/* ========================================================= Java Interview Site — Centralized Theme Light theme is the default. Toggle by setting `data-theme="dark"` on . ========================================================= */ :root { /* Brand accents — same in both themes */ --accent: #00b8d4; --accent2: #ff6b35; --accent3: #a855f7; --green: #16a34a; --yellow: #ca8a04; /* LIGHT THEME (default) */ --bg: #f8fafc; --surface: #ffffff; --surface2: #f1f5f9; --border: #e2e8f0; --text: #0f172a; --text-strong: #0f172a; --muted: #64748b; --code-bg: #f1f5f9; --code-text: #0f172a; --code-inline-color: #0369a1; --card-hover-border: #cbd5e1; --card-open-border: #94a3b8; --row-tint: rgba(15, 23, 42, 0.03); --sidebar-hover-bg: rgba(15, 23, 42, 0.04); --sidebar-active-bg: rgba(0, 184, 212, 0.10); --hero-grad-from: #ffffff; --hero-grad-to: #eef2f7; --hero-glow: rgba(0, 184, 212, 0.10); --tip-bg: rgba(22, 163, 74, 0.08); --tip-border: rgba(22, 163, 74, 0.25); --warn-bg: rgba(202, 138, 4, 0.10); --warn-border: rgba(202, 138, 4, 0.25); --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04); --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.06); --nav-active-fg: #ffffff; } /* DARK THEME — original look */ :root[data-theme="dark"] { --accent: #00d4ff; --green: #22c55e; --yellow: #fbbf24; --bg: #0a0e1a; --surface: #111827; --surface2: #1a2235; --border: #1e2d45; --text: #e2e8f0; --text-strong: #ffffff; --muted: #64748b; --code-bg: #0d1117; --code-text: #e2e8f0; --code-inline-color: #7dd3fc; --card-hover-border: #2a3f60; --card-open-border: #2a4a70; --row-tint: rgba(255, 255, 255, 0.02); --sidebar-hover-bg: rgba(255, 255, 255, 0.03); --sidebar-active-bg: rgba(0, 212, 255, 0.05); --hero-grad-from: #0a0e1a; --hero-grad-to: #0f1729; --hero-glow: rgba(0, 212, 255, 0.08); --tip-bg: rgba(34, 197, 94, 0.08); --tip-border: rgba(34, 197, 94, 0.20); --warn-bg: rgba(251, 191, 36, 0.08); --warn-border: rgba(251, 191, 36, 0.20); --shadow-sm: none; --shadow-md: none; --nav-active-fg: #000000; } * { margin: 0; padding: 0; box-sizing: border-box; } body { background: var(--bg); color: var(--text); font-family: 'Syne', sans-serif; min-height: 100vh; overflow-x: hidden; transition: background-color 0.2s ease, color 0.2s ease; } a { color: inherit; text-decoration: none; } /* TOPNAV */ .topnav { background: var(--surface); border-bottom: 1px solid var(--border); padding: 0 40px; display: flex; align-items: center; gap: 0; height: 52px; position: sticky; top: 0; z-index: 200; backdrop-filter: blur(10px); overflow-x: auto; box-shadow: var(--shadow-sm); } .topnav::-webkit-scrollbar { display: none; } .nav-logo { font-family: 'JetBrains Mono', monospace; font-weight: 700; font-size: 14px; color: var(--accent); margin-right: 32px; white-space: nowrap; flex-shrink: 0; } .nav-links { display: flex; gap: 4px; flex: 1; } .nav-link { padding: 6px 12px; border-radius: 6px; font-size: 12px; font-weight: 600; color: var(--muted); white-space: nowrap; transition: all 0.2s; cursor: pointer; } .nav-link:hover { color: var(--text); background: var(--surface2); } .nav-link.active { background: var(--accent); color: var(--nav-active-fg); } /* THEME TOGGLE */ .theme-toggle { margin-left: 12px; background: var(--surface2); border: 1px solid var(--border); border-radius: 6px; width: 32px; height: 32px; display: inline-flex; align-items: center; justify-content: center; color: var(--muted); cursor: pointer; transition: all 0.2s; flex-shrink: 0; } .theme-toggle:hover { color: var(--accent); border-color: var(--accent); } .theme-toggle .icon-sun { display: none; } .theme-toggle .icon-moon { display: block; } :root[data-theme="dark"] .theme-toggle .icon-sun { display: block; } :root[data-theme="dark"] .theme-toggle .icon-moon { display: none; } /* HEADER */ header { padding: 48px 40px 32px; border-bottom: 1px solid var(--border); background: