/* ========================================================
   IBANCheck — Premium Dark Design System
   ======================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* ── Custom Properties ── */
:root {
  --bg-base:        #080c14;
  --bg-surface:     #0d1526;
  --bg-card:        rgba(255,255,255,0.04);
  --bg-card-hover:  rgba(255,255,255,0.07);
  --border:         rgba(255,255,255,0.08);
  --border-focus:   rgba(108,99,255,0.6);
  --accent:         #6c63ff;
  --accent-light:   #9b95ff;
  --accent-glow:    rgba(108,99,255,0.35);
  --cyan:           #00d4ff;
  --cyan-glow:      rgba(0,212,255,0.25);
  --green:          #00e5a0;
  --green-dark:     #00b37e;
  --green-glow:     rgba(0,229,160,0.2);
  --red:            #ff4d6d;
  --red-dark:       #d63857;
  --red-glow:       rgba(255,77,109,0.2);
  --text-primary:   #f0f4ff;
  --text-secondary: #8892aa;
  --text-muted:     #4a5568;
  --radius-sm:      8px;
  --radius-md:      14px;
  --radius-lg:      22px;
  --radius-xl:      32px;
  --shadow-sm:      0 2px 12px rgba(0,0,0,0.4);
  --shadow-md:      0 8px 32px rgba(0,0,0,0.5);
  --shadow-glow:    0 0 60px var(--accent-glow);
  --transition:     0.25s cubic-bezier(0.4,0,0.2,1);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg-base);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
}

/* ── Animated Background ── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 20% -10%, rgba(108,99,255,0.15) 0%, transparent 65%),
    radial-gradient(ellipse 60% 50% at 85% 110%, rgba(0,212,255,0.1) 0%, transparent 60%),
    radial-gradient(ellipse 40% 40% at 50% 50%, rgba(108,99,255,0.04) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

/* ── Layout ── */
.container {
  max-width: 780px;
  margin: 0 auto;
  padding: 0 20px;
  position: relative;
  z-index: 1;
}

.container--wide {
  max-width: 960px;
}

/* ── Navigation ── */
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
  position: relative;
  z-index: 10;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.nav__logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--accent), var(--cyan));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  box-shadow: 0 4px 16px var(--accent-glow);
}

.nav__logo-text {
  font-size: 1.2rem;
  font-weight: 800;
  background: linear-gradient(135deg, #fff 40%, var(--accent-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav__links {
  display: flex;
  gap: 28px;
  list-style: none;
}

.nav__links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--transition);
}
.nav__links a:hover { color: var(--text-primary); }

/* ── Hero ── */
.hero {
  text-align: center;
  padding: 70px 0 50px;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(108,99,255,0.12);
  border: 1px solid rgba(108,99,255,0.3);
  color: var(--accent-light);
  padding: 6px 14px;
  border-radius: 100px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 24px;
}

.hero__title {
  font-size: clamp(2rem, 6vw, 3.5rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 18px;
  background: linear-gradient(135deg, #ffffff 30%, var(--accent-light) 80%, var(--cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 520px;
  margin: 0 auto 50px;
  font-weight: 400;
}

/* ── Checker Card ── */
.checker {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 40px;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255,255,255,0.06);
  transition: box-shadow var(--transition);
}
.checker:focus-within {
  box-shadow: var(--shadow-md), var(--shadow-glow);
}

.checker__label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.checker__input-group {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.checker__input {
  flex: 1;
  min-width: 240px;
  background: rgba(255,255,255,0.04);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: 'Inter', monospace;
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  padding: 16px 20px;
  outline: none;
  transition: border-color var(--transition), background var(--transition), box-shadow var(--transition);
}
.checker__input::placeholder { color: var(--text-muted); letter-spacing: 0.02em; }
.checker__input:focus {
  border-color: var(--accent);
  background: rgba(108,99,255,0.06);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.checker__input.is-valid   { border-color: var(--green); box-shadow: 0 0 0 3px var(--green-glow); }
.checker__input.is-invalid { border-color: var(--red);   box-shadow: 0 0 0 3px var(--red-glow); }

