/**
 * InvestBuffet — Pure B&W Auth & Account Design System
 * Inspired by Proton Pass: pure black, glass cards, bold type, white accent
 */

:root {
  /* ── Core palette ─────────────────────────────────────────── */
  --c-bg:       #000000;
  --c-bg2:      #0a0a0a;
  --c-surface:  #111111;
  --c-surface2: #1a1a1a;
  --c-border:   rgba(255,255,255,0.07);
  --c-border2:  rgba(255,255,255,0.14);

  /* ── Type ─────────────────────────────────────────────────── */
  --c-text:     #f5f5f5;
  --c-text2:    #888888;
  --c-text3:    #444444;

  /* ── Accent (white) ──────────────────────────────────────── */
  --c-accent:      #ffffff;
  --c-accent-lt:   #cccccc;
  --c-accent-dim:  rgba(255,255,255,0.08);
  --c-accent-glow: rgba(255,255,255,0.10);

  /* ── Semantic ─────────────────────────────────────────────── */
  --c-green: #4ade80;
  --c-red:   #f87171;
  --c-blue:  #60a5fa;

  /* ── Geometry ─────────────────────────────────────────────── */
  --r-sm:  10px;
  --r-md:  16px;
  --r-lg:  24px;
  --r-xl:  32px;

  /* ── Typography ───────────────────────────────────────────── */
  --font: "Segoe UI","Noto Sans Thai",Tahoma,Arial,sans-serif;
}

/* ── Reset ───────────────────────────────────────────────────── */
*,*::before,*::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--c-bg);
  color: var(--c-text);
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }

/* ── Background canvas ────────────────────────────────────────── */
.bg-canvas {
  position: fixed; inset: 0; z-index: 0; pointer-events: none; overflow: hidden;
}
.bg-canvas::before {
  content: "";
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse 900px 600px at 20% -5%, rgba(255,255,255,0.03) 0%, transparent 55%),
    radial-gradient(ellipse 600px 400px at 85% 95%, rgba(255,255,255,0.02) 0%, transparent 50%);
}
/* subtle noise */
.bg-canvas::after {
  content: "";
  position: absolute; inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.025'/%3E%3C/svg%3E");
  background-size: 128px 128px;
  opacity: 0.4;
}

/* ── Navbar ─────────────────────────────────────────────────── */
.navbar {
  position: relative; z-index: 100;
  border-bottom: 1px solid var(--c-border);
  background: rgba(0,0,0,0.94);
  backdrop-filter: blur(24px);
}
.navbar-inner {
  display: flex; align-items: center; gap: 20px;
  height: 64px;
  width: min(1200px, 100% - 40px);
  margin-inline: auto;
}
.nav-logo { display: flex; align-items: center; gap: 10px; }
.nav-logo-icon {
  width: 36px; height: 36px; border-radius: 10px;
  background: #1a1a1a;
  border: 1px solid rgba(255,255,255,0.15);
  display: flex; align-items: center; justify-content: center;
  font-weight: 900; font-size: 0.9rem; color: #fff;
}
.nav-logo-text {
  font-size: 1.15rem; font-weight: 800; letter-spacing: -0.04em; color: var(--c-text);
}
.nav-logo-text span { color: var(--c-accent); }
.nav-spacer { flex: 1; }
.nav-cta { display: flex; align-items: center; gap: 10px; }

/* ── Buttons ────────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 9px 20px; border-radius: var(--r-sm);
  font-size: 0.875rem; font-weight: 700; cursor: pointer;
  transition: all 0.16s ease; white-space: nowrap; border: none;
  font-family: var(--font); letter-spacing: -0.01em;
}
.btn-ghost {
  color: var(--c-text2); background: transparent;
  border: 1px solid var(--c-border);
}
.btn-ghost:hover {
  color: var(--c-text); border-color: var(--c-border2);
  background: rgba(255,255,255,0.04);
}
.btn-primary {
  background: #ffffff;
  color: #000000;
  box-shadow: 0 2px 16px rgba(255,255,255,0.12);
}
.btn-primary:hover {
  transform: translateY(-1px);
  background: rgba(255,255,255,0.90);
  box-shadow: 0 4px 24px rgba(255,255,255,0.18);
}
.btn-primary:active { transform: translateY(0); }

