/* ============================================================
   1. DESIGN TOKENS
   ============================================================ */

:root {
  /* Fond & surfaces — noir profond */
  --c-bg:         #030307;
  --c-surface:    #08080f;
  --c-raised:     #0f0f1a;
  --c-border:     rgba(255, 255, 255, 0.06);
  --c-border-h:   rgba(98, 210, 200, 0.35);

  /* Accent — vert d'eau */
  --c-accent:     #62d2c8;
  --c-accent-dim: rgba(98, 210, 200, 0.07);
  --c-accent-mid: rgba(98, 210, 200, 0.18);

  /* Texte — blanc froid, très fin */
  --c-text:       #f2f4f8;
  --c-text-2:     rgba(242, 244, 248, 0.40);
  --c-text-3:     rgba(242, 244, 248, 0.15);

  /* États */
  --c-ok:         #62d2c8;
  --c-err:        #e05c6a;

  /* Typographie */
  --font-ui:      'Outfit', system-ui, sans-serif;

  /* Rayons — plus anguleux, plus tech */
  --r-xl: 18px;
  --r-lg: 12px;
  --r-md: 8px;
  --r-sm: 4px;

  /* Transitions */
  --ease:   cubic-bezier(0.4, 0, 0.2, 1);
  --t-fast: 0.16s;
  --t-mid:  0.28s;
}

[data-theme="light"] {
  --c-bg:         #f0f2f5;
  --c-surface:    #ffffff;
  --c-raised:     #e8ecf0;
  --c-border:     rgba(0, 0, 0, 0.08);
  --c-border-h:   rgba(30, 160, 152, 0.40);
  --c-accent:     #1ea098;
  --c-accent-dim: rgba(30, 160, 152, 0.07);
  --c-accent-mid: rgba(30, 160, 152, 0.14);
  --c-text:       #0a0c10;
  --c-text-2:     rgba(10, 12, 16, 0.45);
  --c-text-3:     rgba(10, 12, 16, 0.18);
  --c-ok:         #1ea098;
  --c-err:        #c84050;
}

/* ============================================================
   2. RESET & BASE  (mobile first)
   ============================================================ */

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  touch-action: manipulation;
}

body {
  background-color: var(--c-bg);
  color: var(--c-text);
  font-family: var(--font-ui);
  font-weight: 300;
  line-height: 1.55;
  min-height: 100dvh;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 52px 16px 64px;
  transition:
    background-color var(--t-mid) var(--ease),
    color var(--t-mid) var(--ease);
}

/* Halo vert d'eau en haut — ambiance tech */
body::before {
  content: '';
  position: fixed;
  top: -120px;
  left: 50%;
  transform: translateX(-50%);
  width: 500px;
  height: 360px;
  background: radial-gradient(ellipse at center,
    rgba(98, 210, 200, 0.06) 0%,
    transparent 70%);
  pointer-events: none;
  z-index: 0;
}

[data-theme="light"] body::before { opacity: 0; }

/* ============================================================
   3. LAYOUT
   ============================================================ */

.page {
  position: relative;
  z-index: 1;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

@media (min-width: 600px) {
  body  { padding: 64px 24px 80px; }
  .page { max-width: 580px; gap: 26px; }
}

/* ============================================================
   4. THEME TOGGLE
   ============================================================ */

.theme-btn {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 100;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--c-border);
  background: var(--c-surface);
  color: var(--c-text-2);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  -webkit-tap-highlight-color: transparent;
  transition:
    color var(--t-fast) var(--ease),
    border-color var(--t-fast) var(--ease);
}

@media (min-width: 600px) {
  .theme-btn { top: 22px; right: 22px; }
  .theme-btn:hover {
    color: var(--c-accent);
    border-color: var(--c-border-h);
  }
}

.theme-btn__icon {
  width: 17px;
  height: 17px;
  flex-shrink: 0;
  position: absolute;
  transition: opacity var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}

[data-theme="dark"]  .theme-btn__icon--sun  { opacity: 1; transform: scale(1);   }
[data-theme="dark"]  .theme-btn__icon--moon { opacity: 0; transform: scale(0.6); }
[data-theme="light"] .theme-btn__icon--sun  { opacity: 0; transform: scale(0.6); }
[data-theme="light"] .theme-btn__icon--moon { opacity: 1; transform: scale(1);   }

/* ============================================================
   5. HERO / SALUTATION
   ============================================================ */

