/* サンプルスタイル */
        .btn-basic {
            background: #0075c1;
            color: white;
            padding: 12px 30px;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            font-size: 16px;
            transition: background 0.3s ease;
        }

        .btn-basic:hover {
            background: #005a99;
        }

        .btn-border {
            background: transparent;
            color: #0075c1;
            padding: 12px 30px;
            border: 2px solid #0075c1;
            border-radius: 5px;
            cursor: pointer;
            font-size: 16px;
            transition: all 0.3s ease;
        }

        .btn-border:hover {
            background: #0075c1;
            color: white;
        }

        .btn-gradient {
            background: linear-gradient(135deg, #0075c1 0%, #00a8e8 100%);
            color: white;
            padding: 12px 30px;
            border: none;
            border-radius: 25px;
            cursor: pointer;
            font-size: 16px;
            box-shadow: 0 4px 15px rgba(0,117,193,0.4);
            transition: transform 0.3s ease;
        }

        .btn-gradient:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(0,117,193,0.5);
        }

        .btn-3d {
            background: #0075c1;
            color: white;
            padding: 12px 30px;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            font-size: 16px;
            box-shadow: 0 5px 0 #005088;
            transition: all 0.1s ease;
        }

        .btn-3d:active {
            transform: translateY(3px);
            box-shadow: 0 2px 0 #005088;
        }

        .card-simple {
            background: white;
            padding: 20px;
            border-radius: 10px;
            border-left: 4px solid #0075c1;
            box-shadow: 0 2px 8px rgba(0,0,0,0.1);
        }

        .card-hover {
            background: white;
            padding: 20px;
            border-radius: 10px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.1);
            transition: all 0.3s ease;
            cursor: pointer;
        }

        .card-hover:hover {
            transform: scale(1.05);
            box-shadow: 0 8px 25px rgba(0,117,193,0.3);
        }

        .card-gradient {
            background: linear-gradient(135deg, #0075c1 0%, #00a8e8 100%);
            color: white;
            padding: 20px;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,117,193,0.3);
        }

        @keyframes bounce {
            0%, 100% { transform: translateY(0); }
            50% { transform: translateY(-20px); }
        }

        .anim-bounce {
            width: 60px;
            height: 60px;
            background: #0075c1;
            border-radius: 50%;
            animation: bounce 1s infinite;
        }

        @keyframes spin {
            from { transform: rotate(0deg); }
            to { transform: rotate(360deg); }
        }

        .anim-spin {
            width: 60px;
            height: 60px;
            border: 5px solid #e0e0e0;
            border-top-color: #0075c1;
            border-radius: 50%;
            animation: spin 1s linear infinite;
        }

        @keyframes pulse {
            0%, 100% { transform: scale(1); opacity: 1; }
            50% { transform: scale(1.2); opacity: 0.7; }
        }

        .anim-pulse {
            width: 60px;
            height: 60px;
            background: #0075c1;
            border-radius: 50%;
            animation: pulse 1.5s infinite;
        }

        .bg-gradient {
            width: 100%;
            height: 80px;
            background: linear-gradient(135deg, #0075c1 0%, #00a8e8 100%);
            border-radius: 8px;
        }

        .bg-dots {
            width: 100%;
            height: 80px;
            background-color: #0075c1;
            background-image: radial-gradient(circle, rgba(255,255,255,0.3) 1px, transparent 1px);
            background-size: 20px 20px;
            border-radius: 8px;
        }

        .bg-stripes {
            width: 100%;
            height: 80px;
            background: repeating-linear-gradient(
                45deg,
                #0075c1,
                #0075c1 10px,
                #0091d9 10px,
                #0091d9 20px
            );
            border-radius: 8px;
        }

        .text-shadow {
            font-size: 24px;
            font-weight: bold;
            color: #0075c1;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
        }

        .text-gradient {
            font-size: 24px;
            font-weight: bold;
            background: linear-gradient(135deg, #0075c1 0%, #00a8e8 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .text-outline {
            font-size: 24px;
            font-weight: bold;
            color: white;
            text-shadow: 
                -1px -1px 0 #0075c1,
                1px -1px 0 #0075c1,
                -1px 1px 0 #0075c1,
                1px 1px 0 #0075c1;
        }

