/* ===== Design Tokens ===== */
:root {
  /* Palette – Cisco-inspired teal + warm neutrals */
  --clr-bg:           #0b0f14;
  --clr-surface:      #111820;
  --clr-surface-alt:  #161e28;
  --clr-card:         rgba(22, 30, 40, 0.65);
  --clr-card-border:  rgba(255, 255, 255, 0.06);
  --clr-glass:        rgba(22, 30, 40, 0.45);
  --clr-primary:      #00bceb;
  --clr-primary-dim:  #0091b8;
  --clr-accent:       #6cc04a;
  --clr-accent-dim:   #4d9636;
  --clr-danger:       #f74b5e;
  --clr-warning:      #f5a623;
  --clr-text:         #e8ecf1;
  --clr-text-muted:   #8695a7;
  --clr-text-dim:     #536275;
  --clr-white:        #ffffff;

  /* Glow */
  --glow-primary: 0 0 40px rgba(0, 188, 235, 0.15);
  --glow-accent:  0 0 40px rgba(108, 192, 74, 0.12);

  /* Type */
  --ff-display: 'Outfit', sans-serif;
  --ff-body:    'Inter', sans-serif;
  --ff-mono:    'JetBrains Mono', 'Fira Code', monospace;

  /* Radius */
  --r-sm: 8px;
  --r-md: 16px;
  --r-lg: 24px;
  --r-xl: 32px;

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --t-fast: 0.2s;
  --t-med:  0.4s;
  --t-slow: 0.6s;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--ff-body);
  background: var(--clr-bg);
  color: var(--clr-text);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}

/* ===== Accessibility ===== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ===== Background Noise + Gradient ===== */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% -10%, rgba(0, 188, 235, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 80% 100%, rgba(108, 192, 74, 0.05) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

/* ===== Navigation ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 40px;
  background: rgba(11, 15, 20, 0.8);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--clr-card-border);
  transition: background var(--t-fast) var(--ease-out);
}

.navbar__brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.navbar__logo {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--clr-primary), var(--clr-accent));
  border-radius: var(--r-sm);
  display: grid;
  place-items: center;
}

.navbar__logo svg {
  width: 20px;
  height: 20px;
  fill: var(--clr-white);
}

.navbar__title {
  font-family: var(--ff-display);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--clr-white);
  letter-spacing: -0.01em;
}

.navbar__subtitle {
  font-size: 0.75rem;
  color: var(--clr-text-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.navbar__links {
  display: flex;
  gap: 8px;
  list-style: none;
}

.navbar__links a {
  display: inline-block;
  padding: 8px 20px;
  border-radius: var(--r-sm);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--clr-text-muted);
  text-decoration: none;
  transition: color var(--t-fast), background var(--t-fast);
}

.navbar__links a:hover,
.navbar__links a:focus-visible {
  color: var(--clr-white);
  background: rgba(255, 255, 255, 0.05);
}

/* ===== Layout ===== */
.page-wrapper {
  position: relative;
  z-index: 1;
  padding-top: 80px;
}

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 80px 0;
}

/* ===== Hero ===== */
.hero {
  padding: 96px 0 64px;
  text-align: center;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 999px;
  background: rgba(0, 188, 235, 0.08);
  border: 1px solid rgba(0, 188, 235, 0.2);
  color: var(--clr-primary);
  font-size: 0.8125rem;
  font-weight: 500;
  margin-bottom: 32px;
  animation: fadeInUp 0.6s var(--ease-out) both;
}

.hero__badge .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--clr-accent);
  animation: pulse 2s ease infinite;
}

.hero__title {
  font-family: var(--ff-display);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  color: var(--clr-white);
  line-height: 1.15;
  letter-spacing: -0.025em;
  margin-bottom: 16px;
  animation: fadeInUp 0.6s var(--ease-out) 0.1s both;
}