linear-gradient(135deg, var(--hero-grad-from) 0%, var(--hero-grad-to) 100%); position: relative; overflow: hidden; } header::before { content: ''; position: absolute; top: -80px; right: -80px; width: 400px; height: 400px; background: radial-gradient(circle, var(--hero-glow) 0%, transparent 70%); pointer-events: none; } .header-tag { font-family: 'JetBrains Mono', monospace; font-size: 11px; color: var(--accent); letter-spacing: 3px; text-transform: uppercase; margin-bottom: 12px; opacity: 0.85; } h1 { font-size: clamp(24px, 4vw, 48px); font-weight: 800; line-height: 1.1; background: linear-gradient(135deg, var(--text-strong) 0%, var(--accent) 50%, var(--accent3) 100%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; margin-bottom: 12px; } .subtitle { color: var(--muted); font-size: 15px; max-width: 500px; } .stats-row { display: flex; gap: 20px; margin-top: 24px; flex-wrap: wrap; } .stat { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 8px 16px; display: flex; align-items: center; gap: 8px; font-size: 13px; box-shadow: var(--shadow-sm); } .stat-num { font-family: 'JetBrains Mono', monospace; font-weight: 700; color: var(--accent); } /* CONTROLS */ .controls { padding: 16px 40px; background: var(--surface); border-bottom: 1px solid var(--border); display: flex; gap: 10px; flex-wrap: wrap; align-items: center; position: sticky; top: 52px; z-index: 100; backdrop-filter: blur(10px); } .search-wrap { position: relative; flex: 1; min-width: 180px; max-width: 360px; } .search-wrap svg { position: absolute; left: 10px; top: 50%; transform: translateY(-50%); color: var(--muted); pointer-events: none; } input[type="text"] { width: 100%; background: var(--bg); border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px 8px 34px; color: var(--text); font-family: 'JetBrains Mono', monospace; font-size: 13px; outline: none; transition: border-color 0.2s; } input[type="text"]:focus { border-color: var(--accent); } input[type="text"]::placeholder { color: var(--muted); } .filter-btn { background: var(--bg); border: 1px solid var(--border); border-radius: 8px; padding: 7px 13px; color: var(--muted); font-family: 'Syne', sans-serif; font-size: 12px; font-weight: 600; cursor: pointer; transition: all 0.2s; } a.filter-btn { text-decoration: none; display: inline-flex; align-items: center; justify-content: center; } .filter-btn:hover { border-color: var(--accent); color: var(--accent); } .filter-btn.active { background: var(--accent); border-color: var(--accent); color: var(--nav-active-fg); } .expand-all { margin-left: auto; background: transparent; border: 1px solid var(--border); border-radius: 8px; padding: 7px 13px; color: var(--muted); font-family: 'Syne', sans-serif; font-size: 12px; font-weight: 600; cursor: pointer; transition: all 0.2s; } .expand-all:hover { border-color: var(--accent3); color: var(--accent3); } /* LAYOUT */ .main { display: flex; } .sidebar { width: 240px; min-width: 240px; border-right: 1px solid var(--border); padding: 20px 0; position: sticky; top: calc(52px + 56px); height: calc(100vh - 108px); overflow-y: auto; background: var(--surface); } .sidebar::-webkit-scrollbar { width: 3px; } .sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; } .cat-header { padding: 6px 16px; font-size: 9px; font-weight: 700; letter-spacing: 2px; text-transform: uppercase; color: var(--muted); } .sidebar-link { display: flex; align-items: center; gap: 8px; padding: 6px 16px 6px 24px; font-size: 12px; color: var(--muted); cursor: pointer; transition: all 0.15s; border-left: 2px solid transparent; font-weight: 500; } .sidebar-link:hover { color: var(--text); background: var(--sidebar-hover-bg); } .sidebar-link.active { color: var(--accent); border-left-color: var(--accent); background: var(--sidebar-active-bg); } /* CONTENT */ .content { flex: 1; padding: 24px 32px; min-width: 