        .btn-neon {
            background: transparent;
            color: #0075c1;
            padding: 12px 30px;
            border: 2px solid #0075c1;
            border-radius: 5px;
            cursor: pointer;
            font-size: 16px;
            text-shadow: 0 0 10px #0075c1;
            box-shadow: 0 0 20px rgba(0,117,193,0.5), inset 0 0 20px rgba(0,117,193,0.2);
            transition: all 0.3s ease;
        }

        .btn-neon:hover {
            background: #0075c1;
            color: white;
            box-shadow: 0 0 30px rgba(0,117,193,0.8), inset 0 0 30px rgba(255,255,255,0.3);
        }

        .btn-pulse-animation {
            background: #0075c1;
            color: white;
            padding: 12px 30px;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            font-size: 16px;
            animation: buttonPulse 2s infinite;
        }

        @keyframes buttonPulse {
            0%, 100% { 
                box-shadow: 0 0 0 0 rgba(0,117,193,0.7);
                transform: scale(1);
            }
            50% { 
                box-shadow: 0 0 0 15px rgba(0,117,193,0);
                transform: scale(1.05);
            }
        }

        .btn-slide {
            background: transparent;
            color: #0075c1;
            padding: 12px 30px;
            border: 2px solid #0075c1;
            border-radius: 5px;
            cursor: pointer;
            font-size: 16px;
            position: relative;
            overflow: hidden;
            transition: color 0.3s ease;
            z-index: 1;
        }

        .btn-slide::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: #0075c1;
            transition: left 0.3s ease;
            z-index: -1;
        }

        .btn-slide:hover {
            color: white;
        }

        .btn-slide:hover::before {
            left: 0;
        }

        .card-flip {
            background: white;
            padding: 20px;
            border-radius: 10px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.1);
            transition: all 0.6s ease;
            cursor: pointer;
            transform-style: preserve-3d;
        }

        .card-flip:hover {
            transform: rotateY(180deg);
        }

        .card-neon-border {
            background: #1a1a1a;
            color: #0075c1;
            padding: 20px;
            border-radius: 10px;
            border: 2px solid #0075c1;
            box-shadow: 0 0 20px rgba(0,117,193,0.5), inset 0 0 20px rgba(0,117,193,0.1);
            position: relative;
        }

        .card-neon-border::before {
            content: '';
            position: absolute;
            top: -2px;
            left: -2px;
            right: -2px;
            bottom: -2px;
            background: linear-gradient(45deg, #0075c1, #00a8e8, #0075c1);
            border-radius: 10px;
            opacity: 0;
            transition: opacity 0.3s ease;
            z-index: -1;
            animation: neonRotate 3s linear infinite;
        }

        .card-neon-border:hover::before {
            opacity: 1;
        }

        @keyframes neonRotate {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        @keyframes shake {
            0%, 100% { transform: translateX(0); }
            10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
            20%, 40%, 60%, 80% { transform: translateX(5px); }
        }

        .anim-shake {
            width: 60px;
            height: 60px;
            background: #0075c1;
            border-radius: 50%;
            animation: shake 2s infinite;
        }

        @keyframes float {
            0%, 100% { transform: translateY(0px); }
            50% { transform: translateY(-20px); }
        }

        .anim-float {
            width: 60px;
            height: 60px;
            background: #0075c1;
            border-radius: 50%;
            animation: float 3s ease-in-out infinite;
        }

        @keyframes heartbeat {
            0%, 100% { transform: scale(1); }
            10%, 30% { transform: scale(1.1); }
            20%, 40% { transform: scale(1); }
        }

        .anim-heartbeat {
            width: 60px;
            height: 60px;
            background: #0075c1;
            border-radius: 50%;
            animation: heartbeat 1.5s infinite;
        }

        .bg-animated-gradient {
            width: 100%;
            height: 80px;
            background: linear-gradient(270deg, #0075c1, #00a8e8, #0075c1);
            background-size: 400% 400%;
            border-radius: 8px;
            animation: gradientShift 3s ease infinite;
        }

        @keyframes gradientShift {
            0%, 100% { background-position: 0% 50%; }
            50% { background-position: 100% 50%; }
        }

