* {
  margin: 0;
  padding: 0;
  box-sizing: border-box; 
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  transition: background 0.4s cubic-bezier(0.25, 0.8, 0.25, 1), 
              color 0.4s ease, 
              border-color 0.4s ease, 
              box-shadow 0.4s ease; 
}

:root {
  --bg-color: #f0f4f8;
  --bg-gradient: linear-gradient(135deg, #f5f7fa 0%, #e4ebf5 100%);
  --card-bg: #ffffff;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --border-color: #e2e8f0;
  --select-bg: #f8fafc;
  --select-border: #cbd5e1;
  --feature-text: #334155;
  --accent-color: #3b82f6;
  --accent-glow: rgba(59, 130, 246, 0.15);
  --success-color: #10b981;
}

.dark-theme {
  --bg-color: #0b0f19;
  --bg-gradient: radial-gradient(circle at top right, #1e1b4b 0%, #0f172a 50%, #020617 100%);
  --card-bg: rgba(15, 23, 42, 0.65);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --border-color: rgba(51, 65, 85, 0.5);
  --select-bg: #1e293b;
  --select-border: #334155;
  --feature-text: #cbd5e1;
  --accent-color: #60a5fa;
  --accent-glow: rgba(96, 165, 250, 0.25);
  --success-color: #10b981;
}

body {
  background: var(--bg-gradient);
  background-color: var(--bg-color);
  min-height: 100vh;
  display: flex;
  flex-direction: column; 
}

.content-wrapper {
  flex: 1; 
  display: flex;
  justify-content: center; 
  align-items: center;     
  padding: 40px 20px;
  width: 100%;
}

.admin-panel {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 15px 40px;
  color: white;
  width: 100%;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.logo img {
  max-width: 140px;
  width: 100%;     
  height: 40px;
  object-fit: contain; 
}

.nav-links {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 35px;
}

.nav-links a, .nav-btn, .nav-link-item {
  color: #94a3b8;
  text-decoration: none;
  font-weight: 500;
  font-size: 16px;
  background: none;
  border: none;
  cursor: pointer;
  transition: color 0.2s ease;
}

.nav-links a:hover, .nav-btn:hover, .nav-link-item:hover {
  color: var(--accent-color);
}

.theme-btn {
  background: none; 
  border: none;
  color: #ffffff;
  padding: 5px;
  cursor: pointer;
  font-size: 24px;
  outline: none;
  display: flex;
  align-items: center;
}

.vps-configurator {
  background: var(--card-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  width: 100%;
  max-width: 580px;
  padding: 45px 40px;
  border-radius: 24px;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25),
              0 0 40px 0 var(--accent-glow);
  border: 1px solid var(--border-color);
}

.vps-configurator h2 {
  text-align: center;
  color: var(--text-main);
  margin-top: 0;
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.price-display {
  text-align: center;
  font-size: 32px;
  font-weight: 800;
  color: var(--accent-color);
  margin-bottom: 35px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 25px;
  letter-spacing: -0.5px;
}

.form-group {
  margin-bottom: 25px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 10px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.form-group select {
  width: 100%;
  padding: 14px 18px;
  border: 1px solid var(--select-border);
  border-radius: 12px;
  background: var(--select-bg);
  color: var(--text-main);
  font-size: 17px;
  font-weight: 500;
  outline: none;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='w3.org' fill='none' viewBox='0 0 24 24' stroke='%2364748b'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 18px center;
  background-size: 16px;
}

.form-group select:focus {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-group select option {
  background: var(--select-bg);
  color: var(--text-main);
}

.features-list {
  margin: 30px 0;
  border-top: 1px solid var(--border-color);
  padding-top: 25px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.feature-item {
  font-size: 16px;
  font-weight: 500;
  color: var(--feature-text);
  display: flex;
  align-items: center;
}

.order-btn {
  width: 100%;
  background-color: var(--success-color);
  color: #ffffff;
  border: none;
  padding: 16px;
  border-radius: 14px;
  font-size: 18px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 10px 15px -3px rgba(16, 185, 129, 0.3);
  transition: transform 0.2s, filter 0.2s;
}

