/* =============================================
   Assignment 2 — Squat Counter Style
   ============================================= */

@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@300;400;500;600;700&family=DM+Mono:wght@400;500&display=swap');

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

:root {
  --bg:      #f6f5f0;
  --surface: #ffffff;
  --surface2:#f0eeea;
  --border:  #e4e2dc;
  --accent:  #16a34a;
  --accent2: #dc2626;
  --blue:    #2563eb;
  --text:    #18181b;
  --text2:   #71717a;
  --text3:   #a1a1aa;
  --shadow-sm: 0 1px 4px rgba(0,0,0,.06);
  --shadow:  0 4px 24px rgba(0,0,0,.08);
  --shadow-lg:0 12px 48px rgba(22,163,74,.14);
  --radius:  16px;
  --radius-sm:10px;
}

html, body { height:100%; font-family:'DM Sans',sans-serif; background:var(--bg); color:var(--text); -webkit-font-smoothing:antialiased; }

/* Header */
.app-header { display:flex; align-items:center; justify-content:space-between; padding:0 2rem; height:64px; background:var(--surface); border-bottom:1px solid var(--border); box-shadow:var(--shadow-sm); position:sticky; top:0; z-index:100; }
.header-logo { display:flex; align-items:center; gap:.65rem; }
.logo-icon { font-size:1.4rem; }
.logo-text { font-size:1.05rem; font-weight:600; letter-spacing:-.01em; }
.logo-text em { font-style:normal; color:var(--accent); }
.header-nav { display:flex; gap:.25rem; }
.nav-link { text-decoration:none; color:var(--text2); font-size:.875rem; font-weight:500; padding:.4rem .85rem; border-radius:8px; transition:background .15s, color .15s; }
.nav-link:hover { background:var(--surface2); color:var(--text); }
.nav-link.active { background:var(--accent); color:#fff; }

/* Layout */
.main-content { display:grid; grid-template-columns:1fr 300px; gap:1.5rem; padding:1.5rem 2rem; max-width:1200px; margin:0 auto; min-height:calc(100vh - 64px); }

/* Video */
.video-panel { display:flex; align-items:flex-start; justify-content:center; }
.video-container { position:relative; width:100%; max-width:660px; border-radius:var(--radius); overflow:hidden; background:#0a0f0a; box-shadow:var(--shadow-lg); aspect-ratio:4/3; }
.video-container video, .video-container canvas { position:absolute; inset:0; width:100%; height:100%; object-fit:cover; }
.video-container canvas { z-index:2; }
.video-overlay { position:absolute; inset:0; z-index:10; display:flex; flex-direction:column; align-items:center; justify-content:center; gap:1rem; background:rgba(250,249,246,.93); backdrop-filter:blur(8px); color:var(--text2); font-size:.9rem; transition:opacity .4s; }
.video-overlay.hidden { opacity:0; pointer-events:none; }
.spinner { width:40px; height:40px; border:3px solid var(--border); border-top-color:var(--accent); border-radius:50%; animation:spin .8s linear infinite; }
@keyframes spin { to { transform:rotate(360deg); } }
.corner { position:absolute; width:20px; height:20px; z-index:3; pointer-events:none; }
.corner.tl { top:12px; left:12px; border-top:2px solid rgba(255,255,255,.5); border-left:2px solid rgba(255,255,255,.5); border-radius:4px 0 0 0; }
.corner.tr { top:12px; right:12px; border-top:2px solid rgba(255,255,255,.5); border-right:2px solid rgba(255,255,255,.5); border-radius:0 4px 0 0; }
.corner.bl { bottom:12px; left:12px; border-bottom:2px solid rgba(255,255,255,.5); border-left:2px solid rgba(255,255,255,.5); border-radius:0 0 0 4px; }
.corner.br { bottom:12px; right:12px; border-bottom:2px solid rgba(255,255,255,.5); border-right:2px solid rgba(255,255,255,.5); border-radius:0 0 4px 0; }

/* Posture badge on video */
.posture-badge { position:absolute; top:14px; left:50%; transform:translateX(-50%); z-index:5; background:rgba(0,0,0,.55); backdrop-filter:blur(6px); color:#fff; font-size:.95rem; font-weight:700; letter-spacing:.08em; padding:.35rem 1.1rem; border-radius:99px; transition:background .3s; }
.posture-badge.up   { background:rgba(22,163,74,.85); }
.posture-badge.down { background:rgba(220,38,38,.85); }