.hero {
  padding-top: 16px;
  animation: fadeUp 0.5s var(--ease) both;
}

@media (min-width: 600px) { .hero { padding-top: 24px; } }

.hero__eyebrow {
  font-size: 9px;
  font-weight: 400;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: 18px;
  opacity: 0.9;
}

/* Ligne de séparation fine — touche high-tech */
.hero__eyebrow::before {
  content: '';
  display: inline-block;
  width: 18px;
  height: 1px;
  background: var(--c-accent);
  vertical-align: middle;
  margin-right: 10px;
  opacity: 0.6;
}

.hero__greeting {
  font-family: var(--font-ui);
  font-size: 2.5rem;
  font-weight: 200;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--c-text);
  margin-bottom: 14px;
}

@media (min-width: 600px) {
  .hero__greeting {
    font-size: clamp(2.8rem, 5.5vw, 3.6rem);
  }
}

.hero__sub {
  font-size: 0.875rem;
  font-weight: 300;
  color: var(--c-text-2);
  line-height: 1.75;
  letter-spacing: 0.01em;
}

/* ============================================================
   6. DROP ZONE
   ============================================================ */

.drop-area {
  position: relative;
  border: 1px solid var(--c-border);
  border-radius: var(--r-xl);
  padding: 48px 20px 44px;
  text-align: center;
  cursor: pointer;
  overflow: hidden;
  -webkit-tap-highlight-color: transparent;
  transition:
    border-color var(--t-mid) var(--ease),
    background var(--t-mid) var(--ease);
  animation: fadeUp 0.5s 0.07s var(--ease) both;
}

@media (min-width: 600px) {
  .drop-area { padding: 56px 32px 52px; }
}

.drop-area:active {
  border-color: var(--c-border-h);
  background: var(--c-accent-dim);
}

@media (min-width: 600px) {
  .drop-area:hover,
  .drop-area:focus-visible {
    border-color: var(--c-border-h);
    background: var(--c-accent-dim);
    outline: none;
  }
}

.drop-area.is-over {
  border-color: var(--c-accent);
  background: var(--c-accent-dim);
}

/* Coin décoratif — détail high-tech */
.drop-area::after {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 32px; height: 32px;
  border-top: 1px solid var(--c-accent);
  border-left: 1px solid var(--c-accent);
  border-radius: var(--r-xl) 0 0 0;
  opacity: 0;
  transition: opacity var(--t-mid) var(--ease);
}

.drop-area::before {
  content: '';
  position: absolute;
  bottom: 0; right: 0;
  width: 32px; height: 32px;
  border-bottom: 1px solid var(--c-accent);
  border-right: 1px solid var(--c-accent);
  border-radius: 0 0 var(--r-xl) 0;
  opacity: 0;
  transition: opacity var(--t-mid) var(--ease);
}

.drop-area:active::after,
.drop-area:active::before,
.drop-area.is-over::after,
.drop-area.is-over::before { opacity: 1; }

@media (min-width: 600px) {
  .drop-area:hover::after,
  .drop-area:hover::before { opacity: 1; }
}

.drop-area__glow {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 0%,
    rgba(98, 210, 200, 0.06) 0%,
    transparent 65%);
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--t-mid) var(--ease);
}

.drop-area:active .drop-area__glow,
.drop-area.is-over .drop-area__glow { opacity: 1; }

@media (min-width: 600px) {
  .drop-area:hover .drop-area__glow { opacity: 1; }
}

.drop-area__content {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  pointer-events: none;
}

.drop-area__icon {
  width: 44px;
  height: 44px;
  color: var(--c-accent);
  margin-bottom: 8px;
  animation: float 5s ease-in-out infinite;
  opacity: 0.85;
}

.drop-area__icon svg { width: 100%; height: 100%; }

.drop-area__label {
  font-size: 0.95rem;
  font-weight: 300;
  color: var(--c-text);
  letter-spacing: 0.02em;
}

.drop-area__label--mobile  { display: block; }
.drop-area__label--desktop { display: none;  }

@media (min-width: 600px) {
  .drop-area__label--mobile  { display: none;  }
  .drop-area__label--desktop { display: block; }
}

.drop-area__hint {
  font-size: 0.78rem;
  font-weight: 300;
  color: var(--c-text-2);
  letter-spacing: 0.03em;
}

/* ============================================================
   7. FILE LIST
   ============================================================ */

.file-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.file-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 13px 14px;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  transition: border-color var(--t-fast) var(--ease);
  animation: slideIn 0.2s var(--ease) both;
}

