:root {
    /* Base Colors - Adjusted for a darker, richer canvas */
    --primary-bg: #0d1a2b; /* Very dark navy/charcoal */
    --calendar-bg: #1a2b3d; /* Slightly lighter for calendar body */
    --header-bg: #2a3d50; /* Muted steel blue for header */
    --text-color: #e0f2f7; /* Soft cyan-white text */
    --inactive-text: #6b849e; /* Muted text for inactive days */
    --border-color: #3b506b; /* Darker blue-gray border */
    --shadow-color: rgba(0, 0, 0, 0.5); /* Stronger shadows */

    /* Primary Accent - The new #00ffff focus */
    --primary-accent: #00ffff; /* Cyan - Main interactive highlight */
    --primary-accent-dark: #00ccdd; /* Darker cyan for hover states */
    --primary-glow: rgba(0, 255, 255, 0.4); /* Cyan glow effect */

    /* Secondary Accent - For contrast and secondary actions */
    --secondary-accent: #ff00ff; /* Magenta - For add event, edit buttons etc. */
    --secondary-accent-dark: #cc00cc; /* Darker magenta for hover */
    --secondary-glow: rgba(255, 0, 255, 0.4); /* Magenta glow effect */

    /* Special State Colors */
    --today-bg: #00ff80; /* Emerald Green - For "Today" */
    --today-text: #00331a; /* Dark text for today's cell */
    --event-bg: #8b5cf6; /* Lavender (keeping this for now, or can change to a blend) */
    --event-text: #f0f9ff; /* Light event text */
    --delete-btn-bg: #e53e3e; /* Red for delete */
    --delete-btn-hover: #c53030; /* Darker red */

    /* Fonts */
    --font-primary: 'Signika', sans-serif, 'Inter', sans-serif;

    /* Transitions & Effects */
    --transition-speed: 0.3s;
    --hover-scale: 1.01; /* Slightly less scale for subtle effect */
}

/* Base styles for the body */
body {
    font-family: var(--font-primary);
    background: linear-gradient(135deg, var(--primary-bg), #0f1c2c); /* Gradient background */
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    overflow: hidden; /* Hide scrollbars if not needed */
    position: relative;
    user-select: none; /* Prevent text selection */
}

/* Background gradient animation (optional, for extra uniqueness) */
body::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at top left, rgba(0, 255, 255, 0.05) 0%, transparent 40%),
                radial-gradient(circle at bottom right, rgba(255, 0, 255, 0.05) 0%, transparent 40%);
    z-index: -1;
    animation: backgroundGlow 20s infinite alternate;
}

@keyframes backgroundGlow {
    from {
        background-position: 0% 0%;
    }
    to {
        background-position: 100% 100%;
    }
}


/* Calendar Container - The main structure */
.calendar-container {
    background-color: var(--calendar-bg);
    border-radius: 18px; /* More rounded corners */
    box-shadow: 0 15px 40px var(--shadow-color), 0 0 30px var(--primary-glow); /* Deeper shadow with primary glow */
    width: 95%;
    max-width: 680px; /* Slightly larger */
    height: auto;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    border: 1px solid var(--border-color);
    animation: fadeInScale 0.8s ease-out forwards;
    position: relative; /* For pseudo-elements */
    z-index: 1; /* Ensure it's above body pseudo-elements */
}

/* Subtle inner glow for the container */
.calendar-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: 18px;
    box-shadow: inset 0 0 15px rgba(0, 255, 255, 0.15); /* Inner cyan glow */
    pointer-events: none; /* Allows clicks to pass through */
    z-index: 2;
}

@keyframes fadeInScale {
    from { opacity: 0; transform: scale(0.9); }
    to { opacity: 1; transform: scale(1); }
}

/* Calendar Header - Adjusted to be in a single line */
.calendar-header {
    display: flex;
    align-items: center; /* Vertically align items */
    justify-content: space-between; /* Distribute space between items */
    padding: 15px 20px;
    background-color: var(--header-bg);
    border-bottom: 1px solid var(--border-color);
    border-top-left-radius: 18px;
    border-top-right-radius: 18px;
    flex-wrap: nowrap; /* Prevent wrapping by default */
}

