:root {
    --primary-bg: #0f172a; /* Dark Blue */
    --accent: #fbbf24; /* Gold */
    --card-bg: rgba(255, 255, 255, 0.05);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
}

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

body {
    font-family: 'Inter', sans-serif;
    background: var(--primary-bg);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background-image: radial-gradient(circle at top right, #1e293b, #0f172a);
}

.container {
    width: 90%;
    max-width: 1000px;
    padding: 2rem;
}

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

header h1 {
    font-size: 3rem;
    color: var(--accent);
    margin-bottom: 0.5rem;
    text-shadow: 0 4px 15px rgba(251, 191, 36, 0.2);
}

header p {
    color: var(--text-muted);
    font-size: 1.1rem;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.glassmorphism {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.glassmorphism:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px 0 rgba(0, 0, 0, 0.4);
}

.tool-card h2 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-main);
    border-bottom: 2px solid var(--accent);
    padding-bottom: 0.5rem;
    display: inline-block;
}

.tool-content {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

label {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.input-field {
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    padding: 0.8rem 1rem;
    color: white;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.3s ease;
}

.input-field:focus {
    border-color: var(--accent);
}

.input-field::-webkit-calendar-picker-indicator {
    filter: invert(1);
    cursor: pointer;
}

.primary-btn {
    background: var(--accent);
    color: #0f172a;
    border: none;
    border-radius: 10px;
    padding: 1rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s ease, transform 0.1s ease;
    margin-top: 0.5rem;
}

.primary-btn:hover {
    background: #f59e0b;
}

.primary-btn:active {
    transform: scale(0.98);
}

.result-box {
    margin-top: 1rem;
    padding: 1rem;
    background: rgba(251, 191, 36, 0.1);
    border-left: 4px solid var(--accent);
    border-radius: 0 10px 10px 0;
    font-size: 1.1rem;
    animation: fadeIn 0.5s ease forwards;
}

.hidden {
    display: none !important;
}

.loader {
    border: 3px solid rgba(255,255,255,0.1);
    border-top: 3px solid var(--accent);
    border-radius: 50%;
    width: 24px;
    height: 24px;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

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

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