/* ═══════════════════════════════════════════════════════
   SHSID Peer Advisors — Design System v2
   Inspired by Linear · Vercel · Stripe
   Themes: dark (default) · light
   ═══════════════════════════════════════════════════════ */

/* ── DARK THEME (default) ───────────────────────────── */
:root {
  --c-bg:          #0d0d0d;
  --c-bg2:         #141414;
  --c-surface:     rgba(255,255,255,0.04);
  --c-surface2:    rgba(255,255,255,0.07);
  --c-border:      rgba(255,255,255,0.08);
  --c-border2:     rgba(255,255,255,0.15);

  --c-text:        #f4f4f5;
  --c-text2:       rgba(244,244,245,0.55);
  --c-text3:       rgba(244,244,245,0.32);

  --c-accent:      #8b5cf6;
  --c-accent2:     #a78bfa;
  --c-accent-bg:   rgba(139,92,246,0.12);
  --c-accent-glow: rgba(139,92,246,0.3);

  --c-green:       #10b981;  --c-green-bg:  rgba(16,185,129,0.14);
  --c-yellow:      #f59e0b;  --c-yellow-bg: rgba(245,158,11,0.14);
  --c-red:         #ef4444;  --c-red-bg:    rgba(239,68,68,0.14);
  --c-blue:        #3b82f6;  --c-blue-bg:   rgba(59,130,246,0.12);

  --nav-bg:              rgba(13,13,13,0.82);
  --nav-border:          rgba(255,255,255,0.07);

  --card-bg:             rgba(255,255,255,0.03);
  --card-border:         rgba(255,255,255,0.07);
  --card-hover-bg:       rgba(255,255,255,0.055);
  --card-hover-border:   rgba(255,255,255,0.12);

  --input-bg:            rgba(255,255,255,0.04);
  --input-border:        rgba(255,255,255,0.1);
  --input-placeholder:   rgba(244,244,245,0.28);

  --modal-bg:            #141414;
  --modal-shadow:        0 24px 80px rgba(0,0,0,0.9), 0 0 0 1px rgba(255,255,255,0.07);

  --scroll-thumb:        rgba(255,255,255,0.1);
  --scroll-thumb-hover:  rgba(255,255,255,0.2);
}

/* ── PINK THEME ─────────────────────────────────────── */
[data-theme="pink"] {
  --c-bg:          #fff0f5;
  --c-bg2:         #fffde7;
  --c-surface:     rgba(240,98,146,0.05);
  --c-surface2:    rgba(240,98,146,0.09);
  --c-border:      rgba(240,98,146,0.18);
  --c-border2:     rgba(240,98,146,0.32);

  --c-text:        #3d1a27;
  --c-text2:       rgba(61,26,39,0.6);
  --c-text3:       rgba(61,26,39,0.35);

  --c-accent:      #e91e8c;
  --c-accent2:     #f06292;
  --c-accent-bg:   rgba(233,30,140,0.08);
  --c-accent-glow: rgba(233,30,140,0.28);

  --c-green:       #2e7d32;  --c-green-bg:  rgba(46,125,50,0.1);
  --c-yellow:      #f57f17;  --c-yellow-bg: rgba(245,127,23,0.1);
  --c-red:         #c62828;  --c-red-bg:    rgba(198,40,40,0.1);
  --c-blue:        #1565c0;  --c-blue-bg:   rgba(21,101,192,0.1);

  --nav-bg:              rgba(255,240,245,0.92);
  --nav-border:          rgba(240,98,146,0.15);

  --card-bg:             #fff8fb;
  --card-border:         rgba(240,98,146,0.14);
  --card-hover-bg:       #fff0f5;
  --card-hover-border:   rgba(240,98,146,0.28);

  --input-bg:            #fff8fb;
  --input-border:        rgba(240,98,146,0.22);
  --input-placeholder:   rgba(61,26,39,0.3);

  --modal-bg:            #fff5f8;
  --modal-shadow:        0 24px 80px rgba(233,30,140,0.12), 0 0 0 1px rgba(240,98,146,0.14);

  --scroll-thumb:        rgba(240,98,146,0.18);
  --scroll-thumb-hover:  rgba(240,98,146,0.32);
}

/* ── LIGHT THEME ────────────────────────────────────── */
[data-theme="light"] {
  --c-bg:          #ffffff;
  --c-bg2:         #f8f9fa;
  --c-surface:     rgba(0,0,0,0.025);
  --c-surface2:    rgba(0,0,0,0.045);
  --c-border:      rgba(0,0,0,0.08);
  --c-border2:     rgba(0,0,0,0.16);

  --c-text:        #09090b;
  --c-text2:       rgba(9,9,11,0.56);
  --c-text3:       rgba(9,9,11,0.32);

  --c-accent:      #6366f1;
  --c-accent2:     #818cf8;
  --c-accent-bg:   rgba(99,102,241,0.08);
  --c-accent-glow: rgba(99,102,241,0.25);

  --c-green:       #059669;  --c-green-bg:  rgba(5,150,105,0.1);
  --c-yellow:      #d97706;  --c-yellow-bg: rgba(217,119,6,0.1);
  --c-red:         #dc2626;  --c-red-bg:    rgba(220,38,38,0.1);
  --c-blue:        #2563eb;  --c-blue-bg:   rgba(37,99,235,0.1);