@media (min-width: 600px) {
  .file-item { gap: 14px; padding: 12px 16px; }
}

.file-item--done  { border-color: rgba(98, 210, 200, 0.20); }
.file-item--error { border-color: rgba(224, 92, 106, 0.20); }

.file-item__type {
  flex-shrink: 0;
  width: 34px;
  height: 34px;
  border-radius: var(--r-sm);
  background: var(--c-raised);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 8.5px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--c-text-3);
}

.file-item__type--img {
  background: var(--c-accent-dim);
  color: var(--c-accent);
}

.file-item__body {
  flex: 1;
  min-width: 0;
}

.file-item__name {
  font-size: 0.82rem;
  font-weight: 300;
  color: var(--c-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  letter-spacing: 0.01em;
}

.file-item__meta {
  font-size: 0.72rem;
  font-weight: 300;
  color: var(--c-text-2);
  margin-top: 2px;
  letter-spacing: 0.02em;
}

.file-item__status {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.file-item__status svg { width: 16px; height: 16px; }

.file-item--done  .file-item__status { color: var(--c-ok);  }
.file-item--error .file-item__status { color: var(--c-err); }

.spinner {
  width: 16px;
  height: 16px;
  border: 1.5px solid var(--c-border);
  border-top-color: var(--c-accent);
  border-radius: 50%;
  animation: spin 0.65s linear infinite;
}

/* ============================================================
   8. ACTIONS
   ============================================================ */

.actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
  animation: fadeUp 0.22s var(--ease) both;
}

@media (min-width: 480px) {
  .actions { flex-direction: row; gap: 10px; }
}

.send-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 15px 24px;
  /* Fond vert d'eau, texte sombre */
  background: var(--c-accent);
  color: #030307;
  border: none;
  border-radius: var(--r-md);
  font-family: var(--font-ui);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition:
    opacity var(--t-fast) var(--ease),
    transform var(--t-fast) var(--ease);
}

@media (min-width: 480px) {
  .send-btn { flex: 1; width: auto; }
}

.send-btn:active:not(:disabled) {
  opacity: 0.80;
  transform: scale(0.98);
}

@media (min-width: 600px) {
  .send-btn:hover:not(:disabled) {
    opacity: 0.85;
    transform: translateY(-1px);
  }
}

.send-btn:disabled {
  opacity: 0.30;
  cursor: not-allowed;
  transform: none;
}

.send-btn__count {
  font-size: 0.75rem;
  font-weight: 400;
  opacity: 0.65;
  letter-spacing: 0.04em;
}

.clear-btn {
  width: 100%;
  padding: 15px 20px;
  background: transparent;
  color: var(--c-text-2);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  font-family: var(--font-ui);
  font-size: 0.82rem;
  font-weight: 300;
  letter-spacing: 0.04em;
  cursor: pointer;
  text-align: center;
  -webkit-tap-highlight-color: transparent;
  transition:
    color var(--t-fast) var(--ease),
    border-color var(--t-fast) var(--ease);
}

@media (min-width: 480px) {
  .clear-btn { width: auto; flex-shrink: 0; }
}

.clear-btn:active {
  color: var(--c-text);
  border-color: var(--c-border-h);
}

@media (min-width: 600px) {
  .clear-btn:hover {
    color: var(--c-text);
    border-color: var(--c-border-h);
  }
}

/* ============================================================
   9. FEEDBACK
   ============================================================ */

.feedback {
  padding: 13px 16px;
  border-radius: var(--r-md);
  font-size: 0.83rem;
  font-weight: 300;
  line-height: 1.6;
  letter-spacing: 0.01em;
  animation: fadeUp 0.22s var(--ease) both;
}

.feedback--success {
  background: rgba(98, 210, 200, 0.07);
  border: 1px solid rgba(98, 210, 200, 0.20);
  color: var(--c-ok);
}

.feedback--error {
  background: rgba(224, 92, 106, 0.06);
  border: 1px solid rgba(224, 92, 106, 0.18);
  color: var(--c-err);
}

/* ============================================================
   10. ANIMATIONS
   ============================================================ */

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0);    }
}

@keyframes slideIn {
  from { opacity: 0; transform: translateX(-8px); }
  to   { opacity: 1; transform: translateX(0);    }
}

@keyframes float {
  0%,  100% { transform: translateY(0);    }
  50%        { transform: translateY(-5px); }
}

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