        .bg-waves {
            width: 100%;
            height: 80px;
            background: #0075c1;
            border-radius: 8px;
            position: relative;
            overflow: hidden;
        }

        .bg-waves::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 200%;
            height: 100%;
            background: repeating-linear-gradient(
                90deg,
                transparent,
                transparent 40px,
                rgba(255,255,255,0.1) 40px,
                rgba(255,255,255,0.1) 80px
            );
            animation: waveMove 3s linear infinite;
        }

        @keyframes waveMove {
            0% { transform: translateX(0); }
            100% { transform: translateX(50%); }
        }

        .text-glitch {
            font-size: 24px;
            font-weight: bold;
            color: #0075c1;
            position: relative;
            animation: glitch 1s infinite;
        }

        @keyframes glitch {
            0%, 100% { transform: translate(0); }
            20% { transform: translate(-2px, 2px); }
            40% { transform: translate(-2px, -2px); }
            60% { transform: translate(2px, 2px); }
            80% { transform: translate(2px, -2px); }
        }

        .text-neon {
            font-size: 24px;
            font-weight: bold;
            color: #0075c1;
            text-shadow: 
                0 0 10px #0075c1,
                0 0 20px #0075c1,
                0 0 30px #0075c1,
                0 0 40px #00a8e8;
            animation: neonFlicker 1.5s infinite alternate;
        }

        @keyframes neonFlicker {
            0%, 19%, 21%, 23%, 25%, 54%, 56%, 100% {
                text-shadow: 
                    0 0 10px #0075c1,
                    0 0 20px #0075c1,
                    0 0 30px #0075c1,
                    0 0 40px #00a8e8;
            }
            20%, 24%, 55% {
                text-shadow: none;
            }
        }

        /* カテゴリナビゲーション */
        .category-nav {
            background: var(--bg-gray);
            border-radius: var(--radius-large);
            padding: 40px;
            margin-bottom: 40px;
            border: 2px solid var(--border-color);
        }

        .category-nav-header {
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 15px;
        }

        .category-nav-emoji {
            font-size: 2.5em;
            margin-right: 15px;
        }

        .category-nav-title {
            font-size: 1.8em;
            font-weight: 700;
            color: var(--text-dark);
        }

        .category-nav-subtitle {
            text-align: center;
            color: #7f8c8d;
            margin-bottom: 30px;
            font-size: 1.1em;
        }

        .category-buttons {
            display: grid;
            grid-template-columns: repeat(4, 1fr);  /* PCで4列 */
            gap: 20px;
        }

/* タブレット対応 */
@media (max-width: 1024px) {
    .category-buttons {
        grid-template-columns: repeat(3, 1fr);  /* タブレットで3列 */
    }
}

/* スマホ対応 - 1列でコンパクトに */
@media (max-width: 768px) {
    .category-buttons {
        grid-template-columns: 1fr !important;
        gap: 15px;
    }
    
    .category-button-item {
        padding: 20px 15px;  /* パディングを縮小 */
    }
    
    .category-button-icon {
        font-size: 2em;  /* アイコンを小さく */
        margin-bottom: 10px;
    }
    
    .category-button-name {
        font-size: 1em;  /* テキストを小さく */
        margin-bottom: 8px;
    }
    
    .category-button-arrow {
        font-size: 1.2em;  /* 矢印を小さく */
        margin: 5px 0;
    }
    
    .category-button-link {
        padding: 6px 14px;  /* ボタンを小さく */
        font-size: 0.9em;
        margin-bottom: 8px;
    }
    
    .category-button-desc {
        font-size: 0.85em;
    }
}


        .category-button-item {
            background: white;
            border: 2px solid var(--primary-color);
            border-radius: var(--radius-medium);
            padding: 25px;
            text-align: center;
            transition: all 0.3s ease;
        }

        .category-button-item:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-medium);
        }

        .category-button-icon {
            font-size: 2.5em;
            margin-bottom: 15px;
        }

        .category-button-name {
            font-weight: 600;
            color: var(--text-dark);
            margin-bottom: 10px;
            font-size: 1.1em;
        }