.hero__title .gradient-text {
  background: linear-gradient(135deg, var(--clr-primary) 0%, var(--clr-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__desc {
  font-size: 1.125rem;
  color: var(--clr-text-muted);
  max-width: 560px;
  margin: 0 auto 40px;
  animation: fadeInUp 0.6s var(--ease-out) 0.2s both;
}

/* ===== Certificate Card ===== */
.cert-card {
  position: relative;
  background: var(--clr-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--clr-card-border);
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: var(--glow-primary);
  animation: fadeInUp 0.8s var(--ease-out) 0.3s both;
  transition: box-shadow var(--t-med) var(--ease-out);
}

.cert-card:hover {
  box-shadow: 0 0 60px rgba(0, 188, 235, 0.2);
}

.cert-card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 28px;
  border-bottom: 1px solid var(--clr-card-border);
  background: rgba(0, 0, 0, 0.2);
}

.cert-card__header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.cert-card__icon {
  width: 40px;
  height: 40px;
  border-radius: var(--r-sm);
  background: rgba(0, 188, 235, 0.1);
  border: 1px solid rgba(0, 188, 235, 0.2);
  display: grid;
  place-items: center;
  color: var(--clr-primary);
}

.cert-card__filename {
  font-family: var(--ff-mono);
  font-size: 0.875rem;
  color: var(--clr-text);
}

.cert-card__meta {
  font-size: 0.75rem;
  color: var(--clr-text-dim);
}

.cert-card__actions {
  display: flex;
  gap: 8px;
}

.cert-card__preview {
  position: relative;
  cursor: pointer;
  overflow: hidden;
}

.cert-card__preview img {
  width: 100%;
  display: block;
  transition: transform var(--t-med) var(--ease-out);
}

.cert-card__preview:hover img {
  transform: scale(1.02);
}

.cert-card__overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  display: grid;
  place-items: center;
  opacity: 0;
  transition: opacity var(--t-fast);
}

.cert-card__preview:hover .cert-card__overlay {
  opacity: 1;
}

.cert-card__overlay span {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(12px);
  border-radius: var(--r-sm);
  font-weight: 500;
  color: var(--clr-white);
  font-size: 0.9375rem;
}

/* ===== Details Grid ===== */
.details {
  padding: 48px 0 80px;
}

.details__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.detail-tile {
  position: relative;
  background: var(--clr-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--clr-card-border);
  border-radius: var(--r-md);
  padding: 24px;
  transition: border-color var(--t-fast), transform var(--t-fast) var(--ease-out);
}

.detail-tile:hover {
  border-color: rgba(0, 188, 235, 0.15);
  transform: translateY(-2px);
}

.detail-tile__label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--clr-text-dim);
  margin-bottom: 8px;
}

.detail-tile__value {
  font-family: var(--ff-display);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--clr-white);
  word-break: break-word;
}

.detail-tile__value.mono {
  font-family: var(--ff-mono);
  font-size: 0.8125rem;
  color: var(--clr-primary);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--r-sm);
  font-family: var(--ff-body);
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all var(--t-fast) var(--ease-out);
  white-space: nowrap;
}

.btn svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.btn--primary {
  background: linear-gradient(135deg, var(--clr-primary), var(--clr-primary-dim));
  color: var(--clr-white);
  box-shadow: 0 4px 20px rgba(0, 188, 235, 0.25);
}

.btn--primary:hover {
  box-shadow: 0 6px 30px rgba(0, 188, 235, 0.4);
  transform: translateY(-1px);
}

.btn--secondary {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--clr-card-border);
  color: var(--clr-text);
}

.btn--secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.12);
}

.btn--accent {
  background: linear-gradient(135deg, var(--clr-accent), var(--clr-accent-dim));
  color: var(--clr-white);
  box-shadow: 0 4px 20px rgba(108, 192, 74, 0.25);
}

.btn--accent:hover {
  box-shadow: 0 6px 30px rgba(108, 192, 74, 0.4);
  transform: translateY(-1px);
}