.checker__btn {
  padding: 16px 32px;
  background: linear-gradient(135deg, var(--accent), #8b5cf6);
  border: none;
  border-radius: var(--radius-md);
  color: #fff;
  font-family: 'Inter', sans-serif;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
  white-space: nowrap;
  box-shadow: 0 4px 20px rgba(108,99,255,0.4);
  position: relative;
  overflow: hidden;
}
.checker__btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.15), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}
.checker__btn:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(108,99,255,0.55); }
.checker__btn:hover::after { opacity: 1; }
.checker__btn:active { transform: translateY(0); }

.checker__hint {
  margin-top: 14px;
  font-size: 0.80rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.checker__hint-example {
  color: var(--accent-light);
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--transition);
}
.checker__hint-example:hover { color: var(--cyan); }

/* ── Result Box ── */
.result {
  margin-top: 28px;
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  display: none;
  animation: resultIn 0.4s cubic-bezier(0.34,1.5,0.64,1) forwards;
  position: relative;
  overflow: hidden;
}
.result::before {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0.07;
  background: repeating-linear-gradient(
    -45deg,
    currentColor 0, currentColor 1px,
    transparent 0, transparent 50%
  );
  background-size: 14px 14px;
  pointer-events: none;
}
.result.is-valid {
  background: linear-gradient(135deg, rgba(0,229,160,0.1), rgba(0,180,125,0.05));
  border: 1.5px solid rgba(0,229,160,0.3);
  color: var(--green);
  display: block;
}
.result.is-invalid {
  background: linear-gradient(135deg, rgba(255,77,109,0.1), rgba(180,40,70,0.05));
  border: 1.5px solid rgba(255,77,109,0.3);
  color: var(--red);
  display: block;
}

.result__header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 6px;
}

.result__icon {
  font-size: 1.6rem;
  line-height: 1;
}

.result__status {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.result__message {
  font-size: 0.9rem;
  opacity: 0.85;
  margin-top: 4px;
  color: var(--text-secondary);
}

/* ── Details Grid ── */
.details {
  margin-top: 28px;
  display: none;
  animation: resultIn 0.5s 0.1s cubic-bezier(0.34,1.5,0.64,1) both;
}
.details.visible { display: block; }

.details__country {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-bottom: 16px;
}

.details__flag { font-size: 2rem; }

.details__country-info strong {
  display: block;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
}
.details__country-info span {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.details__iban-formatted {
  background: rgba(108,99,255,0.08);
  border: 1px solid rgba(108,99,255,0.2);
  border-radius: var(--radius-sm);
  padding: 12px 18px;
  font-family: 'Inter', monospace;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--accent-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  word-break: break-all;
}

.copy-btn {
  background: none;
  border: 1px solid rgba(108,99,255,0.3);
  color: var(--accent-light);
  padding: 4px 10px;
  font-size: 0.75rem;
  border-radius: 6px;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition);
  white-space: nowrap;
  margin-left: 12px;
  flex-shrink: 0;
}
.copy-btn:hover { background: rgba(108,99,255,0.15); border-color: var(--accent); }

.details__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 12px;
}

.details__item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  transition: background var(--transition), border-color var(--transition);
}
.details__item:hover { background: var(--bg-card-hover); border-color: rgba(255,255,255,0.14); }

.details__item-label {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 5px;
}
.details__item-value {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  font-family: 'Inter', monospace;
  word-break: break-all;
}

/* ── Stats Bar ── */
.stats {
  display: flex;
  justify-content: center;
  gap: 40px;
  padding: 40px 0 30px;
  flex-wrap: wrap;
}
.stat { text-align: center; }
.stat__value {
  font-size: 1.8rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--accent-light), var(--cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat__label {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-top: 2px;
}

/* ── Section ── */
.section {
  padding: 60px 0;
  border-top: 1px solid var(--border);
}
.section__title {
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}
.section__subtitle {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 36px;
}

