:root {
    --bg-color: #0f172a;
    --text-color: #f8fafc;
    --card-bg: rgba(30, 41, 59, 0.7);
    --border-color: rgba(255, 255, 255, 0.1);
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --accent-color: #8b5cf6;
    --success-color: #10b981;
    --success-bg: rgba(16, 185, 129, 0.1);
    --error-color: #ef4444;
    --error-bg: rgba(239, 68, 68, 0.1);
    --warning-color: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    overflow-x: hidden;
}

/* Background Blobs */
.background-elements {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: -1;
}

.blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.5;
    animation: float 10s infinite ease-in-out alternate;
}

.blob-1 {
    top: -10%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, var(--accent-color), transparent);
}

.blob-2 {
    bottom: -10%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--primary-color), transparent);
    animation-delay: -5s;
}

@keyframes float {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(50px, 50px) scale(1.1); }
}

/* Container */
.container {
    width: 100%;
    max-width: 800px;
    padding: 2rem;
    z-index: 1;
}

header {
    text-align: center;
    margin-bottom: 3rem;
}

h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    letter-spacing: -1px;
}

.accent {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

header p {
    color: #94a3b8;
    font-size: 1.1rem;
}

/* Main Content */
main {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

/* Tabs */
.tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 2rem;
}

.tab-btn {
    flex: 1;
    background: transparent;
    border: none;
    color: #94a3b8;
    padding: 1rem;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    border-bottom: 2px solid transparent;
}

.tab-btn:hover {
    color: var(--text-color);
}

.tab-btn.active {
    color: var(--text-color);
    border-bottom-color: var(--primary-color);
}

.tab-content {
    display: none;
    animation: fadeIn 0.4s ease forwards;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Forms */
.input-group {
    display: flex;
    gap: 1rem;
}

.input-group.vertical {
    flex-direction: column;
}

input[type="email"], textarea {
    flex: 1;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    color: var(--text-color);
    font-size: 1rem;
    font-family: 'Inter', sans-serif;
    transition: all 0.3s ease;
}

input[type="email"]:focus, textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

textarea {
    resize: vertical;
}

.primary-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    border: none;
    border-radius: 8px;
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(59, 130, 246, 0.4);
}

.primary-btn:active {
    transform: translateY(0);
}

.primary-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

/* Results */
.result-card {
    margin-top: 1.5rem;
    padding: 1.5rem;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 1rem;
    border: 1px solid var(--border-color);
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.status-icon {
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
}

.result-card.valid {
    background: var(--success-bg);
    border-color: var(--success-color);
}
.result-card.valid .status-icon { color: var(--success-color); }

.result-card.invalid {
    background: var(--error-bg);
    border-color: var(--error-color);
}
.result-card.invalid .status-icon { color: var(--error-color); }

.result-card.unsure {
    background: var(--warning-bg);
    border-color: var(--warning-color);
}
.result-card.unsure .status-icon { color: var(--warning-color); }

.result-details h3 {
    font-size: 1.1rem;
    margin-bottom: 0.25rem;
}

.result-details p {
    color: #94a3b8;
    font-size: 0.9rem;
}

/* Bulk Stats */
.bulk-stats {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
    flex-wrap: wrap;
}

.stat {
    flex: 1;
    background: rgba(15, 23, 42, 0.4);
    padding: 1rem;
    border-radius: 8px;
    text-align: center;
    border: 1px solid var(--border-color);
}

.stat .label {
    display: block;
    font-size: 0.85rem;
    color: #94a3b8;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 0.5rem;
}

.stat .value {
    font-size: 1.5rem;
    font-weight: 700;
}

.valid-stat .value { color: var(--success-color); }
.invalid-stat .value { color: var(--error-color); }
.unsure-stat .value { color: var(--warning-color); }

/* Table */
.table-container {
    margin-top: 1.5rem;
    background: rgba(15, 23, 42, 0.4);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    overflow: hidden;
    max-height: 400px;
    overflow-y: auto;
}

.result-table {
    width: 100%;
    border-collapse: collapse;
}

.result-table th, .result-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.result-table th {
    background: rgba(15, 23, 42, 0.8);
    position: sticky;
    top: 0;
    font-weight: 600;
    color: #94a3b8;
    font-size: 0.9rem;
}

.result-table tr:last-child td {
    border-bottom: none;
}

.badge {
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
}

.badge.valid { background: var(--success-bg); color: var(--success-color); border: 1px solid var(--success-color); }
.badge.invalid { background: var(--error-bg); color: var(--error-color); border: 1px solid var(--error-color); }
.badge.unsure { background: var(--warning-bg); color: var(--warning-color); border: 1px solid var(--warning-color); }

/* Loader */
.loader {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
    display: inline-block;
}

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