.btn-full { width: 100%; padding: 14px; font-size: 0.96rem; border-radius: var(--r-sm); }

.btn-social {
  width: 100%; padding: 12px; border-radius: var(--r-sm);
  background: var(--c-surface2); border: 1px solid var(--c-border);
  color: var(--c-text2); font-size: 0.88rem; font-weight: 600;
  display: flex; align-items: center; justify-content: center; gap: 10px;
  cursor: pointer; transition: all 0.15s; font-family: var(--font);
}
.btn-social:hover { border-color: var(--c-border2); color: var(--c-text); background: rgba(255,255,255,0.04); }

/* ── Auth layout ─────────────────────────────────────────────── */
.auth-wrap {
  position: relative; z-index: 1; flex: 1;
  display: flex; align-items: center; justify-content: center;
  padding: 48px 20px;
}
.auth-card {
  width: min(440px, 100%);
  background: rgba(12,12,12,0.90);
  border: 1px solid var(--c-border);
  border-radius: var(--r-xl);
  padding: 44px 40px;
  backdrop-filter: blur(32px);
  box-shadow:
    0 0 0 1px rgba(255,255,255,0.03) inset,
    0 8px 40px rgba(0,0,0,0.7),
    0 2px 8px rgba(0,0,0,0.5);
}
.auth-logo { display: flex; align-items: center; gap: 10px; margin-bottom: 32px; }
.auth-logo-icon {
  width: 40px; height: 40px; border-radius: 11px;
  background: #1a1a1a;
  border: 1px solid rgba(255,255,255,0.15);
  display: flex; align-items: center; justify-content: center;
  font-weight: 900; font-size: 1rem; color: #fff;
}
.auth-logo-text { font-size: 1.2rem; font-weight: 800; letter-spacing: -0.04em; }
.auth-logo-text span { color: var(--c-accent); }
.auth-title { font-size: 1.7rem; font-weight: 800; letter-spacing: -0.035em; margin-bottom: 6px; line-height: 1.2; }
.auth-sub { font-size: 0.9rem; color: var(--c-text2); margin-bottom: 28px; line-height: 1.6; }

/* ── Form ───────────────────────────────────────────────────── */
.form-group { margin-bottom: 16px; }
label { display: block; font-size: 0.82rem; font-weight: 600; color: var(--c-text2); margin-bottom: 6px; letter-spacing: 0.01em; }
input[type=text], input[type=email], input[type=password] {
  width: 100%; padding: 12px 16px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--c-border);
  border-radius: var(--r-sm); color: var(--c-text);
  font-family: var(--font); font-size: 0.93rem;
  transition: border-color 0.15s, box-shadow 0.15s; outline: none;
}
input:focus {
  border-color: rgba(255,255,255,0.30);
  box-shadow: 0 0 0 3px rgba(255,255,255,0.05);
}
input::placeholder { color: var(--c-text3); }
.form-action { margin-top: 22px; }
.form-footer {
  margin-top: 20px; text-align: center;
  font-size: 0.84rem; color: var(--c-text2);
}
.form-footer a { color: var(--c-accent); font-weight: 600; }
.form-footer a:hover { color: var(--c-accent-lt); }

.auth-divider {
  display: flex; align-items: center; gap: 14px;
  margin: 20px 0; color: var(--c-text3); font-size: 0.78rem;
}
.auth-divider::before,.auth-divider::after { content:""; flex:1; height:1px; background: var(--c-border); }

.forgot-link {
  display: block; text-align: right; font-size: 0.8rem;
  color: var(--c-text3); margin-top: 5px; transition: color 0.15s;
}
.forgot-link:hover { color: var(--c-text2); }

