity));
  --input-bg: var(--input-bg-light);
}

/* ---------- layout (unchanged) ---------- */
body{
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: env(safe-area-inset-top) 16px env(safe-area-inset-bottom);
  transition: background .45s ease, color .35s ease;
}
.bg-glow{
  position: fixed; inset: 0; pointer-events: none; z-index: 0;
}
.bg-glow::before{
  content:""; position:absolute; right:-20%; top:-20%; width: 60vmax; height: 60vmax;
  background: radial-gradient(circle, rgba(77,166,255,0.18) 0%, transparent 40%);
  filter: blur(90px); transition: opacity .6s ease; opacity: .9;
}
[data-theme="dark"] .bg-glow::before{
  background: radial-gradient(circle, rgba(74,163,255,0.24) 0%, transparent 35%);
  filter: blur(120px); opacity: .85;
}

/* ---------- card ---------- */
.form-container{
  position: relative; z-index: 2; width: min(92vw, 480px); max-width: 480px;
  padding: clamp(18px, 4.2vw, 36px); border-radius: 18px; background: var(--card);
  backdrop-filter: blur(var(--glass-blur)); -webkit-backdrop-filter: blur(var(--glass-blur));
  box-shadow: var(--shadow); text-align: center; transform-origin: center;
  animation: appear .6s cubic-bezier(.2,.9,.3,1); transition: box-shadow .3s ease, transform .25s ease;
}
@keyframes appear{ from { opacity: 0; transform: translateY(22px) scale(.985); } to { opacity: 1; transform: translateY(0) scale(1); } }

/* ---------- brand / logos ---------- */
.header-brand{ display:flex; flex-direction:column; align-items:center; justify-content:center; gap: .6rem; margin-bottom: clamp(8px,2.6vw,18px); }

/* brand-mark: wrapper for logos (حفظ ساختار کلی) */
.brand-mark{
  border-radius: 16px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  transform: translateZ(0);
  overflow: hidden;
  background: transparent;
}

/* لوگوی لایت مود */
.brand-mark .logo-light{
  display: block;
  width: clamp(100px, 20vw, 200px);  /* اندازه لایت مود */
  height: clamp(100px, 20vw, 200px);
  object-fit: contain;
  border-radius:16px;
}

/* لوگوی دارک مود */
.brand-mark .logo-dark{
  display: none;  /* پیش‌فرض پنهان */
  width: clamp(100px, 20vw, 260px);  /* اندازه دارک مود */
  height: clamp(100px, 20vw, 200px);
  object-fit: contain;
  border-radius:16px;
}

/* هنگام دارک مود */
[data-theme="dark"] .brand-mark .logo-light{ display: none; }
[data-theme="dark"] .brand-mark .logo-dark{ display: block; }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="dark"]) .brand-mark .logo-light{ display:none; }
  :root:not([data-theme="dark"]) .brand-mark .logo-dark{ display:block; }
}

/* fallback: if dark logo missing, JS will add .inverted to .brand-mark */
.brand-mark.inverted .logo-light{ display:block; filter: invert(1) hue-rotate(180deg) saturate(0.95); mix-blend-mode: normal; }

/* small adjustments for image smoothing */
.brand-mark img{ display:block; -webkit-user-drag:none; user-select:none; }

/* ---------- form + inputs (unchanged) ---------- */
.brand-sub { font-size: clamp(.88rem, 2vw, 1rem); color: rgba(30, 40, 60, 0.72); line-height: 1.1; max-width: 86%; text-align: center; margin-top: -20px; }
[data-theme="dark"] .brand-sub{ color: var(--text); opacity: .95; }

form{ display:flex; flex-direction:column; align-items:center; gap: 14px; width:100%; }
.form-group{ width:100%; display:flex; flex-direction:column; align-items:center; gap:6px; margin:0; }
.form-label { font-size: .95rem; color: rgba(30,40,60,0.85); width: 100%; text-align: right; direction: rtl; padding-right: 16px; }
[data-theme="dark"] .form-label{ color: var(--text); opacity: .98; }

