/*
 * FILE: styles.css
 * PURPOSE: Global styles for all pages
 * All colors, fonts, and layout rules are here.
 * To change the look of the entire site, edit this file only.
 */

/* ─── Google Fonts (2 fonts, minimum weights for speed) ─── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

/* ─── Design Tokens ─────────────────────────────────────── */
:root {
  /* Colors */
  --bg:       #08090d;   /* Page background      */
  --surface:  #0f1018;   /* Input backgrounds    */
  --card:     #161820;   /* Card backgrounds     */
  --border:   #1e2030;   /* Borders              */
  --accent:   #4f6ef7;   /* Primary blue         */
  --green:    #2dd4a0;   /* Success / A grade    */
  --gold:     #f7c84f;   /* Warning / PRO        */
  --red:      #f75f5f;   /* Error / Fail         */
  --text:     #e4e6f0;   /* Primary text         */
  --muted:    #6b6f85;   /* Secondary text       */

  /* Layout */
  --max-w:    860px;
  --radius:   12px;
  --radius-lg:18px;

  /* Typography */
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

/* ─── Reset ─────────────────────────────────────────────── */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ─── Subtle Background Gradient (CSS only, no JS) ─────── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 15% 20%, rgba(79,110,247,.06) 0%, transparent 60%),
    radial-gradient(ellipse 50% 60% at 85% 80%, rgba(45,212,160,.04) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
}

/* ─── Layout Wrappers ───────────────────────────────────── */
.page        { position: relative; z-index: 1; }
.container   { max-width: var(--max-w); margin: 0 auto; padding: 0 20px 80px; }

/* ─── Navigation ────────────────────────────────────────── */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(8,9,13,.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  gap: 8px;
}
.nav-logo {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}
.nav-logo span { color: var(--accent); }

.nav-right { display: flex; align-items: center; gap: 6px; }

.nav-link {
  color: var(--muted);
  text-decoration: none;
  font-size: .82rem;
  font-weight: 500;
  padding: 6px 10px;
  border-radius: 8px;
  transition: all .2s;
}
.nav-link:hover  { color: var(--text); background: var(--surface); }
.nav-link.active { color: var(--accent); background: rgba(79,110,247,.1); }

/* Login button in nav */
.nav-login-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 10px;
  cursor: pointer;
  font-size: .8rem;
  font-weight: 600;
  font-family: var(--font);
  transition: all .2s;
  white-space: nowrap;
}
.nav-login-btn:hover   { border-color: var(--accent); color: var(--accent); }
.nav-user-avatar       { width: 26px; height: 26px; border-radius: 50%; border: 2px solid var(--accent); }

/* ─── Page Header ───────────────────────────────────────── */
.page-header { text-align: center; padding: 44px 20px 32px; }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(79,110,247,.1);
  border: 1px solid rgba(79,110,247,.2);
  color: #8fa8ff;
  font-size: .71rem;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  padding: 5px 14px;
  border-radius: 20px;
  margin-bottom: 16px;
}
h1.page-title {
  font-size: clamp(1.8rem, 5vw, 2.8rem);
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 10px;
  letter-spacing: -.5px;
}
h1.page-title em {
  font-style: normal;
  background: linear-gradient(135deg, var(--accent), var(--green));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.page-subtitle {
  color: var(--muted);
  font-size: .92rem;
  max-width: 480px;
  margin: 0 auto;
  line-height: 1.65;
}

/* ─── Cards ─────────────────────────────────────────────── */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 22px;
  margin-bottom: 14px;
  transition: border-color .2s;
  contain: layout;     /* Speed: tells browser to isolate layout */
}
.card:hover   { border-color: rgba(79,110,247,.25); }
.card-title   {
  font-size: .75rem;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 16px;
}

/* ─── Form Inputs ───────────────────────────────────────── */
.input-group           { margin-bottom: 12px; }
.input-group label     {
  display: block;
  font-size: .74rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 6px;
}
input, select, textarea {
  width: 100%;
  padding: 11px 13px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius);
  font-family: var(--font);
  font-size: .88rem;
  outline: none;
  transition: border-color .2s, box-shadow .2s;
}
input:focus, select:focus, textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(79,110,247,.12);
}
input::placeholder     { color: var(--muted); }
select option          { background: var(--surface); }