.btn--lg {
  padding: 16px 32px;
  font-size: 1rem;
  border-radius: 12px;
}

.btn-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 32px;
  animation: fadeInUp 0.6s var(--ease-out) 0.35s both;
}

/* ===== Verify Section ===== */
.verify {
  padding: 80px 0;
}

.verify__heading {
  text-align: center;
  margin-bottom: 48px;
}

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--clr-primary);
  margin-bottom: 12px;
}

.section-title {
  font-family: var(--ff-display);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  color: var(--clr-white);
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.section-desc {
  font-size: 1rem;
  color: var(--clr-text-muted);
  max-width: 480px;
  margin: 0 auto;
}

.verify__card {
  background: var(--clr-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--clr-card-border);
  border-radius: var(--r-lg);
  overflow: hidden;
  max-width: 640px;
  margin: 0 auto;
}

.verify__tabs {
  display: flex;
  border-bottom: 1px solid var(--clr-card-border);
}

.verify__tab {
  flex: 1;
  padding: 16px;
  background: none;
  border: none;
  font-family: var(--ff-body);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--clr-text-muted);
  cursor: pointer;
  transition: all var(--t-fast);
  position: relative;
}

.verify__tab::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 16px;
  right: 16px;
  height: 2px;
  background: var(--clr-primary);
  border-radius: 2px 2px 0 0;
  opacity: 0;
  transition: opacity var(--t-fast);
}

.verify__tab.active {
  color: var(--clr-primary);
}

.verify__tab.active::after {
  opacity: 1;
}

.verify__tab:hover {
  color: var(--clr-text);
  background: rgba(255, 255, 255, 0.02);
}

.verify__panel {
  display: none;
  padding: 32px;
}

.verify__panel.active {
  display: block;
}

.verify__input-group {
  margin-bottom: 24px;
}

.verify__label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--clr-text-muted);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.verify__input {
  width: 100%;
  padding: 14px 16px;
  border-radius: var(--r-sm);
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(0, 0, 0, 0.3);
  color: var(--clr-text);
  font-family: var(--ff-mono);
  font-size: 0.875rem;
  transition: border-color var(--t-fast);
  outline: none;
}

.verify__input:focus {
  border-color: var(--clr-primary);
  box-shadow: 0 0 0 3px rgba(0, 188, 235, 0.1);
}

.verify__input::placeholder {
  color: var(--clr-text-dim);
}

/* File drop zone */
.drop-zone {
  position: relative;
  border: 2px dashed rgba(255, 255, 255, 0.1);
  border-radius: var(--r-md);
  padding: 40px 24px;
  text-align: center;
  cursor: pointer;
  transition: all var(--t-fast);
  margin-bottom: 24px;
}

.drop-zone:hover,
.drop-zone.dragover {
  border-color: var(--clr-primary);
  background: rgba(0, 188, 235, 0.03);
}

.drop-zone__icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 12px;
  border-radius: var(--r-sm);
  background: rgba(0, 188, 235, 0.08);
  display: grid;
  place-items: center;
  color: var(--clr-primary);
}

.drop-zone__text {
  font-size: 0.9375rem;
  color: var(--clr-text-muted);
}

.drop-zone__text strong {
  color: var(--clr-primary);
}

.drop-zone__hint {
  font-size: 0.75rem;
  color: var(--clr-text-dim);
  margin-top: 4px;
}

.drop-zone input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

/* ===== Result States ===== */
.result {
  display: none;
  padding: 20px 24px;
  border-radius: var(--r-md);
  margin-top: 24px;
  animation: fadeInUp 0.4s var(--ease-out);
}

.result.show {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.result--success {
  background: rgba(108, 192, 74, 0.08);
  border: 1px solid rgba(108, 192, 74, 0.2);
}

.result--error {
  background: rgba(247, 75, 94, 0.08);
  border: 1px solid rgba(247, 75, 94, 0.2);
}

.result__icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: grid;
  place-items: center;
}

