/* InstruMentor — Euphonium phase colors + gradients */

:root {
  --phase-setup: #d4af37;
  --phase-setup-light: #fdf8e8;
  --phase-setup-border: #e8d68a;
  --phase-foundations: #8b6914;
  --phase-foundations-light: #faf3e0;
  --phase-foundations-border: #c9a84c;
  --phase-tone: #b45309;
  --phase-tone-light: #fef3e2;
  --phase-tone-border: #e0a458;
  --phase-technique: #1c7a8c;
  --phase-technique-light: #e6f4f8;
  --phase-technique-border: #76d7c4;
  --phase-refinement: #6c3483;
  --phase-refinement-light: #f4ecf7;
  --phase-refinement-border: #bb8fce;
}

/* Hero gradient — warm brass tones */
.hero {
  background:
    radial-gradient(circle at 20% 30%, rgba(180,83,9,0.35) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(212,175,55,0.3) 0%, transparent 50%),
    conic-gradient(from 180deg at 50% 50%, #3d2000, #8b6914, #3d2000);
}
.hero::after { background: rgba(212,175,55,0.06); }

/* Body background */
body {
  background-image: radial-gradient(circle at 20% 80%, rgba(212,175,55,0.06) 0%, transparent 50%),
                     radial-gradient(circle at 80% 20%, rgba(180,83,9,0.04) 0%, transparent 50%);
}

/* Phase header gradients */
.phase-header.ph-setup { background: linear-gradient(135deg, #7a6520, #a08830); }
.phase-header.ph-foundations { background: linear-gradient(135deg, #5c4510, #8b6914); }
.phase-header.ph-tone { background: linear-gradient(135deg, #7a3a06, #b45309); }
.phase-header.ph-technique { background: linear-gradient(135deg, var(--primary), var(--primary-mid)); }
.phase-header.ph-refinement { background: linear-gradient(135deg, #4a235a, #6c3483); }

/* Phase-zone section header coloring */
.phase-setup-zone .section-header.ph-setup { border-left-color: var(--phase-setup); background: linear-gradient(90deg, rgba(212,175,55,0.1), transparent); }
.phase-setup-zone .section-header.ph-setup:hover { background: linear-gradient(90deg, rgba(212,175,55,0.18), rgba(212,175,55,0.03)); }
.phase-foundations-zone .section-header.ph-foundations { border-left-color: var(--phase-foundations); background: linear-gradient(90deg, rgba(139,105,20,0.1), transparent); }
.phase-foundations-zone .section-header.ph-foundations:hover { background: linear-gradient(90deg, rgba(139,105,20,0.18), rgba(139,105,20,0.03)); }
.phase-tone-zone .section-header.ph-tone { border-left-color: var(--phase-tone); background: linear-gradient(90deg, rgba(180,83,9,0.1), transparent); }
.phase-tone-zone .section-header.ph-tone:hover { background: linear-gradient(90deg, rgba(180,83,9,0.18), rgba(180,83,9,0.03)); }
.phase-technique-zone .section-header.ph-technique { border-left-color: var(--phase-technique); background: linear-gradient(90deg, rgba(28,122,140,0.1), transparent); }
.phase-technique-zone .section-header.ph-technique:hover { background: linear-gradient(90deg, rgba(28,122,140,0.18), rgba(28,122,140,0.03)); }
.phase-refinement-zone .section-header.ph-refinement { border-left-color: var(--phase-refinement); background: linear-gradient(90deg, rgba(108,52,131,0.08), transparent); }
.phase-refinement-zone .section-header.ph-refinement:hover { background: linear-gradient(90deg, rgba(108,52,131,0.15), rgba(108,52,131,0.03)); }

/* Instrument badge — warm brass */
.sidebar-header .instrument-badge {
  background: rgba(180,83,9,0.2); border-color: rgba(212,175,55,0.4); color: #e8d68a;
}