/* Grid layouts */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

/* ─── Buttons ───────────────────────────────────────────── */
.btn-row { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 14px; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 11px 20px;
  border: none;
  border-radius: var(--radius);
  font-family: var(--font);
  font-size: .86rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform .18s, box-shadow .18s;
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent), #7b96ff);
  color: #fff;
  box-shadow: 0 3px 14px rgba(79,110,247,.28);
  will-change: transform;       /* Speed: GPU hint */
}
.btn-primary:hover  { transform: translateY(-2px); box-shadow: 0 7px 22px rgba(79,110,247,.42); }
.btn-primary:active { transform: translateY(0); }

.btn-ghost {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
}
.btn-ghost:hover  { border-color: var(--accent); color: var(--accent); background: rgba(79,110,247,.05); }

.btn-danger {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
}
.btn-danger:hover { border-color: var(--red); color: var(--red); background: rgba(247,95,95,.06); }

/* ─── Table Row (Subjects / Semesters) ──────────────────── */
.row-header {
  display: grid;
  gap: 8px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 8px;
}
.row-header span {
  font-size: .68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--muted);
}
.subject-row {
  display: grid;
  gap: 8px;
  margin-bottom: 8px;
  animation: rowIn .22s ease;
}
@keyframes rowIn { from { opacity:0; transform:translateX(-6px); } to { opacity:1; transform:none; } }

.del-btn {
  width: 40px;
  height: 42px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all .18s;
}
.del-btn:hover { background: rgba(247,95,95,.1); border-color: var(--red); color: var(--red); }

/* ─── Result Cards ──────────────────────────────────────── */
.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 10px;
  margin-top: 16px;
  animation: fadeUp .35s ease;
  contain: layout;
}
@keyframes fadeUp { from { opacity:0; transform:translateY(10px); } to { opacity:1; transform:none; } }

.result-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 16px;
  text-align: center;
  position: relative;
  overflow: hidden;
  contain: layout;
}
/* Top color accent line */
.result-card::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--rc-color, var(--accent));
  border-radius: 2px 2px 0 0;
}
.r-label { font-size: .67rem; text-transform: uppercase; letter-spacing: 1.5px; color: var(--muted); font-weight: 600; margin-bottom: 7px; }
.r-value { font-size: 1.9rem; font-weight: 700; line-height: 1; }
.r-sub   { font-size: .73rem; color: var(--muted); margin-top: 4px; }
.r-badge { display: inline-block; padding: 3px 9px; border-radius: 20px; font-size: .7rem; font-weight: 700; margin-top: 5px; }

/* ─── Reference Table ───────────────────────────────────── */
.grade-table { width: 100%; border-collapse: collapse; margin-top: 8px; }
.grade-table th, .grade-table td { padding: 9px 12px; text-align: left; border-bottom: 1px solid var(--border); font-size: .82rem; }
.grade-table th { font-size: .68rem; text-transform: uppercase; letter-spacing: 1px; color: var(--muted); font-weight: 700; }
.grade-table tr:last-child td { border-bottom: none; }
.grade-table tr:hover td { background: rgba(79,110,247,.03); }
.dot { display: inline-block; width: 7px; height: 7px; border-radius: 50%; margin-right: 6px; vertical-align: middle; }

/* ─── AdSense Slots ─────────────────────────────────────── */
/* Replace the inner content with your AdSense code after approval */
.ad-slot {
  background: var(--surface);
  border: 1px dashed var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  text-align: center;
  margin: 14px 0;
  color: var(--muted);
  font-size: .8rem;
  min-height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 4px;
}
.ad-slot-label { font-size: .62rem; text-transform: uppercase; letter-spacing: 2px; color: #2a2c3d; }

/* ─── Footer ────────────────────────────────────────────── */
footer {
  border-top: 1px solid var(--border);
  padding: 26px 20px;
  text-align: center;
  color: var(--muted);
  font-size: .78rem;
  line-height: 1.8;
}
footer a            { color: var(--muted); text-decoration: none; }
footer a:hover      { color: var(--accent); }
.footer-links       { display: flex; justify-content: center; gap: 18px; flex-wrap: wrap; margin-bottom: 10px; }

/* ─── SEO Content Block ─────────────────────────────────── */
.seo-block          { margin-top: 44px; padding-top: 32px; border-top: 1px solid var(--border); }
.seo-block h2       { font-size: 1.2rem; font-weight: 700; margin-bottom: 10px; }
.seo-block h3       { font-size: .95rem; font-weight: 700; margin: 18px 0 7px; }
.seo-block p        { color: var(--muted); line-height: 1.8; margin-bottom: 10px; font-size: .88rem; }
.seo-block a        { color: var(--accent); }

