:root {
            --primary: #4361ee;
            --primary-dark: #3a56d4;
            --secondary: #7209b7;
            --dark: #212529;
            --light: #f8f9fa;
            --gray: #6c757d;
            --success: #4cc9f0;
            --warning: #f8961e;
            --danger: #ef233c;
            --border-radius: 12px;
            --shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
            --transition: all 0.3s ease;
            --card-bg: #ffffff;
            --body-bg: linear-gradient(135deg, #f5f7fa 0%, #e4e7f1 100%);
            --text-color: #212529;
        }

        /* Dark Mode */
        .dark-mode {
            --primary: #4cc9f0;
            --primary-dark: #3aa8d4;
            --secondary: #9d4edd;
            --dark: #f8f9fa;
            --light: #212529;
            --gray: #adb5bd;
            --card-bg: #2b2d42;
            --body-bg: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
            --text-color: #f8f9fa;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        .main-container {
            background: var(--body-bg);
            color: var(--text-color);
            line-height: 1.6;
            min-height: 100vh;
            padding: 20px;
            transition: var(--transition);
        }

        .container {
            width: 95%;
            margin: 0 auto;
        }

        .header-title {
            text-align: center;
            padding: 40px 20px;
            position: relative;
        }

        h1 {
            font-size: 2.8rem;
            margin-bottom: 15px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            font-weight: 800;
        }

        .subtitle {
            font-size: 1.2rem;
            color: var(--gray);
            max-width: 700px;
            margin: 0 auto 30px;
        }

        .theme-toggle {
            position: absolute;
            top: 20px;
            right: 20px;
            background: var(--primary);
            color: white;
            border: none;
            padding: 10px 15px;
            border-radius: 30px;
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 8px;
            font-weight: 600;
            transition: var(--transition);
        }

        .theme-toggle:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
        }

        .calculator-container {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
            margin-bottom: 40px;
        }

        @media (max-width: 900px) {
            .calculator-container {
                grid-template-columns: 1fr;
            }
        }

        .calculator-card {
            background: var(--card-bg);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            padding: 30px;
            transition: var(--transition);
        }

        .calculator-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
        }

        .calculator-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 25px;
        }

        .calculator-title {
            font-size: 1.5rem;
            color: var(--primary);
            font-weight: 700;
        }

        .calculator-description {
            color: var(--gray);
            margin-bottom: 20px;
        }

        .tabs {
            display: flex;
            gap: 10px;
            margin-bottom: 20px;
            flex-wrap: wrap;
        }

        .tab {
            padding: 10px 20px;
            background: var(--light);
            border-radius: 30px;
            cursor: pointer;
            font-weight: 600;
            transition: var(--transition);
            border: none;
            color: var(--text-color);
        }

        .tab.active {
            background: var(--primary);
            color: white;
        }

        .tab:hover:not(.active) {
            background: rgba(67, 97, 238, 0.1);
        }

        .input-group {
            margin-bottom: 20px;
        }

        label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: var(--text-color);
        }

        input, select {
            width: 100%;
            padding: 14px 15px;
            border: 1px solid rgba(0, 0, 0, 0.1);
            border-radius: var(--border-radius);
            font-size: 1rem;
            transition: var(--transition);
            background: var(--light);
            color: var(--text-color);
        }

        input:focus, select:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
        }

        .result-container {
            background: rgba(67, 97, 238, 0.1);
            padding: 25px;
            border-radius: var(--border-radius);
            margin-top: 30px;
            border-left: 4px solid var(--primary);
        }

        .result-title {
            font-size: 1.1rem;
            margin-bottom: 10px;
            color: var(--primary);
            font-weight: 600;
        }

        .result-value {
            font-size: 2rem;
            font-weight: 700;
            color: var(--text-color);
        }

        .history-container {
            margin-top: 30px;
        }

        .history-title {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 15px;
            color: var(--gray);
        }

        .history-items {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .history-item {
            background: var(--light);
            padding: 12px 15px;
            border-radius: var(--border-radius);
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: var(--transition);
            cursor: pointer;
        }