0; } .section-title { font-size: 11px; font-weight: 700; letter-spacing: 3px; text-transform: uppercase; color: var(--muted); padding: 24px 0 12px; border-bottom: 1px solid var(--border); margin-bottom: 12px; } /* CARDS */ .card { background: var(--surface); border: 1px solid var(--border); border-radius: 10px; margin-bottom: 8px; overflow: hidden; transition: border-color 0.2s, box-shadow 0.2s; box-shadow: var(--shadow-sm); } .card:hover { border-color: var(--card-hover-border); } .card.open { border-color: var(--card-open-border); box-shadow: var(--shadow-md); } .card.highlighted { border-color: var(--accent); } .card-header { display: flex; align-items: center; gap: 12px; padding: 14px 16px; cursor: pointer; user-select: none; transition: background 0.2s; } .card-header:hover { background: var(--surface2); } .q-num { font-family: 'JetBrains Mono', monospace; font-size: 11px; color: var(--muted); min-width: 28px; font-weight: 600; } .q-title { flex: 1; font-size: 14px; font-weight: 600; } .difficulty { font-family: 'JetBrains Mono', monospace; font-size: 9px; font-weight: 700; letter-spacing: 1px; padding: 3px 7px; border-radius: 4px; } .diff-basic { background: rgba(34,197,94,0.15); color: var(--green); } .diff-mid { background: rgba(251,191,36,0.18); color: var(--yellow); } .diff-adv { background: rgba(255,107,53,0.15); color: var(--accent2); } .diff-exp { background: rgba(168,85,247,0.15); color: var(--accent3); } .chevron { color: var(--muted); transition: transform 0.3s; flex-shrink: 0; } .card.open .chevron { transform: rotate(180deg); } .card-body { max-height: 0; overflow: hidden; transition: max-height 0.35s ease; } .card.open .card-body { max-height: 9999px; } .card-inner { border-top: 1px solid var(--border); padding: 20px; } .answer p { margin-bottom: 12px; line-height: 1.7; font-size: 14px; } .answer strong { color: var(--text-strong); } .answer em { color: var(--accent); font-style: normal; font-weight: 600; } .answer code { font-family: 'JetBrains Mono', monospace; background: var(--code-bg); padding: 2px 6px; border-radius: 4px; font-size: 12px; color: var(--code-inline-color); } .answer pre { font-family: 'JetBrains Mono', monospace; background: var(--code-bg); border: 1px solid var(--border); border-radius: 8px; padding: 16px; font-size: 12px; line-height: 1.6; overflow-x: auto; margin: 12px 0; color: var(--code-text); white-space: pre; } .answer table { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: 13px; } .answer th, .answer td { padding: 8px 12px; border: 1px solid var(--border); text-align: left; } .answer th { background: var(--surface2); color: var(--accent); font-weight: 700; font-size: 11px; letter-spacing: 0.5px; } .answer tr:nth-child(even) td { background: var(--row-tint); } .answer ul, .answer ol { padding-left: 20px; margin: 8px 0 12px; } .answer li { margin-bottom: 6px; line-height: 1.6; font-size: 14px; } .answer h4 { color: var(--accent2); font-size: 13px; margin: 12px 0 6px; } .tip-box { background: var(--tip-bg); border: 1px solid var(--tip-border); border-radius: 8px; padding: 12px 16px; font-size: 13px; margin: 12px 0; line-height: 1.6; } .warn-box { background: var(--warn-bg); border: 1px solid var(--warn-border); border-radius: 8px; padding: 12px 16px; font-size: 13px; margin: 12px 0; line-height: 1.6; } .tag-list { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; } .tag { background: var(--surface2); border: 1px solid var(--border); border-radius: 4px; padding: 3px 9px; font-family: 'JetBrains Mono', monospace; font-size: 10px; color: var(--muted); } /* INDEX PAGE */ .index-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; padding: 40px; max-width: 1200px; margin: 0 auto; } .part-card { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 28px; cursor: pointer; transition: all 0.25s; display: block; position: relative; overflow: hidden; box-shadow: var(--shadow-sm); } .part-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: var(--card-color); } .part-card:hover { border-color: var(--card-hover-border); transform: translateY(-2px); box-shadow: var(--shadow-md); } .part-icon { font-size: 32px; margin-bottom: 14px; } .part-num { font-family: 'JetBrains Mono', monospace; font-size: 10px; color: var(--muted); letter-spacing: 2px; text-transform: uppercase; margin-bottom: 6px; } .part-title { font-size: 18px; font-weight: 700; margin-bottom: 8px; color: var(--text); } .part-desc { font-size: 13px; color: var(--muted); line-height: 1.6; margin-bottom: 16px; } .part-count { font-family: 'JetBrains Mono', monospace; font-size: 13px; font-weight: 700; color: var(--card-color); } .index-hero { padding: 60px 40px 40px; border-bottom: 1px solid var(--border); background: linear-gradient(135deg, var(--hero-grad-from) 0%, var(--hero-grad-to) 100%); position: relative; overflow: hidden; text-align: center; } .index-hero::before { content: ''; position: absolute; top: -100px; left: 50%; transform: translateX(-50%); width: 600px; height: 400px; background: radial-gradient(circle, var(--hero-glow) 0%, transparent 70%); pointer-events: none; } .hero-badge { display: inline-block; font-family: 'JetBrains Mono', monospace; font-size: 11px; color: var(--accent); letter-spacing: 3px; text-transform: uppercase; margin-bottom: 16px; opacity: 0.85; } .hero-title { font-size: clamp(32px, 6vw, 64px); font-weight: 800; line-height: 1.05; background: linear-gradient(135deg, var(--text-strong) 0%, var(--accent) 50%, var(--accent3) 100%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; margin-bottom: 16px; } .hero-sub { color: var(--muted); font-size: 16px; max-width: 560px; margin: 0 auto 28px; } .hero-stats { display: flex; gap: 20px; justify-content: center; flex-wrap: wrap; } .hero-stat { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 10px 20px; text-align: center; box-shadow: var(--shadow-sm); } .hero-stat-num { font-family: 'JetBrains Mono', monospace; font-size: 24px; font-weight: 700; color: var(--accent); } .hero-stat-label { font-size: 11px; color: var(--muted); margin-top: 2px; } /* BREADCRUMB */ .breadcrumb { padding: 12px 40px; font-size: 12px; color: var(--muted); border-bottom: 1px solid var(--border); background: var(--bg); display: flex; align-items: center; gap: 8px; } .breadcrumb a { color: var(--accent); } .breadcrumb a:hover { text-decoration: underline; } /* METHODS PAGE — quick-reference tables (collapsible) */ .method-section { margin-bottom: 10px; scroll-margin-top: 120px; } .method-section .m-section-head { padding: 14px 16px; } .method-section .m-section-head h2 { flex: 1; margin: 0; padding: 0; border: none; font-size: 16px; font-weight: 700; color: var(--text-strong); display: flex; align-items: baseline; gap: 10px; } .method-section .m-section-head h2 .sec-num { font-family: 'JetBrains Mono', monospace; font-size: 11px; color: var(--muted); letter-spacing: 2px; font-weight: 600; } .method-section.card.open .card-body { max-height: 8000px; } .method-section .sec-desc { color: var(--muted); font-size: 13px; margin-bottom: 14px; line-height: 1.6; } /* Reusable collapsible section card — for Spring Boot guide */ .section-card { margin-bottom: 12px; scroll-margin-top: 120px; } .section-card > .card-header { padding: 14px 18px; cursor: pointer; display: flex; align-items: center; gap: 12px; user-select: none; background: linear-gradient(135deg, var(--surface) 0%, var(--surface2) 100%); } .section-card > .card-header h2 { flex: 1; margin: 0; padding: 0; border: none; font-size: 16px; font-weight: 700; color: var(--text-strong); display: flex; align-items: baseline; gap: 10px; } .section-card > .card-header h2 .sec-num { font-family: 'JetBrains Mono', monospace; font-size: 11px; color: var(--accent); letter-spacing: 