/* ── Alerts ─────────────────────────────────────────────────── */
.alert { padding: 12px 16px; border-radius: var(--r-sm); font-size: 0.86rem; margin-bottom: 16px; display: none; }
.alert.show { display: flex; align-items: flex-start; gap: 10px; }
.alert-error { background: rgba(248,113,113,0.08); border: 1px solid rgba(248,113,113,0.20); color: #fca5a5; }
.alert-success { background: rgba(74,222,128,0.08); border: 1px solid rgba(74,222,128,0.20); color: #86efac; }

/* ── Loader ─────────────────────────────────────────────────── */
.btn-loading { position: relative; pointer-events: none; opacity: 0.7; }
.btn-loading::after {
  content: ""; position: absolute;
  width: 16px; height: 16px;
  border: 2px solid rgba(0,0,0,0.20);
  border-top-color: #000; border-radius: 50%;
  animation: spin 0.7s linear infinite;
  right: 14px; top: 50%; transform: translateY(-50%);
}
/* White loader for ghost buttons */
.btn-ghost.btn-loading::after {
  border: 2px solid rgba(255,255,255,0.20);
  border-top-color: #fff;
}
@keyframes spin { to { transform: translateY(-50%) rotate(360deg); } }

/* ── Nav user (shared across auth pages) ────────────────────── */
.nav-user-menu { position: relative; }
.nav-user-btn {
  display: flex; align-items: center; gap: 8px;
  padding: 7px 12px 7px 8px; border-radius: var(--r-sm);
  background: transparent; border: 1px solid var(--c-border);
  color: var(--c-text2); font-family: var(--font);
  font-size: 0.86rem; font-weight: 600; cursor: pointer; transition: all 0.15s;
}
.nav-user-btn:hover { border-color: var(--c-border2); color: var(--c-text); background: rgba(255,255,255,0.04); }
.nav-avatar {
  width: 26px; height: 26px; border-radius: 50%;
  background: #2a2a2a;
  border: 1px solid rgba(255,255,255,0.15);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.72rem; font-weight: 800; color: #fff;
}
.nav-pro-badge {
  padding: 3px 8px; border-radius: 5px;
  background: rgba(255,255,255,0.10);
  border: 1px solid rgba(255,255,255,0.20);
  color: #fff; font-size: 0.68rem; font-weight: 800; letter-spacing: 0.06em;
}
.nav-dropdown {
  position: absolute; right: 0; top: calc(100% + 8px);
  min-width: 180px; background: var(--c-surface);
  border: 1px solid var(--c-border); border-radius: var(--r-md);
  padding: 6px;
  box-shadow: 0 8px 40px rgba(0,0,0,0.6); z-index: 200;
}
.nav-dropdown a,.nav-dropdown button {
  display: block; width: 100%; padding: 9px 12px; border-radius: 8px;
  font-size: 0.84rem; font-weight: 600; color: var(--c-text2);
  background: none; border: none; cursor: pointer;
  font-family: var(--font); text-align: left; transition: all 0.12s;
}
.nav-dropdown a:hover,.nav-dropdown button:hover { color: var(--c-text); background: rgba(255,255,255,0.05); }
.nav-upgrade-link { color: var(--c-accent) !important; }
.nav-dropdown-sep { height: 1px; background: var(--c-border); margin: 5px 0; }

/* ── Feature bullets ─────────────────────────────────────────── */
.feature-list { list-style: none; margin-bottom: 24px; }
.feature-list li {
  display: flex; align-items: center; gap: 10px;
  font-size: 0.88rem; color: var(--c-text2); padding: 6px 0;
}
.feature-list li::before {
  content: "";
  width: 18px; height: 18px; border-radius: 50%; flex-shrink: 0;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.15);
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 16 16' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M3.5 8l3 3 5.5-5.5' stroke='%23ffffff' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-size: 14px; background-repeat: no-repeat; background-position: center;
}

