/* Reset */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --color-primary: #212F5D;
  --color-primary-light: #2d3f7a;
  --color-accent: rgb(255, 192, 0);
  --color-accent-hover: rgb(230, 172, 0);
  --color-bg: #f8fafc;
  --color-card: #ffffff;
  --color-text: #1e293b;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;
  --color-error: #dc2626;
  --color-error-bg: #fef2f2;
  --color-success: #16a34a;
  --color-success-bg: #f0fdf4;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(33, 47, 93, 0.12);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
}

.container {
  max-width: 680px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

.hidden {
  display: none !important;
}

/* Header */
.header {
  text-align: center;
  margin-bottom: 3rem;
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.logo-img {
  height: 48px;
  width: auto;
  border-radius: 6px;
}

.logo h1 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-primary);
}

.version {
  font-size: 0.8rem;
  font-weight: 600;
  background: var(--color-accent);
  color: var(--color-primary);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
}

.subtitle {
  color: var(--color-text-muted);
  font-size: 1.1rem;
}

/* Header banner */
.header-banner {
  background: var(--color-primary);
  border-radius: var(--radius);
  padding: 1.5rem 2rem;
  margin-bottom: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
}

.header-banner .logo-img-large {
  height: 60px;
  width: auto;
  border-radius: 8px;
}

.header-banner-text {
  text-align: left;
}

.header-banner-text h1 {
  font-size: 1.8rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 0.25rem;
}

.header-banner-text p {
  color: var(--color-accent);
  font-size: 0.95rem;
  font-weight: 500;
}

.btn-guide {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--color-accent);
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 700;
  font-size: 0.95rem;
  padding: 0.6rem 1.1rem;
  border-radius: 8px;
  white-space: nowrap;
  transition: background 0.2s, transform 0.1s;
}

.btn-guide:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
}

.btn-guide:active {
  transform: translateY(0);
}

/* Login card */
.login-card {
  background: var(--color-card);
  border: 2px solid var(--color-border);
  border-top: 4px solid var(--color-accent);
  border-radius: var(--radius);
  padding: 2.5rem 2rem;
  text-align: center;
  box-shadow: var(--shadow);
  margin-bottom: 2.5rem;
}

.login-icon {
  color: var(--color-primary);
  margin-bottom: 1rem;
}

.login-card h2 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--color-primary);
}

.login-info {
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
}

/* Login form */
.login-form {
  text-align: left;
  max-width: 320px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 0.35rem;
  color: var(--color-primary);
}

.form-group input {
  width: 100%;
  padding: 0.7rem 0.9rem;
  border: 2px solid var(--color-border);
  border-radius: 8px;
  font-size: 1rem;
  transition: border-color 0.2s;
}

.form-group input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(255, 192, 0, 0.2);
}

.form-error {
  color: var(--color-error);
  font-size: 0.85rem;
  min-height: 1.2rem;
  margin-bottom: 0.5rem;
  text-align: center;
}

.btn-login {
  width: 100%;
  padding: 0.8rem;
  background: var(--color-primary);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}

.btn-login:hover {
  background: var(--color-primary-light);
  transform: translateY(-1px);
}

.btn-login:active {
  transform: translateY(0);
}

.btn-login:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* Download card */
.download-card {
  background: var(--color-card);
  border: 2px solid var(--color-border);
  border-top: 4px solid var(--color-accent);
  border-radius: var(--radius);
  padding: 2.5rem 2rem;
  text-align: center;
  box-shadow: var(--shadow);
  margin-bottom: 2.5rem;
}

.welcome-banner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  background: var(--color-primary);
  border-radius: 8px;
  padding: 0.7rem 1.2rem;
  margin-bottom: 1.5rem;
}

.welcome-text {
  font-weight: 600;
  color: var(--color-accent);
  font-size: 1.1rem;
}

.btn-logout {
  background: none;
  border: none;
  color: rgba(255, 255, 255, 0.7);
  cursor: pointer;
  padding: 0.25rem;
  border-radius: 4px;
  transition: color 0.2s;
}

.btn-logout:hover {
  color: #ffffff;
}

.download-icon {
  color: var(--color-primary);
  margin-bottom: 1rem;
}

.download-card h2 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--color-primary);
}

.download-info {
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
}

.btn-download {
  display: inline-block;
  background: var(--color-accent);
  color: var(--color-primary);
  border: none;
  padding: 0.9rem 2.5rem;
  border-radius: 8px;
  font-size: 1.1rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}

.btn-download:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
}

.btn-download:active {
  transform: translateY(0);
}

.btn-download:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.file-info {
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* Progress bar */
.download-progress {
  margin-top: 1.5rem;
}

.progress-bar {
  width: 100%;
  height: 6px;
  background: var(--color-border);
  border-radius: 3px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: var(--color-accent);
  border-radius: 3px;
  transition: width 0.3s;
}

.progress-text {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-top: 0.5rem;
}

/* Sections */
.instructions,
.requirements {
  background: var(--color-card);
  border: 2px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius);
  padding: 1.5rem 2rem;
  margin-bottom: 1.5rem;
}

.instructions h3,
.requirements h3 {
  font-size: 1.1rem;
  margin-bottom: 0.75rem;
  color: var(--color-primary);
}

.instructions ol,
.requirements ul {
  padding-left: 1.25rem;
}

.instructions li,
.requirements li {
  margin-bottom: 0.4rem;
  color: var(--color-text-muted);
}

.instructions code {
  background: #f1f5f9;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.9em;
  color: var(--color-primary);
}

/* Footer */
.footer {
  text-align: center;
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 2px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

.footer-logo {
  height: 30px;
  width: auto;
  opacity: 0.6;
  margin-bottom: 0.5rem;
}

.footer-links {
  margin-top: 0.5rem;
}

.footer-links a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
}

.footer-links a:hover {
  text-decoration: underline;
  color: var(--color-accent-hover);
}

/* Responsive */
@media (max-width: 480px) {
  .container {
    padding: 2rem 1rem;
  }

  .login-card,
  .download-card {
    padding: 2rem 1.25rem;
  }

  .header-banner {
    flex-direction: column;
    text-align: center;
  }

  .header-banner-text {
    text-align: center;
  }

  .header-banner-text h1 {
    font-size: 1.4rem;
  }

  .login-form {
    max-width: 100%;
  }
}