:root { /* Colors - Light theme (default) */ --primary-color: #2d8a6e; --secondary-color: #4b5563; --dark-blue: #1f2933; --background-color: #fbfbf8; --surface-color: #ffffff; --off-white: #f4f7f5; --text-color: #1f2933; --text-muted: #5b6770; --pure-black: #000000; --light-gray: #eef4f1; --border-color: #dde5e1; /* Hero & Page Header */ --hero-bg: linear-gradient(135deg, #1f2933 0%, #1a3a3a 100%); --page-header-bg: #f0f7f4; --page-header-text: #1f2933; /* Typography & Layout */ --font-family: "Poppins", sans-serif; --container-width: 1140px; --border-radius: 12px; /* Shadows */ --shadow: 0 10px 30px rgba(31, 51, 41, 0.08); } /* Dark theme applied via class on */ html.dark { --primary-color: #6ed3ae; --secondary-color: #aab7b8; --dark-blue: #0f1a17; --pure-black: #ffffff; --background-color: #0b1411; --surface-color: #162521; --off-white: #0b1411; --text-color: #e0eae5; --text-muted: #9fb7ad; --light-gray: #20332c; --border-color: #2d4039; /* Hero & Page Header */ --hero-bg: linear-gradient(135deg, #162521 0%, #1a3a2e 100%); --page-header-bg: #162521; --page-header-text: #e0eae5; --shadow: 0 14px 40px rgba(0, 0, 0, 0.65); } /* ========================= GLOBAL STYLES ========================= */ * { box-sizing: border-box; margin: 0; padding: 0; } html { scroll-behavior: smooth; font-size: 100%; } body { font-family: var(--font-family); line-height: 1.6; /* Standardized for Poppins */ color: var(--text-color); background-color: var(--background-color); display: flex; flex-direction: column; min-height: 100vh; -webkit-font-smoothing: antialiased; } main { flex-grow: 1; } .container { max-width: var(--container-width); margin: 0 auto; padding: 0 15px; /* Increased slightly for better mobile gutters */ } img { max-width: 100%; height: auto; display: block; } /* ========================= HEADER & NAVIGATION ========================= */ .header { background-color: var(--surface-color); box-shadow: var(--shadow); padding: 10px 0; /* Tightened padding */ position: sticky; top: 0; z-index: 1000; } .navbar { display: flex; justify-content: space-between; align-items: center; } .logo { display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--text-color); font-size: 1.25rem; font-weight: 700; } .logo img { height: 45px; width: auto; } .nav-menu { display: flex; align-items: center; gap: 30px; } .nav-links { display: flex; list-style: none; gap: 30px; } .nav-links a { text-decoration: none; color: var(--text-color); font-weight: 500; position: relative; padding: 5px 0; transition: color 0.3s ease; } .nav-links a::after { content: ""; position: absolute; bottom: 0; left: 0; width: 0; height: 2px; background-color: var(--primary-color); transition: width 0.3s ease; } .nav-links a:hover { color: var(--primary-color); } .nav-links a:hover::after { width: 100%; } /* Dropdown */ .dropdown { position: relative; } .dropdown-menu { display: none; position: absolute; top: 100%; left: 0; background-color: var(--surface-color); list-style: none; min-width: 200px; padding: 10px 0; box-shadow: var(--shadow); border-radius: var(--border-radius); z-index: 999; border: 1px solid var(--border-color); } .dropdown-menu a { display: block; padding: 10px 20px; color: var(--text-color); text-decoration: none; transition: background 0.2s; } .dropdown-menu a:hover { background-color: var(--light-gray); color: var(--primary-color); } .dropdown:hover .dropdown-menu { display: block; } /* ========================= HAMBURGER ========================= */ .hamburger { display: none; cursor: pointer; background: none; border: none; padding: 5px; } .hamburger .bar { display: block; width: 25px; height: 3px; margin: 5px 0; background-color: var(--text-color); transition: all 0.3s ease; border-radius: 3px; } .hamburger.active .bar:nth-child(2) { opacity: 0; } .hamburger.active .bar:nth-child(1) { transform: translateY(8px) rotate(45deg); } .hamburger.active .bar:nth-child(3) { transform: translateY(-8px) rotate(-45deg); } /* ========================= THEME TRANSITION ========================= */ body, .header, .footer, .semester-card, .subject-card, .chapter-card, .year-sidebar, .main-content-area, .dropdown-menu, .nav-menu, .page-header, .exam-paper, .exam-instructions, .answer, .question-number { transition: background-color 0.35s ease, color 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease; } /* ========================= THEME TOGGLE ========================= */ .theme-toggle { display: flex; align-items: center; justify-content: center; background: none; border: 2px solid var(--border-color); border-radius: 50%; width: 40px; height: 40px; cursor: pointer; color: var(--text-color); transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease, transform 0.3s ease; flex-shrink: 0; } .theme-toggle:hover { background-color: var(--light-gray); border-color: var(--primary-color); color: var(--primary-color); transform: rotate(15deg); } .theme-icon { width: 20px; height: 20px; } /* Light mode: show moon (click to go dark), hide sun */ .sun-icon { display: none; } .moon-icon { display: block; } /* Dark mode: show sun (click to go light), hide moon */ html.dark .sun-icon { display: block; } html.dark .moon-icon { display: none; } /* ========================= BUTTONS ========================= */ .btn { padding: 12px 28px; border-radius: var(--border-radius); font-weight: 600; border: 2px solid transparent; cursor: pointer; transition: all 0.3s ease; text-decoration: none; display: inline-flex; align-items: center; justify-content: center; } .btn-primary { background-color: var(--primary-color); color: #ffffff !important; } .btn-primary:hover { filter: brightness(1.1); transform: translateY(-2px); box-shadow: 0 4px 12px rgba(63, 174, 143, 0.3); } .btn-secondary { background: transparent; color: var(--primary-color); border-color: var(--primary-color); } .btn-secondary:hover { background-color: var(--primary-color); color: #ffffff; } /* ========================= PAGE HEADER ========================= */ .page-header { background-color: var(--page-header-bg); color: var(--page-header-text); padding: 0px 15px; text-align: center; border-bottom: 4px solid var(--primary-color); transition: background-color 0.35s ease, color 0.35s ease, border-color 0.35s ease; } /* ========================= FOOTER ========================= */ .footer { background-color: var(--surface-color); color: var(--text-color); padding: 40px 0 20px; margin-top: auto; } .footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 40px; margin-bottom: 40px; } .footer-links-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0; } .footer-column { display: flex; flex-direction: column; } .footer-heading { color: var(--text-color); font-size: 1.1rem; font-weight: 700; margin-bottom: 20px; position: relative; text-transform: uppercase; letter-spacing: 1px; } .footer-heading::after { content: ""; width: 30px; height: 2px; background-color: var(--primary-color); position: absolute; bottom: -5px; left: 0; } .footer-about { color: var(--text-muted); line-height: 1.6; font-size: 0.95rem; } .footer-links { list-style: none; } .footer-links li { margin-bottom: 12px; } .footer-links a { color: var(--text-muted); text-decoration: none; transition: color 0.3s ease, padding-left 0.3s ease; } .footer-links a:hover { color: var(--primary-color); padding-left: 5px; } .social-icons { display: flex; gap: 15px; margin-top: 15px; } .social-icons a img { width: 24px; height: 24px; transition: transform 0.3s ease; } .social-icons a:hover img { transform: translateY(-3px); } .footer-bottom { border-top: 1px solid var(--border-color); text-align: center; padding-top: 20px; font-size: 0.85rem; color: var(--text-muted); } .footer-legal-links { margin-top: 6px; } .footer-legal-links a, .footer-legal-links a:visited { color: var(--text-muted); text-decoration: none; transition: color 0.3s ease, padding-left 0.3s ease; } .footer-legal-links a:hover { color: var(--primary-color); padding-left: 5px; } .footer-dot { margin: 0 6px; } /* ========================= MEDIA QUERIES ========================= */ @media (max-width: 768px) { .hamburger { display: block; } .nav-menu { position: fixed; top: 0; right: -100%; /* Fully hidden off-screen */ height: 100vh; background-color: var(--surface-color); flex-direction: column; padding: 100px 30px; transition: right 0.4s cubic-bezier(0.4, 0, 0.2, 1), background-color 0.35s ease; box-shadow: -10px 0 30px rgba(0, 0, 0, 0.1); } .nav-menu.active { right: 0; } .nav-links { flex-direction: column; width: 100%; gap: 20px; } .nav-links a { font-size: 1.1rem; width: 100%; } .dropdown-menu { position: static; box-shadow: none; border: none; padding-left: 20px; display: block; /* Show links in mobile drawer */ background: transparent; } .page-header h1 { padding-top: 10px; font-size: 1.5rem; } .page-header p { font-size: 1rem; } } @media (max-width: 480px) { .footer-grid { grid-template-columns: 1fr; } .footer-column:nth-child(4) { display: none; } } .subject-nav-section { background-color: var(--off-white); padding: 20px 0; border-bottom: 1px solid var(--border-color); transition: background-color 0.35s ease, border-color 0.35s ease; } .subject-nav { display: flex; justify-content: center; gap: 15px; flex-wrap: wrap; } .subject-nav .btn-primary { box-shadow: 0 4px 15px rgba(0, 123, 255, 0.3); transition: transform 0.3s ease; } @media (max-width: 767px) { .subject-nav { flex-wrap: nowrap; overflow-x: auto; gap: 10px; } .subject-nav .btn { padding: 8px 14px; font-size: 0.85rem; white-space: nowrap; flex-shrink: 0; } }