2px; font-weight: 700; } .section-card .q-count { font-family: 'JetBrains Mono', monospace; font-size: 11px; color: var(--muted); font-weight: 600; letter-spacing: 1px; background: var(--surface2); padding: 3px 8px; border-radius: 4px; border: 1px solid var(--border); } .section-card.card.open > .card-body { max-height: 200000px; } .section-card > .card-body > .card-inner { padding: 16px 18px; border-top: 1px solid var(--border); } .section-card .section-desc { color: var(--muted); font-size: 13px; line-height: 1.6; padding: 10px 14px; background: var(--surface2); border-left: 3px solid var(--accent); border-radius: 4px; margin-bottom: 14px; } .section-card .section-desc strong { color: var(--text-strong); } /* Mastery — prominent question number */ .mastery-page .q-num { font-family: 'JetBrains Mono', monospace; font-size: 12px; font-weight: 700; color: var(--accent); background: var(--surface2); border: 1px solid var(--border); border-radius: 5px; padding: 3px 8px; min-width: 42px; text-align: center; letter-spacing: 0.5px; } :root[data-theme="dark"] .mastery-page .q-num { background: rgba(0, 212, 255, 0.08); border-color: rgba(0, 212, 255, 0.20); } /* Mastery + extended difficulty badges */ .diff-theory { background: rgba(0, 184, 212, 0.15); color: var(--accent); } .diff-tricky { background: rgba(255, 107, 53, 0.15); color: var(--accent2); } .diff-easy { background: rgba(34, 197, 94, 0.15); color: var(--green); } .diff-medium { background: rgba(251, 191, 36, 0.18); color: var(--yellow); } .diff-hard { background: rgba(239, 68, 68, 0.15); color: #ef4444; } .diff-mixed { background: rgba(236, 72, 153, 0.15); color: #ec4899; } .diff-stack { display: inline-flex; gap: 4px; } .method-table { width: 100%; border-collapse: separate; border-spacing: 0; background: var(--surface); border: 1px solid var(--border); border-radius: 8px; overflow: hidden; box-shadow: var(--shadow-sm); font-size: 13px; } .method-table th { background: var(--surface2); color: var(--accent); font-size: 10px; font-weight: 700; letter-spacing: 0.5px; text-transform: uppercase; padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--border); } .method-table td { padding: 10px 12px; border-top: 1px solid var(--border); vertical-align: top; line-height: 1.55; } .method-table tbody tr:first-child td { border-top: none; } .method-table tbody tr:nth-child(even) td { background: var(--row-tint); } .method-table tbody tr:hover td { background: var(--surface2); } .method-table .m-name { font-family: 'JetBrains Mono', monospace; font-weight: 700; color: var(--text-strong); white-space: nowrap; font-size: 12.5px; } .method-table .m-syntax { font-family: 'JetBrains Mono', monospace; font-size: 12px; color: var(--code-inline-color); background: var(--code-bg); padding: 2px 6px; border-radius: 4px; display: inline-block; } .method-table .m-note { color: var(--muted); font-size: 12.5px; } .badge-new { display: inline-block; font-family: 'JetBrains Mono', monospace; font-size: 9px; font-weight: 700; letter-spacing: 0.5px; padding: 2px 5px; border-radius: 3px; background: rgba(168, 85, 247, 0.15); color: var(--accent3); margin-left: 6px; vertical-align: middle; } .badge-star { display: inline-block; font-size: 11px; color: var(--accent2); margin-right: 4px; } .no-results { padding: 32px; text-align: center; color: var(--muted); font-size: 13px; display: none; } .no-results.visible { display: block; } @media (max-width: 768px) { .sidebar { display: none; } .topnav { padding: 0 16px; } header, .controls { padding-left: 16px; padding-right: 16px; } .content { padding: 16px; } .index-grid { padding: 20px; grid-template-columns: 1fr; } .index-hero { padding: 40px 20px; } .breadcrumb { padding: 10px 16px; } .method-table { font-size: 12px; } .method-table th, .method-table td { padding: 8px; } .method-table .m-syntax { font-size: 11px; } }