/* StudyBuddy - Light theme */
/* Color system */
:root {
  --sb-bg: #f7fafc;
  --sb-surface: #ffffff;
  --sb-card: #ffffff;
  --sb-text: #0b1220;
  --sb-muted: #4c5a70;
  --sb-primary: #2596be;
  --sb-primary-600: #1f80a3;
  --sb-accent: #6bd6f0;
  --sb-warning: #f2b705;
  --sb-danger: #e63946;
  --sb-ring: rgba(37,150,190,.35);
  --sb-border: #e6edf3;
  --sb-shadow: 0 10px 30px rgba(17,24,39,.08);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol";
  color: var(--sb-text);
  background:
    radial-gradient(1200px 600px at 70% -10%, rgba(37,150,190,.06), transparent 60%),
    radial-gradient(800px 400px at 20% -10%, rgba(107,214,240,.08), transparent 50%),
    var(--sb-bg);
  line-height: 1.6;
}

.container {
  width: min(1100px, 92vw);
  margin-inline: auto;
}

.header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(8px);
  background: var(--sb-surface); /* fallback ipv color-mix */
  border-bottom: 1px solid var(--sb-border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .9rem 0;
}
.logo {
  display: flex;
  align-items: center;
  gap: .7rem;
  text-decoration: none;
  color: var(--sb-text);
}
.logo svg { width: 28px; height: 28px; }
.logo .word { font-weight: 800; letter-spacing: .2px; }
nav a {
  color: var(--sb-muted);
  text-decoration: none;
  padding: .5rem .8rem;
  border-radius: 10px;
  transition: color .2s ease, background .2s ease;
}
nav a:hover { color: var(--sb-text); background: rgba(0,0,0,.04); }
.cta-btn {
  background: linear-gradient(135deg, var(--sb-primary), var(--sb-accent));
  color: #ffffff;
  border: none;
  padding: .6rem 1rem;
  border-radius: 12px;
  font-weight: 700;
  text-decoration: none;
  box-shadow: 0 6px 16px rgba(37,150,190,.25);
}
.cta-btn:hover { filter: brightness(1.06); }
.visually-hidden { display: none; }

/* Mobile nav */
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--sb-border);
  color: var(--sb-text);
  padding: .4rem .6rem;
  border-radius: 10px;
}
@media (max-width: 880px) {
  .nav-toggle { display: block; }
  nav {
    display: none;
    position: absolute;
    top: 60px;
    right: 4vw;
    background: var(--sb-surface);
    border: 1px solid var(--sb-border);
    border-radius: 14px;
    padding: .6rem;
    box-shadow: var(--sb-shadow);
  }
  nav.open { display: flex; flex-direction: column; min-width: 240px; }
  nav a { padding: .7rem .8rem; }
}

.hero {
  padding: clamp(3rem, 5vw + 2rem, 6rem) 0 3rem;
}
.hero-grid {
  display: grid;
  grid-template-columns: 60% 40%;
  gap: 2rem;
  align-items: center;
}
.hero h1 {
  font-size: clamp(2rem, 1.6rem + 2vw, 3rem);
  line-height: 1.15;
  margin: .2rem 0 1rem;
  letter-spacing: .2px;
}
.hero p { color: var(--sb-muted); font-size: clamp(1rem, .9rem + .3vw, 1.15rem); }
.hero .actions { display: flex; gap: .8rem; margin-top: 1.2rem; flex-wrap: wrap; }

.placeholder img { padding-left: 30px; }

.kicker {
  display: inline-block;
  font-weight: 700;
  letter-spacing: .28em;
  text-transform: uppercase;
  font-size: .8rem;
  color: var(--sb-primary);
}

.section { padding: 3rem 0; }
.section h2 {
  font-size: clamp(1.6rem, 1.3rem + 1.3vw, 2.2rem);
  margin: 0 0 .6rem;
}
.section p.lead { color: var(--sb-muted); margin-top: 0; }

.grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(3, 33%);
}
#grid-2 {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(2, 50%);
}
@media (max-width: 880px) {
  .hero-grid { grid-template-columns: 100%; }
  .grid { grid-template-columns: 100%; }
  .logo-img { width: 32px; }
  #grid-2 { grid-template-columns: 100%; }
}

