:root {
  --bg:        #0d1117;
  --surface:   #161b22;
  --surface-2: #1e2530;
  --border:    #2a3140;
  --accent:    #f5a623;
  --green:     #2ea84b;
  --red:       #dc2626;
  --teal:      #459bac;
  --text:      #e1e3e7;
  --text-dim:  #8b949e;
  --font-head: 'Barlow Condensed', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;
  --r: 12px;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-head);
  -webkit-tap-highlight-color: transparent;
}
body { display: flex; flex-direction: column; }

/* Header */
.header {
  display: flex; align-items: center; gap: 14px;
  padding: 16px 20px;
  background: var(--surface);
  border-bottom: 2px solid var(--accent);
}
.brand { font-size: 28px; font-weight: 800; letter-spacing: 1px; }
.brand-info { color: #00cfff; }
.brand-borne { color: #39d353; }
.header-title { font-size: 22px; font-weight: 600; color: var(--text-dim); }

/* Main content */
.main { flex: 1; padding: 20px; max-width: 600px; margin: 0 auto; width: 100%; overflow-y: auto; }

/* Home screen — two big buttons */
.home-grid { display: flex; flex-direction: column; gap: 20px; margin-top: 30px; }
.home-btn {
  display: flex; align-items: center; gap: 16px;
  padding: 28px 24px;
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--r);
  cursor: pointer;
  transition: border-color 0.2s, transform 0.1s;
  -webkit-tap-highlight-color: transparent;
}
.home-btn:active { transform: scale(0.98); border-color: var(--accent); }
.home-btn .icon { font-size: 48px; }
.home-btn .label { font-size: 26px; font-weight: 700; color: var(--text); }
.home-btn .desc { font-size: 15px; font-weight: 400; color: var(--text-dim); margin-top: 4px; }

/* Screens */
.screen { display: none; }
.screen.active { display: block; }

/* Back button */
.back-btn {
  display: inline-flex; align-items: center; gap: 6px;
  background: none; border: none; color: var(--teal);
  font-family: var(--font-head); font-size: 18px; font-weight: 600;
  cursor: pointer; padding: 8px 0; margin-bottom: 16px;
}

/* Form elements */
.form-group { margin-bottom: 20px; }
.form-label {
  display: block; font-size: 16px; font-weight: 600;
  color: var(--text-dim); margin-bottom: 8px;
  letter-spacing: 0.04em; text-transform: uppercase;
}

/* Source picker — big buttons */
.source-grid { display: flex; flex-direction: column; gap: 10px; }
.source-btn {
  display: flex; align-items: center; gap: 12px;
  padding: 18px 16px;
  background: var(--surface-2); border: 2px solid var(--border);
  border-radius: var(--r); cursor: pointer;
  font-family: var(--font-head); font-size: 20px; font-weight: 600;
  color: var(--text); transition: border-color 0.15s;
}
.source-btn:active, .source-btn.selected { border-color: var(--accent); }
.source-btn.selected { background: #1e2a1e; border-color: var(--green); }
.source-btn .s-icon { font-size: 28px; }

/* Sac counter */
.sac-counter {
  display: flex; align-items: center;
  background: var(--surface-2); border: 2px solid var(--teal);
  border-radius: var(--r); overflow: hidden;
}
.sac-btn {
  width: 80px; height: 80px; background: none; border: none;
  color: var(--accent); font-size: 44px; font-weight: 700;
  cursor: pointer; font-family: var(--font-mono);
  transition: background 0.1s; flex-shrink: 0;
}
.sac-btn:active { background: rgba(245,166,35,0.18); }
.sac-count-input {
  flex: 1; text-align: center; background: none; border: none; outline: none;
  font-family: var(--font-mono); font-size: 54px; font-weight: 600;
  color: var(--text); line-height: 1; width: 0; min-width: 0;
  -moz-appearance: textfield;
}
.sac-count-input::-webkit-inner-spin-button,
.sac-count-input::-webkit-outer-spin-button { -webkit-appearance: none; }
.sac-auto-weight {
  text-align: center; font-size: 15px; color: var(--text-dim);
  margin-top: 10px; font-family: var(--font-mono); letter-spacing: 0.03em;
}
.poids-override-label {
  display: block; font-size: 15px; color: var(--text-dim);
  margin-bottom: 6px; font-style: italic;
}

