/* style.css — ธีม Light ทางการ สสจ. (ตาม brand-blue.css) */
:root {
  --text-navy: #111827;
  --text-gray: #4b5563;
  --text-muted: #6b7280;
  --bg-page: radial-gradient(circle at top left, #f0fdfa 0%, #ffffff 35%, #ffffff 60%, #eff6ff 100%);
  --brand-gradient: linear-gradient(135deg, #0ea5e9 0%, #10b981 100%);
  --shadow-card: 4px 10px 35px rgba(14, 165, 233, 0.10);
  --shadow-btn: 0 8px 20px rgba(16, 185, 129, 0.25);
  --shadow-btn-hover: 0 10px 25px rgba(16, 185, 129, 0.35);
  --border: #e5e7eb;
  --font-main: 'Inter', 'Noto Sans Thai', system-ui, sans-serif;
}

* { box-sizing: border-box; }

body, html {
  margin: 0;
  padding: 0;
  width: 100%;
  min-height: 100vh;
  background: var(--bg-page);
  font-family: var(--font-main);
  color: var(--text-navy);
}

.login-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 32px;
  padding: 32px 20px;
}

/* ===== Brand Panel ===== */
.brand-panel {
  text-align: center;
  max-width: 420px;
}

.main-logo {
  width: 84px;
  height: auto;
  object-fit: contain;
  margin-bottom: 10px;
}

.sys-subtitle {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-gray);
  margin-bottom: 16px;
}

.sys-title {
  font-size: 30px;
  font-weight: 800;
  line-height: 1.2;
  margin: 0 0 12px 0;
  letter-spacing: -0.5px;
  color: var(--text-navy);
}

.sys-title .highlight {
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.brand-desc {
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-gray);
  margin: 0;
}

/* ===== Login Panel ===== */
.login-panel {
  width: 100%;
  max-width: 400px;
}

.login-card {
  background: #ffffff;
  border-radius: 20px;
  box-shadow: var(--shadow-card), inset 0 0 0 1px rgba(255,255,255,0.8);
  padding: 32px 28px;
}

.login-card h2 {
  font-size: 20px;
  font-weight: 800;
  color: var(--text-navy);
  margin: 0 0 4px 0;
}

.login-hint {
  font-size: 13px;
  color: var(--text-muted);
  margin: 0 0 24px 0;
}

.field {
  margin-bottom: 18px;
}

.field label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-navy);
  margin-bottom: 8px;
}

.field input {
  width: 100%;
  padding: 14px 14px;
  font-family: var(--font-main);
  font-size: 15px;
  color: var(--text-navy);
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: 12px;
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.field input:focus {
  border-color: #0ea5e9;
  box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.12);
}

.field input::placeholder {
  color: #9ca3af;
}

.error-msg {
  font-size: 13px;
  font-weight: 600;
  color: #dc2626;
  background: #fef2f2;
  border: 1px solid #fecaca;
  border-radius: 10px;
  padding: 10px 12px;
  margin: 0 0 16px 0;
}

.btn-login {
  width: 100%;
  padding: 15px;
  border: none;
  border-radius: 12px;
  background: var(--brand-gradient);
  color: #ffffff;
  font-family: var(--font-main);
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: var(--shadow-btn);
}

.btn-login:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-btn-hover);
}

.btn-login:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none;
}

.login-foot {
  font-size: 12px;
  color: var(--text-muted);
  text-align: center;
  margin: 20px 0 0 0;
}

/* ===== Desktop ===== */
@media (min-width: 800px) {
  .login-page {
    flex-direction: row;
    gap: 60px;
  }
  .brand-panel {
    text-align: left;
  }
  .sys-title {
    font-size: 38px;
  }
}