.form-input{ width: calc(100% - 0px); max-width: 380px; padding: clamp(10px,2.6vw,14px); border-radius: 10px; border: 1px solid rgba(150,160,180,0.28); background: var(--input-bg); color: var(--text); font-size: clamp(.95rem,2.2vw,1rem); text-align: left; transition: box-shadow .25s ease, border-color .25s ease, transform .12s ease; -webkit-appearance:none; }
.form-input::placeholder{ color: rgba(60,70,90,0.35); }
.form-input:focus{ outline:none; border-color: rgba(0,92,255,0.9); box-shadow: 0 6px 18px rgba(0,92,255,0.14); transform: translateY(-1px); }

.btn{ width: 100%; max-width: 380px; padding: clamp(12px,3.4vw,16px); border-radius: 12px; border: none; background: linear-gradient(135deg,var(--primary),var(--accent)); color: #fff; font-weight:700; font-size: clamp(1rem,2.6vw,1.05rem); cursor: pointer; box-shadow: 0 10px 30px rgba(0,92,255,0.18); position: relative; overflow: hidden; transition: transform .18s ease, box-shadow .25s ease; }
.btn:active{ transform: translateY(1px) scale(.998); }
.btn:hover{ transform: translateY(-3px); box-shadow: 0 16px 40px rgba(0,92,255,0.26); }
.links{ margin-top: 10px; font-size: .95rem; color:var(--text); text-align:center; }
.links a{ color:var(--primary); text-decoration:none; font-weight:600; }

.theme-toggle{ margin-top: 14px; width: 84px; height: 38px; border-radius: 999px; background: var(--input-bg); border: 2px solid rgba(0,92,255,0.18); display:inline-block; position:relative; cursor:pointer; }
.theme-toggle .knob{ position:absolute; left:6px; top:5px; width:28px; height:28px; border-radius:50%; background:var(--primary); color:#fff; display:grid; place-items:center; font-size:14px; transition: transform .45s cubic-bezier(.2,.9,.3,1), left .45s ease; box-shadow: 0 6px 18px rgba(0,92,255,0.18); }
[data-theme="dark"] .theme-toggle .knob{ left: calc(100% - 34px); background: var(--accent); transform: rotate(360deg); }

.error{ color:#ff4d4d; font-weight:700; margin-bottom: 8px; font-size: .95rem; text-align:center; }

@media (max-width: 1024px){
  .form-container{
    max-width: 560px; 
    padding: clamp(16px,4.2vw,28px); 
    border-radius: 16px;
  }

  /* اندازهٔ معمول برند (لایت مود و پیش‌فرض) */
  .brand-mark{
    width: clamp(150px, 20vw, 200px) !important;
    height: clamp(100px, 20vw, 200px) !important;
    border-radius: 16px;
    display: grid;
    place-items: center;
    margin: 0 auto;
    transition: width .28s ease, height .28s ease, transform .28s ease;
  }

  /* افزایش اندازه مخصوص دارک مود */
  [data-theme="dark"] .brand-mark{
    /* حدود بزرگ‌تر — می‌تونی این مقادیر را بیشتر یا کمتر کنی */
    width: clamp(200px, 25vw, 200px) !important;
    height: clamp(100px, 25vw, 200px) !important;
  }

  /* لوگوها تمام فضای .brand-mark را پر کنند و نسبت حفظ شود */
  .brand-mark .logo-light,
  .brand-mark .logo-dark{
    width: 100% !important;
    height: 100% !important;
    object-fit: contain;
    display: block;
    transition: transform .28s ease;
  }

  /* اگر بخواهی برای دارک مود کمی «بزرگ‌نمایی» ظریف اضافه کنیم */
  [data-theme="dark"] .brand-mark .logo-dark{
    transform: scale(1.02);
  }
}

@media (max-width: 768px){ body{ padding-left:12px; padding-right:12px; } .form-container{ width: min(96vw, 440px); padding: 20px; border-radius: 14px; } .brand-mark{ width:48px; height:48px; } .header-brand{ gap:.6rem; margin-bottom: 14px; } }
@media (max-width: 480px){ .form-container{ width: calc(100% - 28px); padding: 18px; border-radius: 12px; box-shadow: 0 10px 30px rgba(0,0,0,0.12); } .brand-mark{ width:44px; height:44px; } .brand-sub{ font-size:.92rem; } .form-label{ font-size:.9rem; } .links{ font-size:.88rem; } .theme-toggle{ width:70px; height:34px; } .theme-toggle .knob{ width:26px; height:26px; left:6px; top:4px; } [data-theme="dark"] .theme-toggle .knob{ left: calc(100% - 32px); } }