        .history-item:hover {
            transform: translateX(5px);
        }

        .history-item .calculation {
            font-weight: 600;
        }

        .history-item .result {
            color: var(--primary);
            font-weight: 700;
        }

        .clear-history {
            background: none;
            border: none;
            color: var(--danger);
            cursor: pointer;
            font-weight: 600;
            margin-top: 10px;
            display: inline-flex;
            align-items: center;
            gap: 5px;
        }

        .clear-history:hover {
            text-decoration: underline;
        }

        .info-section {
            background: var(--card-bg);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            padding: 30px;
            margin-bottom: 40px;
        }

        .info-section h2 {
            margin-bottom: 20px;
            color: var(--primary);
        }

        .info-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 25px;
        }

        .info-card {
            background: var(--light);
            padding: 20px;
            border-radius: var(--border-radius);
            transition: var(--transition);
        }

        .info-card:hover {
            transform: translateY(-5px);
        }

        .info-card h3 {
            margin-bottom: 10px;
            color: var(--primary);
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .info-card h3 i {
            font-size: 1.2rem;
        }

        

        .notification {
            position: fixed;
            top: 20px;
            right: 20px;
            padding: 15px 25px;
            background: var(--primary);
            color: white;
            border-radius: 8px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.15);
            transform: translateX(150%);
            transition: transform 0.3s ease;
            z-index: 1000;
        }

        .notification.show {
            transform: translateX(0);
        }

        @media (max-width: 600px) {
            h1 {
                font-size: 2.2rem;
            }
            
            .calculator-container {
                padding: 0 10px;
            }
            
            .calculator-card, .info-section {
                padding: 20px;
            }
            
            .theme-toggle {
                position: relative;
                top: auto;
                right: auto;
                margin-bottom: 20px;
                justify-content: center;
                width: 100%;
            }
        }


 /* ===== ARTICLE SPECIFIC STYLES - NO BODY STYLES ===== */
 #percentage-guide-article {
      width: 95%;
      margin: 0 auto;
      padding: 2rem 1.5rem 3rem 1.5rem;
      font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    }

    /* Hero Section */
    .percent-guide-hero {
      text-align: center;
      margin-bottom: 2.5rem;
      padding: 2rem 1.5rem;
      background: linear-gradient(135deg, #4361ee 0%, #7209b7 100%);
      border-radius: 32px;
      box-shadow: 0 12px 30px rgba(67, 97, 238, 0.3);
    }

    .percent-guide-hero h2 {
      font-size: 2.6rem;
      font-weight: 800;
      color: white;
      margin-bottom: 1rem;
      letter-spacing: -0.02em;
      font-family: 'Montserrat', serif;
    }

    .percent-guide-hero .percent-hero-sub {
      font-size: 1.2rem;
      color: rgba(255, 255, 255, 0.9);
      max-width: 720px;
      margin: 0 auto;
      line-height: 1.5;
    }

    .percent-guide-meta {
      display: flex;
      justify-content: center;
      gap: 2rem;
      color: rgba(255, 255, 255, 0.8);
      font-weight: 500;
      margin-top: 1.2rem;
      flex-wrap: wrap;
    }

    .percent-guide-meta span i {
      margin-right: 0.5rem;
    }

    /* Main Content */
    .percent-main-content {
      background: white;
      border-radius: 28px;
      padding: 2rem 2rem 2.5rem 2rem;
      box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
      border: 1px solid rgba(67, 97, 238, 0.15);
    }

    .percent-main-content h2 {
      font-size: 1.8rem;
      font-weight: 700;
      margin-top: 2rem;
      margin-bottom: 1rem;
      color: #4361ee;
      border-left: 5px solid #7209b7;
      padding-left: 1rem;
      font-family: 'Montserrat', serif;
    }

    .percent-main-content h2:first-of-type {
      margin-top: 0;
    }

    .percent-main-content h3 {
      font-size: 1.35rem;
      font-weight: 600;
      margin: 1.5rem 0 0.75rem 0;
      color: #7209b7;
    }