/* ── Password strength ───────────────────────────────────────── */
.pw-strength { margin-top: 8px; }
.pw-bar { height: 3px; border-radius: 2px; background: var(--c-border); overflow: hidden; }
.pw-bar-fill { height: 100%; border-radius: 2px; transition: width 0.3s, background 0.3s; width: 0; }
.pw-label { font-size: 0.75rem; color: var(--c-text3); margin-top: 4px; }

/* ── Sent state (forgot password) ───────────────────────────── */
.sent-state { text-align: center; display: none; }
.sent-state.show { display: block; }
.sent-icon { font-size: 2.8rem; margin-bottom: 18px; }

/* ── Responsive ─────────────────────────────────────────────── */
@media (max-width: 640px) {
  .auth-card { padding: 32px 22px; }
  .auth-title { font-size: 1.45rem; }
}

/* ── Auth Modal overlay ──────────────────────────────────────── */
.ib-modal-overlay {
  position: fixed; inset: 0; z-index: 9999;
  background: rgba(0,0,0,0.75);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  display: flex; align-items: center; justify-content: center;
  padding: 20px;
  animation: ib-fade-in 0.18s ease;
}
.ib-modal-overlay.closing {
  animation: ib-fade-out 0.15s ease forwards;
}
@keyframes ib-fade-in  { from { opacity:0 } to { opacity:1 } }
@keyframes ib-fade-out { from { opacity:1 } to { opacity:0 } }

.ib-modal-card {
  background: #0f0f0f;
  border: 1px solid rgba(255,255,255,0.10);
  border-radius: 20px;
  padding: 36px 32px 32px;
  width: 100%; max-width: 420px;
  box-shadow: 0 24px 80px rgba(0,0,0,0.8);
  position: relative;
  animation: ib-slide-up 0.22s cubic-bezier(0.22,1,0.36,1);
}
@keyframes ib-slide-up { from { transform:translateY(16px);opacity:0 } to { transform:translateY(0);opacity:1 } }

.ib-modal-close {
  position: absolute; top: 16px; right: 16px;
  width: 30px; height: 30px; border-radius: 8px;
  background: rgba(255,255,255,0.06); border: none; cursor: pointer;
  color: var(--c-text2); font-size: 1.1rem; display: flex;
  align-items: center; justify-content: center;
  transition: all 0.12s;
}
.ib-modal-close:hover { background: rgba(255,255,255,0.12); color: var(--c-text); }

.ib-modal-tabs {
  display: flex; gap: 4px;
  background: rgba(255,255,255,0.04);
  border-radius: 10px; padding: 4px;
  margin-bottom: 28px;
}
.ib-modal-tab {
  flex: 1; padding: 9px; border-radius: 7px;
  font-size: 0.88rem; font-weight: 700;
  background: none; border: none; cursor: pointer;
  color: var(--c-text2); font-family: var(--font);
  transition: all 0.15s;
}
.ib-modal-tab.active {
  background: #fff; color: #000;
  box-shadow: 0 2px 8px rgba(0,0,0,0.4);
}
.ib-modal-logo {
  display: flex; align-items: center; gap: 8px;
  margin-bottom: 22px;
}
.ib-modal-logo-icon {
  width: 32px; height: 32px; border-radius: 9px;
  background: #1a1a1a; border: 1px solid rgba(255,255,255,0.15);
  display: flex; align-items: center; justify-content: center;
  font-weight: 900; font-size: 0.78rem; color: #fff;
}
.ib-modal-logo-text {
  font-size: 1rem; font-weight: 800; letter-spacing: -0.04em;
}
.ib-modal-logo-text span { color: #fff; }

.ib-modal-pane { display: none; }
.ib-modal-pane.active { display: block; }

@media (max-width: 480px) {
  .ib-modal-card { padding: 28px 20px 24px; border-radius: 16px; }
}