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

:root {
    --monokai-pink: #F92672;
    --monokai-purple: #AE81FF;
    --monokai-cyan: #66D9EF;
    --monokai-green: #A6E22E;
    --monokai-orange: #FD971F;
    --monokai-yellow: #E6DB74;
    --monokai-white: #F8F8F2;
    --monokai-light-gray: #75715E;
    --monokai-dark-gray: #49483E;
    --monokai-darker-gray: #3E3D32;
    --monokai-bg: #272822;
    --monokai-bg-dark: #1E1F1C;
    --monokai-bg-darker: #141411;
    --primary-color: var(--monokai-pink);
    --accent-color: var(--monokai-cyan);
    --text-primary: var(--monokai-white);
    --text-secondary: #CFCFC2;
    --text-light: var(--monokai-light-gray);
    --bg-primary: var(--monokai-bg-darker);
    --bg-secondary: var(--monokai-bg-dark);
    --bg-card: var(--monokai-bg);
    --border-color: var(--monokai-dark-gray);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.6), 0 1px 2px 0 rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.7), 0 2px 4px -1px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.8), 0 4px 6px -2px rgba(0, 0, 0, 0.6);
    --gradient-primary: linear-gradient(135deg, var(--monokai-pink) 0%, var(--monokai-purple) 100%);
    --gradient-accent: linear-gradient(135deg, var(--monokai-cyan) 0%, var(--monokai-green) 100%);
}

body {
    font-family: 'Fira Code', 'Monaco', 'Menlo', monospace;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    background-image: 
        radial-gradient(circle at 25% 25%, rgba(249, 38, 114, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 75% 75%, rgba(166, 226, 46, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(102, 217, 239, 0.05) 0%, transparent 50%);
}

.hidden {
    display: none;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-content {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 500px;
    margin: 1rem;
}

.modal-content h2 {
    text-align: center;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    font-weight: 600;
}

.field {
    position: relative;
    margin-bottom: 1.5rem;
}

.field input {
    width: 100%;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-family: 'Fira Code', monospace;
}

.field input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.field i {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-light);
}

button {
    background: var(--gradient-primary);
    color: var(--text-primary);
    border: 1px solid var(--monokai-dark-gray);
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: 'Fira Code', monospace;
    box-shadow: 0 0 0 1px rgba(249, 38, 114, 0.2);
}

button:hover {
    transform: translateY(-1px);
    box-shadow: 0 0 0 1px var(--monokai-pink), 0 0 10px rgba(249, 38, 114, 0.3);
    background: linear-gradient(135deg, var(--monokai-pink) 0%, var(--monokai-purple) 100%);
}

#auth-submit {
    width: 100%;
    justify-content: center;
    margin-bottom: 1rem;
}

#auth-switch {
    text-align: center;
    color: var(--text-light);
}

#auth-switch a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
}

/* Header */
header {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

#username-display {
    color: var(--text-secondary);
    font-weight: 500;
}

.btn-icon {
    background: transparent;
    color: var(--text-light);
    padding: 0.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.btn-icon:hover {
    background: var(--bg-primary);
    color: var(--text-primary);
    transform: none;
    box-shadow: none;
}

/* Main Content */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
}

.current-time {
    background: linear-gradient(135deg, var(--monokai-bg) 0%, var(--monokai-dark-gray) 100%);
    border: 1px solid var(--monokai-darker-gray);
    color: var(--text-primary);
    padding: 2rem;
    border-radius: 16px;
    text-align: center;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

.current-time::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--monokai-cyan), transparent);
    animation: scan 3s linear infinite;
}

@keyframes scan {
    0% { left: -100%; }
    100% { left: 100%; }
}

.date-navigation {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 0.5rem;
}

.date-nav-btn {
    background: none;
    border: 1px solid var(--monokai-dark-gray);
    color: var(--text-secondary);
    padding: 0.5rem;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    transition: all 0.2s ease;
}

.date-nav-btn:hover {
    border-color: var(--monokai-cyan);
    color: var(--monokai-cyan);
    transform: translateY(-1px);
}

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

.date-nav-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.date-nav-btn:disabled:hover {
    border-color: var(--monokai-dark-gray);
    color: var(--text-secondary);
}

#current-date {
    font-size: 1.2rem;
    opacity: 0.9;
    min-width: 200px;
    text-align: center;
}

#current-time {
    font-size: 3rem;
    font-weight: 700;
    font-family: 'Fira Code', 'Monaco', 'Menlo', monospace;
    color: var(--monokai-green);
    text-shadow: 0 0 10px rgba(166, 226, 46, 0.3);
}

.add-activity {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
    margin-bottom: 2rem;
}

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

#activity-input {
    flex: 1;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: var(--bg-secondary);
    color: var(--text-primary);
}

#activity-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.btn-primary {
    background: var(--gradient-accent);
    white-space: nowrap;
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-primary);
    color: var(--text-primary);
    border-color: var(--monokai-cyan);
}

.btn-danger {
    background: linear-gradient(135deg, var(--monokai-pink) 0%, #DC143C 100%);
    color: white;
}

.btn-danger:hover {
    background: linear-gradient(135deg, #DC143C 0%, var(--monokai-pink) 100%);
    transform: translateY(-1px);
}

/* Activity Modal */
.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.modal-header h2 {
    margin: 0;
    color: var(--text-primary);
    font-size: 1.5rem;
}

.activity-meta-info {
    background: var(--bg-secondary);
    padding: 1rem;
    border-radius: 8px;
    margin: 1rem 0;
    border: 1px solid var(--border-color);
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.meta-item:last-child {
    margin-bottom: 0;
}

.meta-item i {
    color: var(--monokai-cyan);
    width: 16px;
}

.modal-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 2rem;
    gap: 1rem;
}

.btn-icon {
    width: 3rem;
    height: 3rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
}

.btn-icon:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.field label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

.activities-list {
    background: var(--bg-card);
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.activities-list h3 {
    padding: 1.5rem 2rem;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    margin: 0;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.activities-list h3 i {
    color: var(--primary-color);
}

#activities-container {
    padding: 2rem;
}

.activity-item {
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 1rem;
    transition: all 0.2s ease;
    background: var(--bg-card);
    position: relative;
    border-left: 3px solid transparent;
}

.activity-item:hover {
    border-left-color: var(--monokai-cyan);
    box-shadow: 0 0 20px rgba(102, 217, 239, 0.1);
    background: var(--monokai-bg-dark);
    cursor: pointer;
}

.activity-text {
    font-weight: 500;
    color: var(--monokai-yellow);
    margin-bottom: 0.5rem;
    font-family: 'Fira Code', monospace;
}

.activity-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-light);
    font-size: 0.9rem;
}

.activity-time {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    color: var(--monokai-cyan);
    font-family: 'Fira Code', monospace;
    font-size: 0.85rem;
}

.empty-state {
    text-align: center;
    color: var(--text-light);
    padding: 3rem 1rem;
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    .header-content {
        padding: 1rem;
    }
    
    .input-group {
        flex-direction: column;
    }
    
    #current-time {
        font-size: 2rem;
    }
    
    .activity-header {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .activity-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
}