.css

/* ===== Reset & Base ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --primary: #5b6f8c;
  --primary-light: #7d93b0;
  --primary-dark: #3e5169;
  --accent: #a8c4d9;
  --bg: #f7f9fc;
  --bg-alt: #eef2f7;
  --card: #ffffff;
  --text: #2c3e50;
  --text-light: #6b7c93;
  --border: #e3e8ef;
  --shadow: 0 4px 20px rgba(91, 111, 140, 0.08);
  --shadow-lg: 0 10px 40px rgba(91, 111, 140, 0.12);
  --radius: 16px;
  --radius-sm: 10px;
  --transition: 0.3s ease;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Cairo', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, textarea, select { font-family: inherit; }

/* ===== Navbar ===== */
.navbar {
  position: fixed; top: 0; right: 0; left: 0;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 1000;
  box-shadow: 0 1px 10px rgba(91, 111, 140, 0.06);
  transition: box-shadow var(--transition);
}
.nav-inner {
  max-width: 1200px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 24px;
}
.logo { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 1.3rem; color: var(--primary-dark); }
.logo-icon { font-size: 1.5rem; }
.nav-links { display: flex; gap: 6px; }
.nav-links a {
  padding: 8px 16px; border-radius: var(--radius-sm);
  font-size: 0.95rem; font-weight: 500; color: var(--text-light);
  transition: all var(--transition);
}
.nav-links a:hover, .nav-links a.active {
  color: var(--primary-dark); background: var(--bg-alt);
}
.nav-toggle { display: none; flex-direction: column; gap: 5px; padding: 6px; }
.nav-toggle span {
  width: 24px; height: 3px; background: var(--primary-dark);
  border-radius: 3px; transition: var(--transition);
}

/* ===== Hero ===== */
.hero {
  min-height: 100vh; display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  text-align: center; padding: 100px 24px 60px;
  background: linear-gradient(160deg, var(--bg) 0%, var(--bg-alt) 100%);
}
.hero-content { max-width: 700px; margin-bottom: 50px; }
.hero-badge {
  display: inline-block; padding: 6px 18px;
  background: var(--card); border: 1px solid var(--border);
  border-radius: 50px; font-size: 0.85rem; color: var(--primary);
  font-weight: 600; margin-bottom: 20px; box-shadow: var(--shadow);
}
.hero-title {
  font-size: clamp(2.5rem, 6vw, 4rem); font-weight: 800;
  color: var(--primary-dark); margin-bottom: 16px;
  background: linear-gradient(135deg, var(--primary-dark), var(--primary-light));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle {
  font-size: 1.15rem; color: var(--text-light); margin-bottom: 32px;
  max-width: 560px; margin-left: auto; margin-right: auto;
}
.hero-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

.hero-cards {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px;
  max-width: 1000px; width: 100%;
}
.hero-card {
  background: var(--card); border-radius: var(--radius);
  padding: 24px 18px; box-shadow: var(--shadow);
  display: flex; flex-direction: column; align-items: center; text-align: center;
  transition: all var(--transition); border: 1px solid transparent;
}
.hero-card:hover {
  transform: translateY(-6px); box-shadow: var(--shadow-lg);
  border-color: var(--accent);
}
.hc-icon { font-size: 2.2rem; margin-bottom: 12px; }
.hc-title { font-weight: 700; font-size: 1.05rem; color: var(--primary-dark); margin-bottom: 6px; }
.hc-desc { font-size: 0.85rem; color: var(--text-light); }

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 12px 28px; border-radius: var(--radius-sm);
  font-size: 0.95rem; font-weight: 600;
  transition: all var(--transition); cursor: pointer;
}
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff; box-shadow: 0 4px 14px rgba(91, 111, 140, 0.3);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(91, 111, 140, 0.4); }
.btn-ghost {
  background: var(--card); color: var(--primary-dark);
  border: 1px solid var(--border);
}
.btn-ghost:hover { background: var(--bg-alt); border-color: var(--accent); }
.btn-sm { padding: 8px 18px; font-size: 0.85rem; }