  --nav-bg:              rgba(255,255,255,0.88);
  --nav-border:          rgba(0,0,0,0.07);

  --card-bg:             #ffffff;
  --card-border:         rgba(0,0,0,0.07);
  --card-hover-bg:       #f8f9fa;
  --card-hover-border:   rgba(0,0,0,0.12);

  --input-bg:            #ffffff;
  --input-border:        rgba(0,0,0,0.12);
  --input-placeholder:   rgba(9,9,11,0.3);

  --modal-bg:            #ffffff;
  --modal-shadow:        0 24px 80px rgba(0,0,0,0.12), 0 0 0 1px rgba(0,0,0,0.07);

  --scroll-thumb:        rgba(0,0,0,0.12);
  --scroll-thumb-hover:  rgba(0,0,0,0.22);
}

/* ── RESET ──────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--c-bg);
  color: var(--c-text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.65;
  min-height: 100vh;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* ── SCROLLBAR ──────────────────────────────────────── */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--scroll-thumb); border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: var(--scroll-thumb-hover); }

/* ── NAVIGATION ─────────────────────────────────────── */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: 64px;
  background: var(--nav-bg);
  border-bottom: 1px solid var(--nav-border);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  display: flex;
  align-items: center;
  padding: 0 clamp(1rem, 3vw, 2rem);
  gap: 0.5rem;
  transition: background 0.3s, border-color 0.3s;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  flex-shrink: 0;
}

.nav-icon-img {
  width: 30px;
  height: 30px;
  border-radius: 7px;
  object-fit: cover;
}

.nav-brand {
  font-size: 0.93rem;
  font-weight: 700;
  color: var(--c-text);
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.nav-spacer { flex: 1; }

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.2rem;
}

.nav-link {
  padding: 0.38rem 0.72rem;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--c-text2);
  text-decoration: none;
  transition: color 0.15s, background 0.15s;
  white-space: nowrap;
}
.nav-link:hover {
  color: var(--c-text);
  background: var(--c-surface2);
}

/* ── BUTTONS ────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.48rem 1.05rem;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  font-family: inherit;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all 0.18s cubic-bezier(0.4,0,0.2,1);
  letter-spacing: -0.01em;
  white-space: nowrap;
}
.btn:active { transform: scale(0.97) !important; }

.btn-primary {
  background: var(--c-accent);
  color: #fff;
}
.btn-primary:hover {
  filter: brightness(1.12);
  box-shadow: 0 4px 24px var(--c-accent-glow);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--c-text2);
  border: 1px solid var(--c-border);
}
.btn-ghost:hover {
  background: var(--c-surface2);
  border-color: var(--c-border2);
  color: var(--c-text);
  transform: translateY(-1px);
}

.btn-lg {
  padding: 0.7rem 1.65rem;
  font-size: 0.925rem;
  border-radius: 10px;
}

/* ── THEME TOGGLE ───────────────────────────────────── */
.theme-btn {
  width: 34px;
  height: 34px;
  border-radius: 7px;
  border: 1px solid var(--c-border);
  background: var(--c-surface);
  color: var(--c-text2);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-family: inherit;
  transition: all 0.18s ease;
  margin-left: 0.2rem;
  flex-shrink: 0;
}
.theme-btn:hover {
  background: var(--c-surface2);
  border-color: var(--c-border2);
  color: var(--c-text);
}

/* ── BADGES ─────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.55rem;
  border-radius: 5px;
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  white-space: nowrap;
}
.badge-beginner     { background: var(--c-green-bg);  color: var(--c-green);  }
.badge-intermediate { background: var(--c-yellow-bg); color: var(--c-yellow); }
.badge-advanced     { background: var(--c-red-bg);    color: var(--c-red);    }
.badge-default      { background: var(--c-surface2);  color: var(--c-text2);  }

/* ── FORM INPUTS ────────────────────────────────────── */
.form-label {
  display: block;
  font-size: 0.73rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--c-text2);
  margin-bottom: 0.35rem;
}

.form-input {
  width: 100%;
  padding: 0.65rem 0.85rem;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: 9px;
  color: var(--c-text);
  font-size: 0.9rem;
  font-family: inherit;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.form-input:focus {
  outline: none;
  border-color: var(--c-accent);
  box-shadow: 0 0 0 3px var(--c-accent-bg);
}
.form-input::placeholder { color: var(--input-placeholder); }

.full-btn {
  width: 100%;
  padding: 0.75rem;
  background: var(--c-accent);
  color: #fff;
  border: none;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  letter-spacing: -0.01em;
  transition: filter 0.18s, transform 0.18s, box-shadow 0.18s;
}
.full-btn:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
  box-shadow: 0 6px 24px var(--c-accent-glow);
}
.full-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none !important;
  filter: none !important;
}

/* ── FOOTER ─────────────────────────────────────────── */
footer {
  text-align: center;
  padding: 3rem 2rem;
  border-top: 1px solid var(--c-border);
  color: var(--c-text3);
  font-size: 0.8rem;
  margin-top: 6rem;
}

/* ── MOBILE ─────────────────────────────────────────── */
@media (max-width: 600px) {
  nav { padding: 0 1rem; }
  .nav-brand { display: none; }
  .btn-lg { padding: 0.65rem 1.3rem; }
}