/* =============================================
   CardShield – Smart Card Validator
   style.css
   ============================================= */

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

:root {
  --bg-deep:       #0a0c12;
  --bg-surface:    #0f1219;
  --bg-panel:      rgba(255,255,255,0.04);
  --bg-panel-hov:  rgba(255,255,255,0.06);
  --border:        rgba(255,255,255,0.08);
  --border-focus:  rgba(96,165,250,0.5);

  --accent:        #3b82f6;
  --accent-light:  #60a5fa;
  --accent-glow:   rgba(59,130,246,0.25);

  --success:       #22c55e;
  --success-bg:    rgba(34,197,94,0.1);
  --error:         #ef4444;
  --error-bg:      rgba(239,68,68,0.1);
  --warn:          #f59e0b;
  --warn-bg:       rgba(245,158,11,0.1);

  --text-primary:  #f0f4ff;
  --text-secondary:#8892a4;
  --text-muted:    #4a5568;

  --card-grad-1:   #1a2540;
  --card-grad-2:   #0f1929;

  --font-display: 'Syne', sans-serif;
  --font-body:    'DM Sans', sans-serif;
  --font-mono:    'DM Mono', monospace;

  --radius-sm:  8px;
  --radius-md:  14px;
  --radius-lg:  20px;
  --radius-xl:  28px;

  --shadow-panel: 0 24px 60px rgba(0,0,0,0.5), 0 8px 20px rgba(0,0,0,0.3);
  --shadow-card:  0 30px 80px rgba(0,0,0,0.6), 0 8px 24px rgba(0,0,0,0.4);
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg-deep);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ---- Background Mesh ---- */
.bg-mesh {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 60% 50% at 20% 10%, rgba(59,130,246,0.08) 0%, transparent 60%),
    radial-gradient(ellipse 50% 40% at 80% 80%, rgba(99,102,241,0.06) 0%, transparent 60%),
    radial-gradient(ellipse 40% 30% at 50% 50%, rgba(14,165,233,0.04) 0%, transparent 70%);
}

/* ---- Page Wrapper ---- */
.page-wrapper {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 48px 20px 64px;
  gap: 48px;
}

/* =============================================
   HEADER
   ============================================= */
.site-header {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.header-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(59,130,246,0.1);
  border: 1px solid rgba(59,130,246,0.25);
  border-radius: 100px;
  padding: 5px 14px 5px 10px;
  color: var(--accent-light);
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.shield-icon {
  display: flex;
  align-items: center;
}

.site-title {
  font-family: var(--font-display);
  font-size: clamp(36px, 6vw, 56px);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1;
  background: linear-gradient(135deg, #e8eeff 0%, #93c5fd 50%, #60a5fa 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.site-subtitle {
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 300;
  color: var(--text-secondary);
  letter-spacing: 0.02em;
}

/* =============================================
   MAIN LAYOUT
   ============================================= */
.main-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  width: 100%;
  max-width: 860px;
  align-items: start;
}

/* =============================================
   CARD PREVIEW
   ============================================= */
.card-preview-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding-top: 16px;
}

.card-preview {
  position: relative;
  width: 100%;
  max-width: 360px;
  aspect-ratio: 1.586 / 1;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, var(--card-grad-1) 0%, var(--card-grad-2) 100%);
  border: 1px solid rgba(255,255,255,0.1);
  box-shadow: var(--shadow-card);
  padding: 28px 28px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card-preview:hover {
  transform: translateY(-3px);
  box-shadow: 0 40px 90px rgba(0,0,0,0.7), 0 12px 30px rgba(59,130,246,0.12);
}

.card-glow {
  position: absolute;
  inset: 0;
  border-radius: var(--radius-xl);
  background: radial-gradient(ellipse at 30% 20%, rgba(59,130,246,0.12) 0%, transparent 70%);
  pointer-events: none;
}

/* Card top row */
.card-preview > *:first-child { position: relative; z-index: 1; }

.card-chip {
  width: 36px;
  height: 28px;
}

.card-network {
  position: absolute;
  top: 24px;
  right: 24px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: rgba(255,255,255,0.75);
  text-transform: uppercase;
  transition: all 0.3s ease;
}

.network-label { white-space: nowrap; }

/* Card number */
.card-number-preview {
  font-family: var(--font-mono);
  font-size: clamp(16px, 2.4vw, 20px);
  font-weight: 500;
  letter-spacing: 0.2em;
  color: rgba(255,255,255,0.9);
  position: relative;
  z-index: 1;
  transition: all 0.2s ease;
}

/* Card meta (expiry) */
.card-meta {
  display: flex;
  gap: 28px;
  position: relative;
  z-index: 1;
}

.card-meta-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.meta-label {
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
}

.meta-value {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 500;
  color: rgba(255,255,255,0.85);
  letter-spacing: 0.1em;
  transition: all 0.2s ease;
}

/* Card type brand colors */
.card-preview.visa-card {
  background: linear-gradient(135deg, #1a237e 0%, #283593 50%, #1565c0 100%);
}
.card-preview.mastercard-card {
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
}
.card-preview.amex-card {
  background: linear-gradient(135deg, #006064 0%, #00838f 50%, #00acc1 100%);
}
.card-preview.rupay-card {
  background: linear-gradient(135deg, #1b5e20 0%, #2e7d32 50%, #388e3c 100%);
}