/* ===== Sections ===== */
.section {
  padding: 80px 24px; max-width: 1200px; margin: 0 auto;
}
.section-alt { background: var(--bg-alt); max-width: none; }
.section-alt > * { max-width: 1200px; margin-left: auto; margin-right: auto; }
.section-head { text-align: center; margin-bottom: 48px; }
.section-icon { font-size: 2.5rem; display: block; margin-bottom: 14px; }
.section-head h2 {
  font-size: 2rem; font-weight: 700; color: var(--primary-dark); margin-bottom: 10px;
}
.section-head p { color: var(--text-light); font-size: 1.05rem; max-width: 560px; margin: 0 auto; }

/* ===== AI Assistant ===== */
.assistant-box {
  max-width: 720px; margin: 0 auto;
  background: var(--card); border-radius: var(--radius);
  box-shadow: var(--shadow-lg); overflow: hidden;
  border: 1px solid var(--border);
}
.chat-window {
  height: 360px; overflow-y: auto; padding: 24px;
  display: flex; flex-direction: column; gap: 16px;
  background: linear-gradient(180deg, var(--bg) 0%, var(--card) 100%);
}
.chat-msg { display: flex; gap: 10px; align-items: flex-start; max-width: 85%; }
.chat-msg.user { align-self: flex-start; flex-direction: row; }
.chat-msg.bot { align-self: flex-end; flex-direction: row-reverse; }
.chat-avatar {
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--bg-alt); display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem; flex-shrink: 0;
}
.chat-bubble {
  padding: 12px 18px; border-radius: var(--radius-sm);
  font-size: 0.95rem; line-height: 1.6;
}
.chat-msg.bot .chat-bubble { background: var(--card); border: 1px solid var(--border); color: var(--text); }
.chat-msg.user .chat-bubble { background: linear-gradient(135deg, var(--primary), var(--primary-light)); color: #fff; }
.chat-suggestions { display: flex; flex-wrap: wrap; gap: 8px; padding: 14px 24px; border-top: 1px solid var(--border); }
.suggestion-chip {
  padding: 7px 16px; border-radius: 50px; font-size: 0.85rem;
  background: var(--bg-alt); color: var(--primary-dark);
  border: 1px solid var(--border); transition: all var(--transition);
}
.suggestion-chip:hover { background: var(--accent); color: #fff; border-color: var(--accent); }
.chat-input-row { display: flex; gap: 10px; padding: 16px 24px; border-top: 1px solid var(--border); }
.chat-input-row input {
  flex: 1; padding: 12px 16px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); font-size: 0.95rem; outline: none;
  transition: border-color var(--transition);
}
.chat-input-row input:focus { border-color: var(--primary-light); }

/* ===== GPA Calculator ===== */
.gpa-container { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.gpa-card {
  background: var(--card); border-radius: var(--radius);
  padding: 28px; box-shadow: var(--shadow); border: 1px solid var(--border);
}
.gpa-card h3 { font-size: 1.2rem; color: var(--primary-dark); margin-bottom: 20px; }
.gpa-table-head {
  display: grid; grid-template-columns: 2fr 1fr 1.2fr 0.5fr; gap: 10px;
  padding: 0 0 10px; font-size: 0.85rem; font-weight: 600; color: var(--text-light);
  border-bottom: 2px solid var(--border); margin-bottom: 12px;
}
.course-row {
  display: grid; grid-template-columns: 2fr 1fr 1.2fr 0.5fr; gap: 10px;
  margin-bottom: 10px; align-items: center;
}
.course-row input, .course-row select {
  padding: 10px 12px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); font-size: 0.9rem; outline: none;
  transition: border-color var(--transition);
}
.course-row input:focus, .course-row select:focus { border-color: var(--primary-light); }
.course-remove {
  width: 34px; height: 34px; border-radius: 50%;
  background: #fde8e8; color: #e57373; font-size: 1.2rem;
  display: flex; align-items: center; justify-content: center;
  transition: all var(--transition);
}
.course-remove:hover { background: #e57373; color: #fff; }

