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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f8f9fa;
    color: #333;
    line-height: 1.6;
}

.app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.app-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.app-header h1 {
    margin: 0;
    font-size: 1.8rem;
}

.app-header nav {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.app-header nav a {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: background-color 0.2s;
}

.app-header nav a:hover {
    background-color: rgba(255,255,255,0.2);
}

.app-main {
    flex: 1;
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

/* Authentication Forms */
.login-container, .register-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 60vh;
}

.login-form, .register-form {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 400px;
}

.login-form h2, .register-form h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: #333;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: #555;
}

.form-group input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
    transition: border-color 0.2s;
}

.form-group input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.2);
}

.form-group input:disabled {
    background-color: #f5f5f5;
    cursor: not-allowed;
}

.login-button, .register-button {
    width: 100%;
    padding: 0.75rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.login-button:hover, .register-button:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

.login-button:disabled, .register-button:disabled {
    background: #ccc;
    transform: none;
    cursor: not-allowed;
}

.error-message {
    background-color: #f8d7da;
    color: #721c24;
    padding: 0.75rem;
    border-radius: 4px;
    margin-bottom: 1rem;
    border: 1px solid #f5c6cb;
}

.auth-links {
    text-align: center;
    margin-top: 2rem;
    color: #666;
}

.auth-links a {
    color: #667eea;
    text-decoration: none;
}

.auth-links a:hover {
    text-decoration: underline;
}

.logout-button {
    background: rgba(255,255,255,0.2);
    border: 1px solid rgba(255,255,255,0.3);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.2s;
}

.logout-button:hover {
    background: rgba(255,255,255,0.3);
}

/* Calendar View */
.calendar-view {
    height: calc(100vh - 140px); /* Full height minus header and padding */
    display: flex;
    flex-direction: column;
}

.calendar-loading, .calendar-error {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.1);
}

.calendar-loading p {
    font-size: 1.2rem;
    color: #666;
}

.calendar-error p {
    font-size: 1.2rem;
    color: #d32f2f;
}

/* Calendar Component */
.calendar {
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.1);
    overflow: hidden;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.calendar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.5rem 2rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.month-year {
    font-size: 1.8rem;
    font-weight: 600;
    margin: 0;
}

.nav-button {
    background: rgba(255,255,255,0.2);
    border: none;
    color: white;
    font-size: 1.5rem;
    font-weight: bold;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s;
}

.nav-button:hover {
    background: rgba(255,255,255,0.3);
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    flex: 1;
    background: white;
}

.weekday-header {
    background: #f8f9fa;
    padding: 1rem;
    text-align: center;
    font-weight: 600;
    color: #666;
    border-bottom: 1px solid #e9ecef;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.calendar-day {
    border: 1px solid #f0f0f0;
    padding: 0.75rem;
    min-height: 100px;
    display: flex;
    flex-direction: column;
    cursor: pointer;
    transition: background-color 0.2s;
    position: relative;
}

.calendar-day:hover {
    background-color: #f8f9ff;
}

.calendar-day.current-month {
    background: white;
}

.calendar-day.prev-month,
.calendar-day.next-month {
    background: #fafafa;
    color: #ccc;
}

.calendar-day.today {
    background: #e3f2fd;
    border: 2px solid #2196f3;
}

.calendar-day.has-events {
    background: #fff3e0;
}

.calendar-day.today.has-events {
    background: #e1f5fe;
}

.calendar-day.selected {
    background: #e8f5e8;
    border: 2px solid #4caf50;
    box-shadow: 0 0 8px rgba(76, 175, 80, 0.3);
}

.calendar-day.selected.has-events {
    background: #f1f8e9;
}

.calendar-day.selected.today {
    background: #e0f2f1;
    border: 2px solid #4caf50;
}

.calendar-day.selected .day-number {
    color: #2e7d32;
    font-weight: 700;
}

.day-number {
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.calendar-day.today .day-number {
    color: #1976d2;
}

.event-indicators {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.event-box {
    background: #2196f3;
    color: white;
    padding: 2px 4px;
    border-radius: 3px;
    font-size: 0.7rem;
    line-height: 1.2;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    cursor: pointer;
    transition: background-color 0.2s;
}

.event-box:hover {
    background: #1976d2;
}

.event-box.refreshing {
    background: #ff9800;
    animation: pulse 1.5s ease-in-out infinite alternate;
}

@keyframes pulse {
    0% {
        opacity: 0.7;
    }
    100% {
        opacity: 1;
    }
}

.event-dot {
    background: #ff9800;
    height: 6px;
    border-radius: 3px;
    margin-bottom: 1px;
}

.more-events {
    font-size: 0.7rem;
    color: #666;
    margin-top: 2px;
    font-weight: 500;
}

/* Event Modal Styles */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(2px);
}

.modal-content {
    background: white;
    border-radius: 12px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
    animation: modalAppear 0.2s ease-out;
}

@keyframes modalAppear {
    from {
        opacity: 0;
        transform: scale(0.9) translateY(-20px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.5rem 2rem 1rem;
    border-bottom: 1px solid #e9ecef;
}

.modal-header h3 {
    margin: 0;
    color: #333;
    font-size: 1.4rem;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.8rem;
    color: #999;
    cursor: pointer;
    padding: 0;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    line-height: 1;
}

.modal-close:hover {
    background: #f8f9fa;
    color: #666;
    transform: scale(1.1);
}

.modal-body {
    padding: 1.5rem 2rem 2rem;
}

.event-detail {
    display: grid;
    grid-template-columns: 100px 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
    align-items: start;
}

.event-detail strong {
    color: #555;
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.event-detail span {
    color: #333;
    font-size: 1rem;
    line-height: 1.5;
    word-break: break-word;
}

/* Responsive Design */
@media (max-width: 768px) {
    .calendar-header {
        padding: 1rem;
    }

    .month-year {
        font-size: 1.4rem;
    }

    .nav-button {
        width: 35px;
        height: 35px;
        font-size: 1.2rem;
    }

    .weekday-header {
        padding: 0.5rem;
        font-size: 0.8rem;
    }

    .calendar-day {
        min-height: 70px;
        padding: 0.5rem;
    }

    .day-number {
        font-size: 1rem;
    }

    .app-main {
        padding: 1rem;
    }

    .calendar-view {
        height: calc(100vh - 120px);
    }
}

@media (max-width: 480px) {
    .calendar-day {
        min-height: 60px;
        padding: 0.25rem;
    }

    .weekday-header {
        padding: 0.5rem 0.25rem;
    }

    .day-number {
        font-size: 0.9rem;
    }
}

/* Mobile adjustments for modal */
@media (max-width: 768px) {
    .modal-content {
        margin: 1rem;
        width: calc(100% - 2rem);
    }

    .modal-header, .modal-body {
        padding: 1rem 1.5rem;
    }

    .event-detail {
        grid-template-columns: 80px 1fr;
        gap: 0.75rem;
        margin-bottom: 0.75rem;
    }

    .event-detail strong {
        font-size: 0.8rem;
    }

    .event-detail span {
        font-size: 0.9rem;
    }

    .app-header {
        flex-direction: column;
        text-align: center;
        padding: 1rem;
    }

    .app-header nav {
        margin-top: 1rem;
    }

    .app-main {
        padding: 1rem;
    }

    .login-form, .register-form {
        padding: 1.5rem;
    }
}