.card {
  background: var(--sb-card);
  border: 1px solid var(--sb-border);
  border-radius: 16px;
  padding: 1rem;
  box-shadow: var(--sb-shadow);
}
.card h3 { margin: .2rem 0 .4rem; }
.badge {
  display: inline-block;
  font-size: .78rem;
  color: #0a0a0a;
  background: #ffe8a3;
  padding: .18rem .5rem;
  border-radius: 999px;
  font-weight: 700;
}

.steps { counter-reset: step; }
.step { display: flex; gap: 1rem; align-items: flex-start; }
.step .num {
  counter-increment: step;
  background: var(--sb-primary-600);
  color: #ffffff;
  font-weight: 800;
  border-radius: 12px;
  padding: .4rem .6rem;
  min-width: 2rem;
  text-align: center;
}

.stats {
  display: grid;
  grid-template-columns: repeat(4,25%);
  gap: 1rem;
}
.stat {
  background: var(--sb-card);
  border: 1px solid var(--sb-border);
  border-radius: 16px;
  padding: 1rem;
  text-align: center;
}
.stat .val {
  font-size: clamp(1.4rem,1rem + 1.6vw,2.2rem);
  font-weight: 900;
}
@media (max-width: 880px) {
  .stats { grid-template-columns: repeat(2,50%); }
}

.faq .item {
  border-bottom: 1px solid var(--sb-border);
  padding: .9rem 0;
}
.faq button {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  color: var(--sb-text);
  font-weight: 700;
  padding: .4rem 0;
  cursor: pointer;
}
.faq button:focus { outline: 2px solid var(--sb-ring); outline-offset: 3px; }
.faq .ans { display: none; color: var(--sb-muted); padding: .2rem 0 .6rem; }
.faq .item.open .ans { display: block; }

.footer {
  background: linear-gradient(180deg, rgba(37,150,190,.06), transparent 30%), var(--sb-surface);
  border-top: 1px solid var(--sb-border);
  margin-top: 2rem;
  padding: 2rem 0;
}
.footer .cols {
  display: grid;
  grid-template-columns: 50% 25% 25%;
  gap: 1rem;
}
.footer a { color: var(--sb-muted); text-decoration: none; }
.footer a:hover { color: var(--sb-text); }
.footer .small {
  color: var(--sb-muted);
  font-size: .9rem;
  margin-top: 1rem;
}
@media (max-width: 880px) {
  .footer .cols { grid-template-columns: 100%; }
}

.table {
  width: 100%;
  border-collapse: collapse;
  overflow: hidden;
  border-radius: 14px;
  border: 1px solid var(--sb-border);
}
.table th, .table td {
  padding: .8rem;
  border-bottom: 1px solid var(--sb-border);
}
.table th { text-align: left; color: var(--sb-muted); font-weight: 600; }
.table .price { font-weight: 900; font-size: 1.2rem; }

/* Forms */
input, select, textarea {
  width: 100%;
  background: #ffffff;
  border: 1px solid var(--sb-border);
  color: var(--sb-text);
  padding: .7rem .8rem;
  border-radius: 12px;
}
label {
  display: block;
  font-weight: 600;
  margin: .6rem 0 .25rem;
}
form .row {
  display: grid;
  grid-template-columns: 50% 50%;
  gap: .8rem;
}
@media (max-width: 880px) {
  form .row { grid-template-columns: 100%; }
}
button.primary {
  background: linear-gradient(135deg, var(--sb-primary), var(--sb-accent));
  color: #ffffff;
  border: none;
  padding: .8rem 1rem;
  border-radius: 12px;
  font-weight: 800;
  cursor: pointer;
}
.alert {
  background: #f7fbff;
  border: 1px solid var(--sb-border);
  border-radius: 12px;
  padding: .8rem;
  color: var(--sb-muted);
}
/* Succes-modal */
.sb-modal {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

.sb-modal.open {
  display: flex;
}

.sb-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
}

.sb-modal-dialog {
  position: relative;
  background: var(--sb-card);
  border-radius: 16px;
  box-shadow: var(--sb-shadow);
  padding: 1.5rem;
  max-width: 480px;
  width: min(480px, 92vw);
  margin-inline: 1rem;
}

.sb-modal-dialog h2 {
  margin-top: 0;
}

.sb-modal-close {
  margin-top: 1rem;
  background: linear-gradient(135deg, var(--sb-primary), var(--sb-accent));
  color: #ffffff;
  border: none;
  padding: .7rem 1rem;
  border-radius: 12px;
  font-weight: 700;
  cursor: pointer;
}