/* =============================================
   VALIDATOR PANEL
   ============================================= */
.validator-panel {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-panel);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.panel-header {
  padding: 28px 28px 0;
}

.panel-header h2 {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.panel-header p {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 4px;
  font-weight: 300;
}

.form-body {
  padding: 24px 28px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* ---- Field Groups ---- */
.field-group {
  display: flex;
  flex-direction: column;
  gap: 7px;
  flex: 1;
}

.field-group label {
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.field-row {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 8px;
  align-items: end;
}

.field-divider {
  font-size: 20px;
  color: var(--text-muted);
  padding-bottom: 10px;
  text-align: center;
  font-weight: 300;
}

/* ---- Inputs ---- */
.input-wrap {
  position: relative;
}

.field-input {
  width: 100%;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 11px 40px 11px 14px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 400;
  color: var(--text-primary);
  outline: none;
  transition: border-color 0.2s, background 0.2s, box-shadow 0.2s;
  letter-spacing: 0.04em;
}

.field-input::placeholder {
  color: var(--text-muted);
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

.field-input:focus {
  border-color: var(--border-focus);
  background: rgba(59,130,246,0.04);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.input-icon {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  pointer-events: none;
}

/* ---- Card Type Badge ---- */
.card-type-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-light);
  min-height: 16px;
  transition: opacity 0.3s ease;
  opacity: 0;
}

.card-type-badge.visible {
  opacity: 1;
}

.card-type-badge::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-light);
  flex-shrink: 0;
}

/* ---- Validate Button ---- */
.validate-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: var(--accent);
  border: none;
  border-radius: var(--radius-sm);
  padding: 13px 24px;
  color: #fff;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
  box-shadow: 0 4px 20px rgba(59,130,246,0.35);
  width: 100%;
  margin-top: 4px;
}

.validate-btn:hover {
  background: var(--accent-light);
  transform: translateY(-1px);
  box-shadow: 0 6px 28px rgba(59,130,246,0.45);
}

.validate-btn:active {
  transform: translateY(0);
  box-shadow: 0 2px 12px rgba(59,130,246,0.3);
}

.btn-arrow {
  display: flex;
  align-items: center;
  transition: transform 0.2s;
}

.validate-btn:hover .btn-arrow {
  transform: translateX(3px);
}

/* ---- Panel Footer ---- */
.panel-footer {
  border-top: 1px solid var(--border);
  padding: 14px 28px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.docs-link {
  font-size: 12px;
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 400;
  transition: color 0.2s;
  letter-spacing: 0.01em;
}

.docs-link:hover { color: var(--accent-light); }

.footer-divider {
  color: var(--text-muted);
  font-size: 12px;
}

.footer-note {
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 0.03em;
}

/* =============================================
   MODAL
   ============================================= */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(5, 7, 14, 0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: all;
}

.modal-box {
  background: #141824;
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 40px 36px 36px;
  max-width: 380px;
  width: 100%;
  position: relative;
  text-align: center;
  box-shadow: 0 40px 100px rgba(0,0,0,0.7);
  transform: scale(0.92) translateY(12px);
  transition: transform 0.28s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.25s ease;
  opacity: 0;
}

.modal-overlay.active .modal-box {
  transform: scale(1) translateY(0);
  opacity: 1;
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 50%;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}

.modal-close:hover {
  background: var(--bg-panel-hov);
  color: var(--text-primary);
}

.modal-icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 26px;
}

.modal-icon.success { background: var(--success-bg); color: var(--success); border: 1px solid rgba(34,197,94,0.2); }
.modal-icon.error   { background: var(--error-bg);   color: var(--error);   border: 1px solid rgba(239,68,68,0.2); }
.modal-icon.warn    { background: var(--warn-bg);    color: var(--warn);    border: 1px solid rgba(245,158,11,0.2); }

.modal-title {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.modal-message {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  font-weight: 300;
  margin-bottom: 28px;
}

.modal-btn {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 28px;
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
}

.modal-btn:hover {
  background: var(--bg-panel-hov);
  border-color: rgba(255,255,255,0.15);
}

/* =============================================
   RESPONSIVE
   ============================================= */
@media (max-width: 700px) {
  .page-wrapper {
    padding: 36px 16px 56px;
    gap: 36px;
  }

  .main-layout {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .card-preview-wrap {
    padding-top: 0;
  }

  .card-preview {
    max-width: 100%;
  }

  .card-number-preview {
    font-size: 15px;
    letter-spacing: 0.15em;
  }

  .panel-header { padding: 22px 20px 0; }
  .form-body    { padding: 20px 20px; }
  .panel-footer { padding: 12px 20px; }

  .modal-box {
    padding: 32px 24px 28px;
  }
}

@media (max-width: 400px) {
  .field-row {
    grid-template-columns: 1fr auto 1fr;
    gap: 6px;
  }

  .card-number-preview {
    font-size: 13px;
    letter-spacing: 0.1em;
  }
}

/* =============================================
   UTILITY
   ============================================= */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}