/* ── Info Cards ── */
.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 18px;
}
.info-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 26px;
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
}
.info-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(255,255,255,0.14);
  transform: translateY(-3px);
}
.info-card__icon {
  font-size: 1.8rem;
  margin-bottom: 14px;
}
.info-card__title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.info-card__text {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ── Structure Diagram ── */
.iban-structure {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  margin: 24px 0;
}
.iban-block {
  flex: 1;
  min-width: 60px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  text-align: center;
}
.iban-block.country  { background: rgba(108,99,255,0.15); border: 1px solid rgba(108,99,255,0.3); }
.iban-block.check    { background: rgba(0,212,255,0.12); border: 1px solid rgba(0,212,255,0.3); }
.iban-block.bban     { background: rgba(0,229,160,0.1); border: 1px solid rgba(0,229,160,0.3); flex: 3; }
.iban-block__label   { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-muted); }
.iban-block__value   { font-size: 0.95rem; font-weight: 700; margin-top: 4px; }
.iban-block.country .iban-block__value   { color: var(--accent-light); }
.iban-block.check .iban-block__value     { color: var(--cyan); }
.iban-block.bban .iban-block__value      { color: var(--green); }

/* ── Country Table ── */
.countries-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 10px;
  max-height: 400px;
  overflow-y: auto;
  padding-right: 6px;
}
.countries-grid::-webkit-scrollbar { width: 4px; }
.countries-grid::-webkit-scrollbar-track { background: transparent; }
.countries-grid::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.country-row {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition);
  text-decoration: none;
  color: inherit;
}
.country-row:hover { background: var(--bg-card-hover); border-color: rgba(255,255,255,0.14); }
.country-row__flag { font-size: 1.3rem; }
.country-row__name { font-size: 0.83rem; font-weight: 500; flex: 1; }
.country-row__len  { font-size: 0.72rem; color: var(--text-muted); background: rgba(255,255,255,0.05); padding: 2px 6px; border-radius: 4px; }

/* ── FAQ ── */
.faq { display: flex; flex-direction: column; gap: 12px; }

.faq__item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.faq__question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  gap: 12px;
  transition: background var(--transition);
  list-style: none;
}
.faq__question:hover { background: var(--bg-card-hover); }
.faq__question::after {
  content: '+';
  font-size: 1.3rem;
  font-weight: 300;
  color: var(--accent-light);
  flex-shrink: 0;
  transition: transform var(--transition);
}
details[open] .faq__question::after { transform: rotate(45deg); }

.faq__answer {
  padding: 0 22px 18px;
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.7;
  border-top: 1px solid var(--border);
  padding-top: 16px;
}
.faq__answer code {
  background: rgba(108,99,255,0.15);
  color: var(--accent-light);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 0.875em;
}

/* ── Footer ── */
.footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.82rem;
  position: relative;
  z-index: 1;
}
.footer a { color: var(--text-secondary); text-decoration: none; }
.footer a:hover { color: var(--text-primary); }

/* ── Animations ── */
@keyframes resultIn {
  from { opacity: 0; transform: translateY(12px) scale(0.97); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 var(--green-glow); }
  50%       { box-shadow: 0 0 0 8px transparent; }
}
.result.is-valid { animation: resultIn 0.4s cubic-bezier(0.34,1.5,0.64,1) forwards; }

/* ── Spinner ── */
.checker__btn.loading {
  pointer-events: none;
  opacity: 0.7;
}
.checker__btn.loading span { display: none; }
.checker__btn.loading::before {
  content: '';
  width: 18px; height: 18px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: #fff;
  border-radius: 50%;
  display: inline-block;
  animation: spin 0.6s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Utility ── */
.text-accent   { color: var(--accent-light); }
.text-muted    { color: var(--text-muted); }
.text-green    { color: var(--green); }
.text-red      { color: var(--red); }
.mt-4  { margin-top: 1rem; }
.mb-4  { margin-bottom: 1rem; }

/* ── Responsive ── */
@media (max-width: 600px) {
  .nav__links { display: none; }
  .checker { padding: 24px; }
  .checker__input-group { flex-direction: column; }
  .checker__btn { width: 100%; }
  .stats { gap: 24px; }
  .details__grid { grid-template-columns: 1fr 1fr; }
  .iban-structure { flex-direction: column; }
}