/* Control panel */
.control-panel { display:flex; flex-direction:column; gap:1rem; }

/* Rep hero */
.rep-hero { background:linear-gradient(135deg,#16a34a,#15803d); border-radius:var(--radius); padding:1.5rem 1.25rem; display:flex; flex-direction:column; align-items:center; gap:.5rem; box-shadow:0 8px 32px rgba(22,163,74,.25); position:relative; overflow:hidden; }
.rep-hero::before { content:''; position:absolute; inset:0; background:url("data:image/svg+xml,%3Csvg width='60' height='60' xmlns='http://www.w3.org/2000/svg'%3E%3Ccircle cx='30' cy='30' r='29' fill='none' stroke='rgba(255,255,255,.08)' stroke-width='1'/%3E%3C/svg%3E") repeat; opacity:.4; }
.rep-label { font-size:.7rem; font-weight:700; letter-spacing:.14em; color:rgba(255,255,255,.75); }
.rep-count { font-size:5rem; font-weight:700; color:#fff; line-height:1; font-family:'DM Mono',monospace; }
.reset-btn { background:rgba(255,255,255,.2); border:1px solid rgba(255,255,255,.3); color:#fff; border-radius:8px; padding:.35rem 1.2rem; font-size:.8rem; font-weight:600; cursor:pointer; transition:background .18s; }
.reset-btn:hover { background:rgba(255,255,255,.3); }

/* Posture card */
.posture-card { background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-sm); padding:.9rem 1.1rem; display:flex; justify-content:space-between; align-items:center; box-shadow:var(--shadow-sm); }
.posture-label { font-size:.78rem; font-weight:700; letter-spacing:.06em; text-transform:uppercase; color:var(--text3); }
.posture-val { font-size:1.2rem; font-weight:700; color:var(--text); padding:.25rem .9rem; border-radius:8px; background:var(--surface2); transition:background .3s, color .3s; }
.posture-val.up   { background:#dcfce7; color:#15803d; }
.posture-val.down { background:#fee2e2; color:#dc2626; }

/* Stats */
.stats-grid { display:grid; grid-template-columns:1fr 1fr; gap:.65rem; }
.stat-card { background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-sm); padding:.8rem 1rem; display:flex; flex-direction:column; gap:.2rem; box-shadow:var(--shadow-sm); }
.stat-label { font-size:.7rem; font-weight:600; letter-spacing:.06em; text-transform:uppercase; color:var(--text3); }
.stat-value { font-size:1.05rem; font-weight:600; color:var(--text); }
.stat-value.mono { font-family:'DM Mono',monospace; }

/* Controls */
.control-group { display:flex; flex-direction:column; gap:.5rem; }
.control-label { font-size:.78rem; font-weight:600; letter-spacing:.04em; text-transform:uppercase; color:var(--text2); }
.slider-row { display:flex; align-items:center; gap:.75rem; }
input[type=range] { flex:1; -webkit-appearance:none; height:5px; background:var(--border); border-radius:99px; outline:none; }
input[type=range]::-webkit-slider-thumb { -webkit-appearance:none; width:18px; height:18px; background:var(--accent); border-radius:50%; cursor:pointer; }
.slider-val { font-family:'DM Mono',monospace; font-size:.82rem; font-weight:500; color:var(--accent); min-width:36px; text-align:right; }

/* History */
.history-card { background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-sm); padding:1rem; box-shadow:var(--shadow-sm); flex:1; overflow-y:auto; max-height:260px; }
.list-title { font-size:.78rem; font-weight:700; letter-spacing:.05em; text-transform:uppercase; color:var(--text2); margin-bottom:.75rem; }
.history-list { display:flex; flex-direction:column; gap:.35rem; }
.history-empty { font-size:.82rem; color:var(--text3); text-align:center; padding:.5rem; }
.history-item { display:flex; justify-content:space-between; align-items:center; padding:.35rem .65rem; background:var(--surface2); border-radius:7px; font-size:.8rem; }
.h-rep { font-weight:700; color:var(--accent); font-family:'DM Mono',monospace; }
.h-angle { color:var(--text2); font-family:'DM Mono',monospace; }
.h-time { color:var(--text3); font-size:.72rem; }

@media (max-width:860px) { .main-content { grid-template-columns:1fr; } }
@media (max-width:540px) { .app-header { padding:0 1rem; } .main-content { padding:1rem; } }