.result--success .result__icon {
  background: rgba(108, 192, 74, 0.15);
  color: var(--clr-accent);
}

.result--error .result__icon {
  background: rgba(247, 75, 94, 0.15);
  color: var(--clr-danger);
}

.result__title {
  font-weight: 700;
  font-size: 0.9375rem;
  margin-bottom: 4px;
}

.result--success .result__title {
  color: var(--clr-accent);
}

.result--error .result__title {
  color: var(--clr-danger);
}

.result__text {
  font-size: 0.8125rem;
  color: var(--clr-text-muted);
  line-height: 1.5;
}

/* ===== Hash display ===== */
.hash-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: rgba(0, 0, 0, 0.25);
  border-radius: var(--r-sm);
  border: 1px solid var(--clr-card-border);
  margin-bottom: 24px;
}

.hash-row__label {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--clr-text-dim);
  flex-shrink: 0;
}

.hash-row__value {
  font-family: var(--ff-mono);
  font-size: 0.75rem;
  color: var(--clr-primary);
  word-break: break-all;
  flex: 1;
  user-select: all;
}

.hash-row__copy {
  background: none;
  border: none;
  color: var(--clr-text-muted);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  transition: color var(--t-fast);
  flex-shrink: 0;
}

.hash-row__copy:hover {
  color: var(--clr-primary);
}

/* ===== Footer ===== */
.footer {
  padding: 32px 0;
  border-top: 1px solid var(--clr-card-border);
  text-align: center;
}

.footer__text {
  font-size: 0.8125rem;
  color: var(--clr-text-dim);
}

.footer__link {
  color: var(--clr-primary);
  text-decoration: none;
  transition: color var(--t-fast);
}

.footer__link:hover {
  color: var(--clr-accent);
}

/* ===== Lightbox ===== */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0, 0, 0, 0.9);
  backdrop-filter: blur(12px);
  display: none;
  place-items: center;
  padding: 40px;
  cursor: zoom-out;
}

.lightbox.open {
  display: grid;
  animation: fadeIn 0.3s var(--ease-out);
}

.lightbox img {
  max-width: 90%;
  max-height: 90vh;
  border-radius: var(--r-md);
  box-shadow: 0 0 80px rgba(0, 0, 0, 0.6);
}

.lightbox__close {
  position: absolute;
  top: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--clr-text);
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: background var(--t-fast);
}

.lightbox__close:hover {
  background: rgba(255, 255, 255, 0.15);
}

/* ===== Loading spinner ===== */
.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255, 255, 255, 0.15);
  border-top-color: var(--clr-primary);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

/* ===== Toast ===== */
.toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(120px);
  padding: 12px 24px;
  border-radius: var(--r-sm);
  background: var(--clr-surface-alt);
  border: 1px solid var(--clr-card-border);
  color: var(--clr-text);
  font-size: 0.875rem;
  font-weight: 500;
  z-index: 300;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  transition: transform var(--t-med) var(--ease-out), opacity var(--t-med);
  opacity: 0;
  pointer-events: none;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
  pointer-events: auto;
}

/* ===== Animations ===== */
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.4; }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ===== Mobile Responsive ===== */
@media (max-width: 768px) {
  .navbar {
    padding: 12px 16px;
  }

  .navbar__links {
    display: none;
  }

  .hero {
    padding: 64px 0 40px;
  }

  .cert-card__header {
    flex-direction: column;
    gap: 12px;
    align-items: flex-start;
  }

  .details__grid {
    grid-template-columns: 1fr 1fr;
  }

  .btn-row {
    flex-direction: column;
    align-items: stretch;
  }

  .btn-row .btn {
    justify-content: center;
  }

  .verify__tabs {
    flex-direction: column;
  }

  .verify__tab::after {
    bottom: 0;
    left: 0;
    right: auto;
    top: 0;
    width: 2px;
    height: auto;
  }
}

@media (max-width: 480px) {
  .details__grid {
    grid-template-columns: 1fr;
  }
}