        .category-button-arrow {
            font-size: 1.5em;
            color: var(--primary-color);
            margin: 8px 0;
            font-weight: bold;
        }

        .category-button-link {
            background: var(--primary-color);
            color: white;
            padding: 8px 16px;
            border-radius: 20px;
            font-weight: 600;
            margin-bottom: 10px;
            display: inline-block;
            text-decoration: none;
            transition: all 0.3s ease;
        }

        .category-button-link:hover {
            background: var(--primary-light);
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(0, 117, 193, 0.3);
            text-decoration: none;
            color: white;
        }

        .category-button-desc {
            font-size: 0.9em;
            color: var(--text-gray);
            font-style: italic;
        }

        /* カラーパレット */
        .palette-section {
            margin-bottom: 30px;
        }

        .palette-title {
            font-size: 1.2em;
            font-weight: 600;
            color: var(--text-dark);
            margin-bottom: 15px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--border-color);
        }

        .color-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
            gap: 15px;
        }

        .color-item {
            cursor: pointer;
            border-radius: var(--radius-small);
            overflow: hidden;
            transition: all 0.3s ease;
            border: 2px solid var(--border-color);
            position: relative;
        }

        .color-item:hover {
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.2);
            border-color: var(--primary-color);
        }

        .color-item.copied {
            animation: copyFlash 0.5s ease;
        }

        @keyframes copyFlash {
            0%, 100% { transform: scale(1); }
            50% { transform: scale(1.05); box-shadow: 0 0 20px rgba(0,117,193,0.5); }
        }

        .color-preview {
            height: 80px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.8em;
            color: white;
            text-shadow: 0 1px 3px rgba(0,0,0,0.3);
            font-weight: 600;
        }

        .color-info {
            background: white;
            padding: 10px;
            text-align: center;
        }

        .color-name {
            font-size: 0.85em;
            font-weight: 600;
            color: var(--text-dark);
            margin-bottom: 3px;
        }

        .color-code {
            font-size: 0.75em;
            color: var(--text-gray);
            font-family: 'Courier New', monospace;
        }

        .copy-notification {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background: var(--primary-color);
            color: white;
            padding: 15px 25px;
            border-radius: var(--radius-medium);
            box-shadow: 0 5px 20px rgba(0,117,193,0.4);
            display: none;
            align-items: center;
            gap: 10px;
            font-weight: 600;
            z-index: 1001;
            animation: slideIn 0.3s ease;
        }

        .copy-notification.show {
            display: flex;
        }

        @keyframes slideIn {
            from { transform: translateX(400px); opacity: 0; }
            to { transform: translateX(0); opacity: 1; }
        }

        .category {
            background: white;
            border-radius: var(--radius-large);
            padding: 30px;
            box-shadow: var(--shadow-light);
        }

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

        .sample-card {
            border: 2px solid var(--border-color);
            border-radius: var(--radius-medium);
            padding: 20px;
            background: var(--bg-gray);
            transition: all 0.3s ease;
        }

        .sample-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-medium);
            border-color: var(--primary-color);
        }

        .sample-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 15px;
        }

        .sample-title {
            font-weight: 600;
            color: var(--text-dark);
            font-size: 1.1em;
        }

        .difficulty {
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 0.85em;
            font-weight: 600;
        }

        .easy {
            background: #4CAF50;
            color: white;
        }

        .medium {
            background: #FF9800;
            color: white;
        }

        .hard {
            background: #f44336;
            color: white;
        }

        .sample-preview {
            background: white;
            padding: 30px;
            border-radius: var(--radius-small);
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 120px;
            margin-bottom: 15px;
            border: 1px solid var(--border-color);
        }

        .color-picker-container {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 10px;
            padding: 10px;
            background: white;
            border-radius: var(--radius-small);
            border: 1px solid var(--border-color);
        }

        .color-picker-label {
            font-size: 0.85em;
            color: var(--text-dark);
            font-weight: 600;
        }

        .color-picker-input {
            width: 40px;
            height: 40px;
            border: 2px solid var(--border-color);
            border-radius: var(--radius-small);
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .color-picker-input:hover {
            border-color: var(--primary-color);
            transform: scale(1.1);
        }