    .percent-main-content p {
      font-size: 1.05rem;
      color: #2d3748;
      margin-bottom: 1.2rem;
      line-height: 1.6;
    }

    .percent-main-content ul, .percent-main-content ol {
      margin: 1rem 0 1.2rem 1.8rem;
      color: #2d3748;
      line-height: 1.6;
    }

    .percent-main-content li {
      margin-bottom: 0.5rem;
    }

    .percent-highlight-box {
      background: linear-gradient(135deg, rgba(67, 97, 238, 0.08), rgba(114, 9, 183, 0.05));
      border-left: 6px solid #7209b7;
      padding: 1.25rem 1.5rem;
      border-radius: 20px;
      margin: 1.75rem 0;
    }

    .percent-pro-tip {
      background: rgba(114, 9, 183, 0.1);
      border-radius: 20px;
      padding: 1.2rem 1.5rem;
      margin: 1.5rem 0;
      display: flex;
      gap: 1rem;
      align-items: flex-start;
      border: 1px solid rgba(67, 97, 238, 0.3);
    }

    .percent-pro-tip i {
      font-size: 1.8rem;
      color: #7209b7;
    }

    .percent-stats-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 1.2rem;
      margin: 2rem 0;
    }

    .percent-stat-card {
      background: #f8f9fa;
      border-radius: 20px;
      padding: 1.2rem;
      text-align: center;
      transition: all 0.2s;
      border: 1px solid rgba(67, 97, 238, 0.2);
    }

    .percent-stat-card .stat-number {
      font-size: 2rem;
      font-weight: 800;
      color: #4361ee;
      margin-bottom: 0.25rem;
    }

    .percent-quote-block {
      background: #f8f9fa;
      padding: 1.5rem;
      border-radius: 24px;
      text-align: center;
      font-style: italic;
      margin: 1.5rem 0;
      border: 1px solid rgba(67, 97, 238, 0.2);
    }

    .percent-quote-block i {
      font-size: 2rem;
      color: #7209b7;
      margin-bottom: 0.5rem;
      display: inline-block;
    }

    .percent-table-wrapper {
      overflow-x: auto;
      margin: 1.5rem 0;
    }

    .percent-formulas-table {
      width: 100%;
      border-collapse: collapse;
      background: #f8f9fa;
      border-radius: 16px;
      overflow: hidden;
    }

    .percent-formulas-table th, .percent-formulas-table td {
      padding: 12px 16px;
      text-align: left;
      border-bottom: 1px solid rgba(67, 97, 238, 0.2);
    }

    .percent-formulas-table th {
      background: rgba(67, 97, 238, 0.1);
      font-weight: 600;
      color: #4361ee;
    }

    .percent-formulas-table tr:hover {
      background: rgba(114, 9, 183, 0.05);
    }

    .percent-applications-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 1.2rem;
      margin: 1.5rem 0;
    }

    .percent-app-card {
      background: #f8f9fa;
      border-radius: 16px;
      padding: 1.2rem;
      border: 1px solid rgba(67, 97, 238, 0.2);
      transition: all 0.2s;
    }

    .percent-app-card:hover {
      transform: translateY(-3px);
      box-shadow: 0 8px 20px rgba(67, 97, 238, 0.1);
    }

    .percent-app-title {
      font-weight: 700;
      color: #4361ee;
      margin-bottom: 0.5rem;
      font-size: 1.1rem;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    .percent-footer-note {
      margin-top: 2.5rem;
      text-align: center;
      font-size: 0.85rem;
      color: #718096;
      border-top: 1px solid #e2e8f0;
      padding-top: 2rem;
    }

    @media (max-width: 768px) {
      .percent-guide-hero h2 {
        font-size: 2rem;
      }
      .percent-main-content {
        padding: 1.5rem;
      }
      #percentage-guide-article {
        padding: 1rem;
      }
    }