:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #eef2ff;
    --accent: #a855f7;
    --bg: #f8fafc;
    --card-bg: #ffffff;
    --text: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-hover: 0 10px 25px rgba(0,0,0,0.1), 0 4px 10px rgba(0,0,0,0.06);
}

body {
    background-color: var(--bg);
    color: var(--text);
    font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
}

/* Navbar */
.navbar {
    background: linear-gradient(135deg, var(--primary), var(--accent)) !important;
    box-shadow: 0 2px 10px rgba(99, 102, 241, 0.3);
    padding: 0.75rem 0;
}
.navbar-brand {
    font-weight: 700;
    font-size: 1.3rem;
}
.navbar-dark .navbar-nav .nav-link {
    color: rgba(255,255,255,0.9);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: all 0.2s;
}
.navbar-dark .navbar-nav .nav-link:hover,
.navbar-dark .navbar-nav .nav-link:focus {
    color: #fff;
    background: rgba(255,255,255,0.15);
}
.dropdown-menu {
    border: none;
    box-shadow: 0 10px 30px rgba(0,0,0,0.12);
    border-radius: 12px;
    padding: 0.5rem;
}
.dropdown-item {
    border-radius: 8px;
    padding: 0.45rem 1rem;
    font-size: 0.9rem;
    transition: all 0.15s;
}
.dropdown-item:hover {
    background-color: var(--primary-light);
    color: var(--primary);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-light), #f5f3ff);
    padding: 3rem 0;
    margin: -1.5rem 0 2rem 0;
    border-radius: 0 0 2rem 2rem;
}
.hero h1 {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 800;
    font-size: 2.5rem;
}

/* Cards */
.tool-card {
    background: var(--card-bg);
    border-radius: 16px !important;
    box-shadow: var(--shadow);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}
.tool-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}
.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    opacity: 0;
    transition: opacity 0.3s;
}
.tool-card:hover::before {
    opacity: 1;
}
.category-icon {
    font-size: 2rem;
    color: var(--primary);
    transition: transform 0.3s;
}
.tool-card:hover .category-icon {
    transform: scale(1.15);
}
.card-title {
    color: var(--text);
    font-weight: 600;
    font-size: 1rem;
}
.card-text {
    font-size: 0.85rem;
}

/* Footer */
footer {
    background: var(--card-bg);
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Search */
.input-group-lg .form-control:focus {
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
    border-color: var(--primary);
}
.input-group-text {
    border-right: none;
}

/* Section headers */
section h5 {
    color: var(--text);
}
.badge.bg-light {
    background-color: var(--primary-light) !important;
    color: var(--primary) !important;
}

/* Tool pages - common */
.tool-container {
    max-width: 700px;
    margin: 0 auto;
}
.tool-header {
    text-align: center;
    margin-bottom: 2rem;
}
.tool-header h1 {
    font-weight: 800;
    color: var(--text);
    font-size: 2rem;
}
.tool-header h4 {
    font-weight: 700;
    color: var(--text);
}
.tool-header p {
    color: var(--text-muted);
}
.tool-card-large {
    background: var(--card-bg);
    border-radius: 16px;
    box-shadow: var(--shadow);
    padding: 2rem;
}
.form-label {
    font-weight: 500;
    color: var(--text);
}
.form-control, .form-select {
    border: 1.5px solid var(--border);
    border-radius: 10px;
    padding: 0.6rem 1rem;
}
.form-control:focus, .form-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}
.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border: none;
    border-radius: 10px;
    padding: 0.6rem 1.5rem;
    font-weight: 600;
    transition: all 0.2s;
}
.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}
.btn-outline-primary {
    border: 1.5px solid var(--primary);
    color: var(--primary);
    border-radius: 10px;
    font-weight: 500;
}
.btn-outline-primary:hover {
    background: var(--primary);
    color: #fff;
}
.btn-success {
    border-radius: 10px;
    font-weight: 500;
}
.result-box {
    background: var(--primary-light);
    border-radius: 12px;
    padding: 1.25rem;
    border-left: 4px solid var(--primary);
    margin-top: 1rem;
}
.result-box .result-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary);
}
.result-box .result-label {
    color: var(--text-muted);
    font-size: 0.9rem;
}
.copy-btn {
    position: absolute;
    right: 10px;
    top: 10px;
}

/* Hashtags */
.hashtag-badge {
    font-size: .78rem !important;
    color: #6366f1 !important;
    background: #eef2ff !important;
    padding: 4px 10px !important;
    border-radius: 6px !important;
    font-weight: 500 !important;
}
.hashtag-badge:hover {
    background: #e0e7ff !important;
}