.gpa-results { display: flex; flex-direction: column; }
.result-block { display: flex; gap: 20px; }
.result-item { flex: 1; display: flex; flex-direction: column; gap: 6px; }
.result-label { font-size: 0.85rem; color: var(--text-light); font-weight: 500; }
.result-value {
  font-size: 2rem; font-weight: 800; color: var(--primary);
}
.divider { height: 1px; background: var(--border); margin: 20px 0; }
.target-block { display: flex; flex-direction: column; gap: 10px; }
.target-block input {
  padding: 10px 14px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); font-size: 0.9rem; outline: none;
}
.target-block input:focus { border-color: var(--primary-light); }
.target-result {
  margin-top: 8px; padding: 14px; border-radius: var(--radius-sm);
  background: var(--bg-alt); font-size: 0.95rem; color: var(--primary-dark);
  display: none;
}
.target-result.show { display: block; }

/* ===== Performance ===== */
.perf-container { display: grid; grid-template-columns: 1fr 1.3fr; gap: 24px; }
.perf-card {
  background: var(--card); border-radius: var(--radius);
  padding: 28px; box-shadow: var(--shadow); border: 1px solid var(--border);
}
.perf-card h3 { font-size: 1.2rem; color: var(--primary-dark); margin-bottom: 20px; }
.semester-row {
  display: grid; grid-template-columns: 1fr 1fr 0.5fr; gap: 10px;
  margin-bottom: 10px; align-items: center;
}
.semester-row input {
  padding: 10px 12px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); font-size: 0.9rem; outline: none;
}
.semester-row input:focus { border-color: var(--primary-light); }
.perf-card .btn { margin-top: 14px; }
.perf-card .btn + .btn { margin-right: 8px; }

.chart-area {
  height: 220px; background: var(--bg); border-radius: var(--radius-sm);
  padding: 16px; display: flex; align-items: flex-end; gap: 12px;
  overflow-x: auto; position: relative;
}
.chart-empty {
  width: 100%; text-align: center; color: var(--text-light);
  font-size: 0.9rem; align-self: center;
}
.chart-bar-group { display: flex; flex-direction: column; align-items: center; gap: 6px; flex: 1; min-width: 50px; }
.chart-bar {
  width: 100%; max-width: 50px; border-radius: 8px 8px 0 0;
  background: linear-gradient(180deg, var(--primary-light), var(--primary));
  transition: height 0.5s ease; position: relative;
}
.chart-bar-val {
  position: absolute; top: -22px; left: 50%; transform: translateX(-50%);
  font-size: 0.75rem; font-weight: 700; color: var(--primary-dark);
}
.chart-bar-label { font-size: 0.75rem; color: var(--text-light); text-align: center; }

.perf-stats {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px;
  margin-top: 20px;
}
.ps-item { text-align: center; padding: 12px; background: var(--bg); border-radius: var(--radius-sm); }
.ps-label { display: block; font-size: 0.78rem; color: var(--text-light); margin-bottom: 4px; }
.ps-value { font-size: 1.3rem; font-weight: 700; color: var(--primary-dark); }

.plan-block { margin-top: 20px; display: flex; flex-direction: column; gap: 10px; }
.plan-block input {
  padding: 10px 14px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); font-size: 0.9rem; outline: none;
}
.plan-block input:focus { border-color: var(--primary-light); }
.plan-result {
  margin-top: 8px; padding: 14px; border-radius: var(--radius-sm);
  background: var(--bg-alt); font-size: 0.95rem; color: var(--primary-dark);
  display: none;
}
.plan-result.show { display: block; }