/* Number input — big for tablet */
.big-input {
  width: 100%; padding: 16px;
  background: var(--surface-2); border: 2px solid var(--teal);
  border-radius: var(--r); color: var(--text);
  font-family: var(--font-mono); font-size: 28px; font-weight: 600;
  text-align: center; outline: none;
  -moz-appearance: textfield;
}
.big-input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(245,166,35,0.25); }
.big-input::placeholder { color: var(--text-dim); font-size: 20px; }
.big-input::-webkit-inner-spin-button,
.big-input::-webkit-outer-spin-button { -webkit-appearance: none; }

/* Text input */
.text-input {
  width: 100%; padding: 14px;
  background: var(--surface-2); border: 2px solid var(--border);
  border-radius: var(--r); color: var(--text);
  font-family: var(--font-head); font-size: 18px;
  outline: none;
}
.text-input:focus { border-color: var(--teal); }
.text-input::placeholder { color: var(--text-dim); }

/* Submit button */
.submit-btn {
  width: 100%; padding: 18px;
  background: var(--green); border: none; border-radius: var(--r);
  color: #fff; font-family: var(--font-head);
  font-size: 22px; font-weight: 700; letter-spacing: 0.04em;
  cursor: pointer; transition: opacity 0.15s;
}
.submit-btn:active { opacity: 0.85; }
.submit-btn:disabled { opacity: 0.4; cursor: default; }

/* Tournée picker */
.tournee-list { display: flex; flex-direction: column; gap: 10px; }
.tournee-card {
  padding: 16px; background: var(--surface-2);
  border: 2px solid var(--border); border-radius: var(--r);
  cursor: pointer; transition: border-color 0.15s;
}
.tournee-card:active, .tournee-card.selected { border-color: var(--accent); }
.tournee-card.selected { background: #1e2530; }
.tournee-card .t-name { font-size: 20px; font-weight: 700; }
.tournee-card .t-meta { font-size: 14px; color: var(--text-dim); margin-top: 4px; font-family: var(--font-mono); }
.tournee-card .t-pese { color: var(--green); font-weight: 600; margin-top: 4px; font-size: 14px; }

/* Pesée method */
.method-grid { display: flex; flex-wrap: wrap; gap: 8px; }
.method-btn {
  flex: 1; min-width: 120px; padding: 12px 8px;
  background: var(--surface-2); border: 2px solid var(--border);
  border-radius: var(--r); color: var(--text);
  font-family: var(--font-head); font-size: 15px; font-weight: 600;
  text-align: center; cursor: pointer;
}
.method-btn.selected { border-color: var(--accent); background: #252218; }

/* Success message */
.success-msg {
  padding: 20px; background: #162416;
  border: 2px solid var(--green); border-radius: var(--r);
  text-align: center;
}
.success-msg .check { font-size: 48px; display: block; margin-bottom: 12px; }
.success-msg .msg { font-size: 20px; font-weight: 600; }
.success-msg .detail { font-size: 16px; color: var(--text-dim); margin-top: 8px; font-family: var(--font-mono); }

/* History list */
.history-title { font-size: 18px; font-weight: 700; color: var(--text-dim); margin: 24px 0 12px; text-transform: uppercase; letter-spacing: 0.06em; }
.history-item {
  display: flex; justify-content: space-between; align-items: center;
  padding: 12px 14px; background: var(--surface);
  border: 1px solid var(--border); border-radius: 8px; margin-bottom: 8px;
}
.history-item .h-source { font-size: 16px; font-weight: 600; }
.history-item .h-detail { font-size: 15px; color: var(--text-dim); }
.history-item .h-weight { font-family: var(--font-mono); font-size: 18px; font-weight: 600; color: var(--accent); }
.history-item .h-date { font-size: 15px; color: var(--text-dim); font-family: var(--font-mono); }

/* Error */
.error-msg { color: var(--red); font-size: 15px; font-weight: 600; margin-top: 8px; }

/* Loading */
.loading { text-align: center; padding: 30px; color: var(--text-dim); font-size: 18px; }

/* Scroll-to-top */
.scroll-top-btn {
  position: fixed; bottom: 24px; right: 20px;
  width: 48px; height: 48px; border-radius: 50%;
  background: var(--accent); border: none; color: #000;
  font-size: 22px; cursor: pointer; display: none;
  align-items: center; justify-content: center;
  box-shadow: 0 4px 12px rgba(0,0,0,0.4);
  z-index: 100; transition: opacity 0.2s;
}
.scroll-top-btn.visible { display: flex; }