.order-btn:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
}

.order-btn:active {
  transform: translateY(1px);
}

.modal {
  display: none; 
  position: fixed; 
  z-index: 1000; 
  left: 0;
  top: 0;
  width: 100%; 
  height: 100%; 
  background-color: rgba(2, 6, 23, 0.7); 
  backdrop-filter: blur(8px);
}

.modal-content {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  margin: 8% auto; 
  padding: 40px;
  width: 100%;
  max-width: 440px; 
  border-radius: 24px;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.4);
  position: relative;
}

.close-btn {
  position: absolute;
  right: 25px;
  top: 20px;
  color: var(--text-muted);
  font-size: 28px;
  cursor: pointer;
}

.close-btn:hover {
  color: #f43f5e;
}

.auth-tabs {
  display: flex;
  margin-bottom: 30px;
  border-bottom: 1px solid var(--border-color);
}

.tab-btn {
  flex: 1;
  background: none;
  border: none;
  padding: 14px;
  color: var(--text-muted);
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
}

.tab-btn.active {
  color: var(--accent-color);
  border-bottom: 2px solid var(--accent-color);
  margin-bottom: -1px;
}

.input-group {
  margin-bottom: 20px;
}

.input-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.input-group input {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--select-border);
  border-radius: 10px;
  background-color: var(--select-bg);
  color: var(--text-main);
  font-size: 16px;
  outline: none;
}

.input-group input:focus {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.submit-btn {
  width: 100%;
  border: none;
  padding: 14px;
  border-radius: 10px;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
}

.blue-btn { background-color: var(--accent-color); color: white; }
.green-btn { background-color: var(--success-color); color: white; }

.logout-link-btn {
  background: none;
  border: none;
  color: #f43f5e;
  font-weight: 700;
  cursor: pointer;
  margin-left: 15px;
  font-size: 15px;
}

.auth-form.hidden {
  display: none;
}

.logout-btn {
  background-color: #e74c3c;
  padding: 5px 15px;
  border-radius: 4px;
}

.logout-btn:hover {
  background-color: #c0392b !important;
  color: white !important;
}

.application-body {
  background: var(--bg-gradient);
  background-color: var(--bg-color);
}

.application-container {
  background: var(--card-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  width: 100%;
  max-width: 580px;
  padding: 45px 40px;
  border-radius: 24px;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25),
              0 0 40px 0 var(--accent-glow);
  border: 1px solid var(--border-color);
}

.application-container h2 {
  font-size: 26px;
  font-weight: 700;
  text-align: center;
  color: var(--text-main);
  margin-bottom: 30px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 15px;
  letter-spacing: -0.5px;
}

.form-section {
  margin-bottom: 25px;
  border: 1px solid var(--border-color);
  padding: 20px;
  border-radius: 14px;
  background-color: rgba(0, 0, 0, 0.02);
}

.form-section h3 {
  font-size: 14px;
  font-weight: 600;
  color: var(--accent-color);
  margin-bottom: 15px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.application-container .input-group {
  margin-bottom: 18px;
}

.application-container .input-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.application-container .input-group input {
  width: 100%;
  padding: 14px 18px;
  border: 1px solid var(--select-border);
  border-radius: 12px;
  background-color: var(--select-bg);
  color: var(--text-main);
  font-size: 16px;
  font-weight: 500;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.application-container .input-group input:focus {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.application-container .input-group input[readonly] {
  opacity: 0.7;
  cursor: not-allowed;
}

.application-container .green-btn {
  width: 100%;
  background-color: var(--success-color);
  color: #ffffff;
  border: none;
  padding: 16px;
  border-radius: 14px;
  font-size: 18px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 10px 15px -3px rgba(16, 185, 129, 0.3);
  transition: transform 0.2s, filter 0.2s;
}

.application-container .green-btn:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
}

.application-container .green-btn:active {
  transform: translateY(1px);
}