        .color-value-display {
            font-family: 'Courier New', monospace;
            font-size: 0.85em;
            color: var(--text-gray);
            background: var(--bg-gray);
            padding: 5px 10px;
            border-radius: 4px;
        }

        .code-button {
            width: 100%;
            background: var(--primary-color);
            color: white;
            border: none;
            padding: 12px;
            border-radius: var(--radius-small);
            cursor: pointer;
            font-size: 14px;
            font-weight: 600;
            transition: all 0.3s ease;
        }

        .code-button:hover {
            background: var(--primary-light);
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(0, 117, 193, 0.3);
        }

        /* モーダル */
        .modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.7);
            z-index: 1000;
            justify-content: center;
            align-items: center;
            padding: 20px;
        }

        .modal.active {
            display: flex;
        }

        .modal-content {
            background: white;
            border-radius: var(--radius-large);
            padding: 30px;
            max-width: 700px;
            width: 100%;
            max-height: 80vh;
            overflow-y: auto;
            position: relative;
        }

        .modal-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
            padding-bottom: 15px;
            border-bottom: 3px solid var(--primary-color);
        }

        .modal-title {
            font-size: 1.5em;
            color: var(--primary-color);
            font-weight: 600;
        }

        .close-button {
            background: none;
            border: none;
            font-size: 28px;
            cursor: pointer;
            color: #666;
            line-height: 1;
            padding: 0;
            width: 30px;
            height: 30px;
        }

        .close-button:hover {
            color: var(--primary-color);
        }

        .code-section {
            margin-bottom: 20px;
        }

        .code-label {
            font-weight: 600;
            color: var(--text-dark);
            margin-bottom: 8px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .copy-button {
            background: var(--primary-color);
            color: white;
            border: none;
            padding: 6px 12px;
            border-radius: var(--radius-small);
            cursor: pointer;
            font-size: 12px;
            font-weight: 600;
            transition: all 0.3s ease;
        }

        .copy-button:hover {
            background: var(--primary-light);
        }

        .copy-button.copied {
            background: #4CAF50;
        }

        pre {
            background: #f5f5f5;
            border: 1px solid #ddd;
            border-radius: var(--radius-small);
            padding: 15px;
            overflow-x: auto;
            font-size: 13px;
            line-height: 1.5;
        }

        code {
            font-family: 'Courier New', monospace;
        }

        @media (max-width: 768px) {
            .samples-grid {
                grid-template-columns: 1fr;
            }
        }
/* スマホ対応: タッチ時の効果 */
.card-hover.touch-active {
    transform: scale(1.05);
    box-shadow: 0 8px 25px rgba(0,117,193,0.3);
}

.card-flip {
    transition: transform 0.6s ease;
}

.card-flip.flipped {
    transform: rotateY(180deg);
}

/* ネオンボタンのタッチ対応 */
.btn-neon.touch-active {
    background: #0075c1;
    color: white;
    box-shadow: 0 0 30px rgba(0,117,193,0.8), inset 0 0 30px rgba(255,255,255,0.3);
}

/* スライドボタンのタッチ対応 */
.btn-slide.touch-active {
    color: white;
}

.btn-slide.touch-active::before {
    left: 0;
}

/* タッチデバイス用のメディアクエリ */
@media (hover: none) and (pointer: coarse) {
    /* ホバーカードをタップで動作するように */
    .card-hover:active {
        transform: scale(1.05);
        box-shadow: 0 8px 25px rgba(0,117,193,0.3);
    }
    
    /* フリップカードの説明を追加 */
    .card-flip::after {
        content: 'タップで回転';
        position: absolute;
        bottom: 5px;
        right: 10px;
        font-size: 0.7em;
        color: rgba(0,0,0,0.3);
        pointer-events: none;
    }
}
/* 見出しデザイン - 初級 */
.heading-underline {
    font-size: 28px;
    font-weight: bold;
    color: #333;
    padding-bottom: 10px;
    border-bottom: 4px solid #0075c1;
    margin: 20px 0;
    display: inline-block;
}

.heading-left-border {
    font-size: 28px;
    font-weight: bold;
    color: #333;
    padding-left: 20px;
    border-left: 6px solid #0075c1;
    margin: 20px 0;
}