/* ─── Toast Notification ────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 22px;
  left: 50%;
  transform: translateX(-50%) translateY(70px);
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 11px 22px;
  border-radius: 50px;
  font-weight: 600;
  font-size: .83rem;
  transition: transform .32s cubic-bezier(.34,1.56,.64,1);
  z-index: 9999;
  box-shadow: 0 6px 24px rgba(0,0,0,.4);
  white-space: nowrap;
  pointer-events: none;
}
.toast.show { transform: translateX(-50%) translateY(0); }

/* ─── Utility Animations ────────────────────────────────── */
@keyframes fadeIn { from { opacity:0; transform:translateY(7px); } to { opacity:1; transform:none; } }
.fade-in { animation: fadeIn .35s ease both; }

/* ─── Hamburger: hidden on desktop ──────────────────────── */
.nav-menu-btn { display: none; }

/* ─── Responsive ────────────────────────────────────────── */
@media (max-width: 600px) {
  .grid-2          { grid-template-columns: 1fr; }
  .nav-link        { display: none; } /* Hide text links on mobile, keep login */
  h1.page-title    { font-size: 1.7rem; }
  .results-grid    { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 400px) {
  .results-grid    { grid-template-columns: 1fr; }
}

/* ─── Ad slot simple style ──────────────────────────────── */
.ad-label {
  display: block;
  font-size: .6rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: #2a2c3d;
  text-align: center;
  padding: 5px 0 2px;
}
.ad-slot-info {
  text-align: center;
  padding: 10px 0 12px;
  font-size: .84rem;
  font-weight: 600;
  color: var(--muted);
}
.ad-size {
  font-size: .74rem;
  color: #3a3c4d;
  margin-top: 2px;
}

/* ─── Logo styles ───────────────────────────────────────── */
.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  flex-shrink: 0;
}
.logo-text {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -.3px;
}
.logo-accent { color: var(--accent); }

/* ─── Scale editor rows — clean pill style ──────────────── */
.sc-letter {
  padding: 8px 10px;
  font-weight: 700;
  font-size: .9rem;
  text-align: center;
  text-transform: uppercase;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--accent);
  border-radius: var(--radius);
}
.sc-letter:focus { border-color: var(--accent); color: var(--text); }

.sc-min {
  padding: 8px 10px;
  font-size: .86rem;
  text-align: center;
}

/* Grade badge chips — shown in the Status column */
.sc-status {
  font-size: .74rem;
  color: var(--muted);
  padding: 4px 10px;
  background: var(--surface);
  border-radius: 20px;
  border: 1px solid var(--border);
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ─── Full responsive additions ─────────────────────────── */
@media (max-width: 768px) {
  /* Nav: hide text links, keep logo + auth */
  .nav-links-wrap { display: none; }

  /* Hamburger menu shown on mobile */
  .nav-menu-btn {
    display: flex !important;
    align-items: center;
    justify-content: center;
    width: 36px; height: 36px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    color: var(--text);
    font-size: 1.1rem;
  }

  /* Mobile dropdown menu */
  .nav-mobile-menu {
    position: absolute;
    top: 56px; left: 0; right: 0;
    background: var(--card);
    border-bottom: 1px solid var(--border);
    padding: 10px 20px;
    display: none;
    flex-direction: column;
    gap: 4px;
    z-index: 99;
  }
  .nav-mobile-menu.open { display: flex; }
  .nav-mobile-menu .nav-link {
    display: block;
    padding: 10px 14px;
    font-size: .9rem;
    border-radius: var(--radius);
  }

  /* Stack result cards 2 per row on mobile */
  .results-grid { grid-template-columns: 1fr 1fr; }

  /* Full width buttons */
  .btn-row { flex-direction: column; }
  .btn-row .btn { width: 100%; justify-content: center; }

  /* Scale editor: tighter columns */
  .scale-row       { grid-template-columns: 50px 64px 1fr 34px; }
  .scale-col-head  { grid-template-columns: 50px 64px 1fr 34px; }

  /* Tabs: wrap and fill */
  .tool-tabs  { gap: 4px; }
  .tool-tab   { font-size: .74rem; padding: 8px 5px; min-width: 60px; }
}

@media (max-width: 400px) {
  .results-grid { grid-template-columns: 1fr; }
  .page-header  { padding: 28px 16px 22px; }
  .container    { padding: 0 14px 60px; }
  .card         { padding: 16px; }

  /* Hide % sign in tab labels to save space */
  .tab-pct-label { display: none; }
}