:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #60a5fa;
    --primary-bg: #dbeafe;
    --success: #10b981;
    --success-dark: #059669;
    --success-light: #a7f3d0;
    --warning: #f59e0b;
    --warning-dark: #d97706;
    --warning-light: #fef3c7;
    --error: #ef4444;
    --error-dark: #dc2626;
    --error-light: #fee2e2;
    --night-mode: #6d28d9;
    --night-mode-dark: #5b21b6;
    --night-mode-bg: #ddd6fe;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --standard-hours-bg: #e3f2fd;
    --extended-hours-bg: #fff8e1;
    --calendar-btn: #8e24aa;
    --calendar-btn-hover: #7b1fa2;
}
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: var(--gray-900);
    background: var(--gray-100);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem 1rem;
}
.container {
    max-width: 800px;
    width: 100%;
    background: white;
    border-radius: 1rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    margin-bottom: 2rem;
}
.header {
    padding: 2rem;
    text-align: center;
    border-bottom: 1px solid var(--gray-200);
}
.header h1 {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    color: var(--gray-900);
    margin-bottom: 1rem;
}
.header p {
    font-size: clamp(0.875rem, 2vw, 1.125rem);
    color: var(--gray-700);
}
.content {
    padding: 2rem;
}
.form-group {
    margin-bottom: 1.5rem;
}
.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--gray-700);
}
input[type="date"],
select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--gray-300);
    border-radius: 0.5rem;
    font-size: 1rem;
    color: var(--gray-900);
    background-color: white;
    transition: all 0.3s;
}
input[type="date"]:focus,
select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}
.participants-container {
    margin-bottom: 1.5rem;
}
.participant {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    align-items: center;
}
.participant select {
    flex: 1;
}
.night-option {
    margin-left: 12px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.night-option input {
    transform: scale(1.2);
}
.night-option label {
    font-size: 0.9rem;
    color: var(--night-mode);
    font-weight: 500;
}
.remove-participant {
    padding: 0.5rem;
    background: var(--error);
    color: white;
    border: none;
    border-radius: 0.375rem;
    cursor: pointer;
    transition: opacity 0.3s;
}
.remove-participant:hover {
    opacity: 0.9;
}
.add-participant {
    width: 100%;
    padding: 0.75rem;
    background: var(--success);
    color: white;
    border: none;
    border-radius: 0.5rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    margin-bottom: 1.5rem;
}
.add-participant:hover {
    opacity: 0.9;
}
.convert-button {
    width: 100%;
    padding: 1rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 0.5rem;
    font-weight: 600;
    font-size: 1.125rem;
    cursor: pointer;
    transition: all 0.3s;
}
.convert-button:hover {
    background: var(--primary-dark);
}
.results {
    margin-top: 2rem;
    padding: 1.5rem;
    background: var(--gray-50);
    border-radius: 0.5rem;
    display: none;
}
.results h3 {
    margin-bottom: 1rem;
    color: var(--gray-800);
    font-size: 1.25rem;
}
.time-grid {
    display: grid;
    gap: 1rem;
    margin-top: 1rem;
}
.time-slot {
    padding: 0.5rem;
    border-radius: 0.25rem;
    font-size: 0.875rem;
}
.standard-hours {
    background: var(--standard-hours-bg);
    color: var(--gray-800);
}
.extended-hours {
    background: var(--extended-hours-bg);
    color: var(--gray-800);
}
.night-hours {
    background: var(--night-mode-bg);
    color: var(--night-mode-dark);
}
.suggestion {
    margin-top: 1rem;
    padding: 1rem;
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: 0.5rem;
}
.create-event-btn {
    margin-top: 1rem;
    padding: 0.75rem 1.25rem;
    background: var(--calendar-btn);
    color: white;
    border: none;
    border-radius: 0.375rem;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    font-weight: 500;
    font-size: 0.95rem;
    transition: all 0.2s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}
.create-event-btn:hover {
    background: var(--calendar-btn-hover);
    box-shadow: 0 3px 6px rgba(0, 0, 0, 0.15);
    transform: translateY(-1px);
}
.create-event-btn:active {
    transform: translateY(1px);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}
.create-event-btn::before {
    content: "📅";
    margin-right: 8px;
    font-size: 1.1rem;
}
.legend {
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--gray-200);
    font-size: 0.875rem;
    color: var(--gray-700);
}
.legend div {
    margin-bottom: 0.25rem;
}

/* New Footer Styles */
.app-footer {
    background-color: var(--gray-50); /* Light background for footer */
    color: var(--gray-600);
    padding: 2rem 1rem; /* Consistent padding */
    text-align: center;
    border-top: 1px solid var(--gray-200);
    margin-top: auto; /* Pushes footer to the bottom */
    width: 100%; /* Span full width */
}

.footer-content {
    max-width: 800px; /* Align with main container */
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.made-with-love {
    color: var(--gray-700);
    text-decoration: none;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    transition: color 0.3s ease;
}

.made-with-love:hover {
    color: var(--primary);
}

.heart {
    display: inline-block;
    margin: 0 0.3em;
    color: var(--error); /* Red heart */
    animation: pulse 1.5s infinite ease-in-out;
    font-size: 1.1em; /* Slightly larger heart emoji */
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.35);
    }
}

.footer-links {
    display: flex;
    gap: 1.25rem; /* Space between icons */
}

.footer-links a {
    color: var(--gray-500);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: var(--primary);
}

.footer-links svg {
    width: 22px;
    height: 22px;
    vertical-align: middle;
}

/* Responsive adjustments for footer */
@media (max-width: 600px) {
    .footer-content {
        flex-direction: column;
        gap: 1rem;
    }
    .made-with-love {
         margin-bottom: 0.5rem; /* Space when stacked */
    }
}

/* Notification Styles (from JS, centralized here) */
#notification {
    position: fixed;
    bottom: 20px;
    right: 20px;
    padding: 12px 20px;
    border-radius: 4px;
    color: white;
    max-width: 300px;
    box-shadow: 0 3px 6px rgba(0,0,0,0.16);
    z-index: 1000;
    transition: opacity 0.3s ease, transform 0.3s ease;
    opacity: 0;
    transform: translateY(20px);
}
#notification.show {
    opacity: 1;
    transform: translateY(0);
}