.heading-dotted {
    font-size: 28px;
    font-weight: bold;
    color: #333;
    padding-bottom: 10px;
    border-bottom: 3px dotted #0075c1;
    margin: 20px 0;
    display: inline-block;
}

.heading-double {
    font-size: 28px;
    font-weight: bold;
    color: #333;
    padding-bottom: 10px;
    border-bottom: 4px double #0075c1;
    margin: 20px 0;
    display: inline-block;
}

/* 見出しデザイン - 中級 */
.heading-top-bottom {
    font-size: 28px;
    font-weight: bold;
    color: #333;
    padding: 12px 0;
    border-top: 3px solid #0075c1;
    border-bottom: 3px solid #0075c1;
    margin: 20px 0;
    display: inline-block;
}

.heading-dots {
    font-size: 28px;
    font-weight: bold;
    color: #333;
    margin: 20px 0;
    display: inline-block;
    position: relative;
    padding: 0 30px;
}

.heading-dots::before,
.heading-dots::after {
    content: '●';
    color: #0075c1;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    font-size: 14px;
}

.heading-dots::before {
    left: 0;
}

.heading-dots::after {
    right: 0;
}

.heading-corner {
    font-size: 28px;
    font-weight: bold;
    color: #333;
    margin: 20px 0;
    display: inline-block;
    position: relative;
    padding: 15px 25px;
}

.heading-corner::before,
.heading-corner::after {
    content: '';
    position: absolute;
    width: 30px;
    height: 30px;
    border: 3px solid #0075c1;
}

.heading-corner::before {
    top: 0;
    left: 0;
    border-right: none;
    border-bottom: none;
}

.heading-corner::after {
    bottom: 0;
    right: 0;
    border-left: none;
    border-top: none;
}

.heading-bg-gradient {
    font-size: 28px;
    font-weight: bold;
    color: white;
    background: linear-gradient(135deg, #0075c1 0%, #00a8e8 100%);
    padding: 12px 25px;
    margin: 20px 0;
    display: inline-block;
    border-radius: 4px;
}

/* 見出しデザイン - 上級 */
.heading-animated-line {
    font-size: 28px;
    font-weight: bold;
    color: #333;
    margin: 20px 0;
    display: inline-block;
    position: relative;
    padding-bottom: 10px;
    cursor: pointer;
}

.heading-animated-line::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 4px;
    background: #0075c1;
    transition: width 0.5s ease;
}

.heading-animated-line:hover::after {
    width: 100%;
}

.heading-gradient-shadow {
    font-size: 28px;
    font-weight: bold;
    background: linear-gradient(135deg, #0075c1 0%, #00a8e8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 20px 0;
    display: inline-block;
    filter: drop-shadow(2px 2px 3px rgba(0,117,193,0.4));
}

.heading-3d {
    font-size: 28px;
    font-weight: bold;
    color: #0075c1;
    margin: 20px 0;
    display: inline-block;
    text-shadow: 
        1px 1px 0 #005a99,
        2px 2px 0 #005a99,
        3px 3px 0 #005a99,
        4px 4px 5px rgba(0,0,0,0.3);
}

@keyframes neonPulse {
    0%, 100% {
        text-shadow: 
            0 0 10px rgba(0,117,193,0.8),
            0 0 20px rgba(0,117,193,0.6),
            0 0 30px rgba(0,117,193,0.4),
            0 0 40px rgba(0,117,193,0.2);
    }
    50% {
        text-shadow: 
            0 0 20px rgba(0,117,193,1),
            0 0 30px rgba(0,117,193,0.8),
            0 0 40px rgba(0,117,193,0.6),
            0 0 50px rgba(0,117,193,0.4);
    }
}

.heading-neon {
    font-size: 28px;
    font-weight: bold;
    color: #0075c1;
    margin: 20px 0;
    display: inline-block;
    text-shadow: 
        0 0 10px rgba(0,117,193,0.8),
        0 0 20px rgba(0,117,193,0.6),
        0 0 30px rgba(0,117,193,0.4),
        0 0 40px rgba(0,117,193,0.2);
    animation: neonPulse 2s ease-in-out infinite;
}