/* ===== Evaluation ===== */
.eval-container { max-width: 560px; margin: 0 auto; }
.eval-form {
  background: var(--card); border-radius: var(--radius);
  padding: 32px; box-shadow: var(--shadow); border: 1px solid var(--border);
  display: flex; flex-direction: column; gap: 22px;
}
.form-group { display: flex; flex-direction: column; gap: 8px; }
.form-group label { font-size: 0.9rem; font-weight: 600; color: var(--primary-dark); }
.form-group textarea, .form-group input, .form-group select {
  padding: 12px 16px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); font-size: 0.95rem; outline: none;
  transition: border-color var(--transition); resize: vertical;
}
.form-group textarea:focus, .form-group input:focus, .form-group select:focus {
  border-color: var(--primary-light);
}
.star-rating { display: flex; gap: 6px; }
.star {
  font-size: 1.8rem; color: #d0d8e2; cursor: pointer; transition: color 0.2s;
}
.star.active, .star:hover, .star:hover ~ .star { color: #f5a623; }
.star.active { color: #f5a623; }
.eval-thanks, .contact-thanks {
  text-align: center; padding: 40px; background: var(--card);
  border-radius: var(--radius); box-shadow: var(--shadow); border: 1px solid var(--border);
}
.thanks-icon { font-size: 3rem; display: block; margin-bottom: 16px; }
.eval-thanks h3, .contact-thanks h3 { color: var(--primary-dark); margin-bottom: 8px; }
.eval-thanks p, .contact-thanks p { color: var(--text-light); }

/* ===== Contact ===== */
.contact-container { max-width: 620px; margin: 0 auto; }
.contact-form {
  background: var(--card); border-radius: var(--radius);
  padding: 32px; box-shadow: var(--shadow); border: 1px solid var(--border);
  display: flex; flex-direction: column; gap: 20px;
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

/* ===== Footer ===== */
.footer {
  background: var(--primary-dark); color: #fff; padding: 50px 24px 30px;
}
.footer-inner { max-width: 1200px; margin: 0 auto; text-align: center; }
.footer-brand {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  font-size: 1.4rem; font-weight: 700; margin-bottom: 14px;
}
.footer-text { color: rgba(255,255,255,0.7); font-size: 0.95rem; margin-bottom: 24px; max-width: 500px; margin-left: auto; margin-right: auto; }
.footer-links { display: flex; flex-wrap: wrap; gap: 16px; justify-content: center; margin-bottom: 24px; }
.footer-links a { color: rgba(255,255,255,0.8); font-size: 0.9rem; transition: color var(--transition); }
.footer-links a:hover { color: #fff; }
.footer-copy { color: rgba(255,255,255,0.5); font-size: 0.85rem; padding-top: 20px; border-top: 1px solid rgba(255,255,255,0.15); }

/* ===== Toast ===== */
.toast {
  position: fixed; bottom: 30px; left: 50%; transform: translateX(-50%) translateY(120px);
  background: var(--primary-dark); color: #fff; padding: 14px 28px;
  border-radius: 50px; font-size: 0.9rem; box-shadow: var(--shadow-lg);
  z-index: 2000; transition: transform 0.4s ease; white-space: nowrap;
}
.toast.show { transform: translateX(-50%) translateY(0); }

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .hero-cards { grid-template-columns: repeat(2, 1fr); }
  .gpa-container, .perf-container { grid-template-columns: 1fr; }
  .perf-stats { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .nav-toggle { display: flex; }
  .nav-links {
    position: fixed; top: 60px; right: 0; left: 0;
    background: var(--card); flex-direction: column; padding: 16px;
    box-shadow: var(--shadow-lg); gap: 4px;
    transform: translateY(-150%); transition: transform 0.3s ease;
  }
  .nav-links.open { transform: translateY(0); }
  .nav-links a { padding: 12px 16px; }
  .hero-cards { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .result-block { flex-direction: column; gap: 14px; }
  .gpa-table-head, .course-row { grid-template-columns: 1.5fr 0.8fr 1fr 0.4fr; gap: 6px; }
  .section { padding: 60px 16px; }
  .hero { padding: 90px 16px 40px; }
}