.month-year-display {
    font-size: 1.5em;
    font-weight: 600;
    color: var(--text-color);
    /* No flex-grow here to prevent it from taking too much space */
    text-align: center; /* Centered within its own available space */
    padding: 0 10px; /* Add some horizontal padding */
    white-space: nowrap; /* Prevent text from wrapping */
    min-width: 150px; /* Ensure enough space for month/year */
}

/* Buttons Container for Nav buttons */
.nav-buttons {
    display: flex;
    gap: 5px; /* Space between nav buttons */
    align-items: center;
}

/* Buttons Container for Action buttons (Today, View Toggle, Add Event) */
.action-buttons {
    display: flex;
    gap: 10px; /* Space between action buttons */
    align-items: center;
}

/* Buttons (General Styles) */
.nav-btn, .view-btn, .today-btn, .add-event-btn {
    background-color: var(--calendar-bg); /* Simple background matching calendar body */
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 6px; /* Slightly less rounded */
    padding: 8px 12px;
    cursor: pointer;
    font-size: 0.9em;
    font-weight: 500;
    transition: all var(--transition-speed) ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2); /* Simpler shadow */
    display: flex;
    align-items: center;
    gap: 5px;
    text-shadow: none;
    white-space: nowrap; /* Prevent button text from wrapping */
}

.nav-btn:hover, .view-btn:hover, .today-btn:hover {
    background-color: var(--header-bg); /* Slightly darker on hover */
    color: var(--primary-accent); /* Cyan highlight on hover */
    transform: translateY(-1px);
    box-shadow: 0 3px 6px rgba(0, 0, 0, 0.3);
    border-color: var(--primary-accent);
}

/* Specific nav button adjustments */
.nav-btn {
    font-size: 1.1em;
    padding: 6px 10px;
    background: transparent; /* Arrows remain transparent */
    border: none;
    color: var(--text-color);
}
.nav-btn:hover {
    background: transparent;
    color: var(--primary-accent);
    transform: translateY(-1px) scale(1.1);
    box-shadow: none;
}

.view-toggle {
    display: flex;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    overflow: hidden;
    /* margin: 0 10px; removed to manage spacing with gap on action-buttons*/
    box-shadow: inset 0 0 3px rgba(0, 0, 0, 0.2);
}

.view-btn {
    padding: 8px 12px;
    border-radius: 0;
    border: none;
    background-color: transparent; /* Transparent default */
    color: var(--text-color);
}

.view-btn.active {
    background-color: var(--primary-accent); /* Solid cyan for active */
    color: var(--primary-bg); /* Dark text on cyan */
    font-weight: 600;
    box-shadow: inset 0 0 5px rgba(0, 0, 0, 0.3);
}

.view-btn.active:hover {
    background-color: var(--primary-accent-dark); /* Slightly darker cyan on hover for active */
    transform: translateY(0);
    box-shadow: inset 0 0 7px rgba(0, 0, 0, 0.4);
}

.add-event-btn {
    background-color: var(--secondary-accent); /* Magenta for add event button */
    color: white;
    border-color: var(--secondary-accent);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.add-event-btn:hover {
    background-color: var(--secondary-accent-dark);
    box-shadow: 0 4px 8px rgba(255, 0, 255, 0.4);
}


/* Calendar Body - Main display area for days (NO CHANGE HERE) */
.calendar-body {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    padding: 15px;
    overflow-y: auto;
}

/* Weekdays Header */
.weekdays-header {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    text-align: center;
    padding-bottom: 10px;
    margin-bottom: 10px;
    font-weight: 600;
    color: var(--primary-accent); /* Cyan weekdays */
    border-bottom: 1px dashed var(--border-color); /* Dashed border for uniqueness */
    text-shadow: 0 0 5px rgba(0, 255, 255, 0.2);
}

.weekday {
    padding: 8px 0;
    font-size: 0.95em;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Days Grid - The actual calendar days */
.days-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 8px;
    flex-grow: 1;
}

.day-cell {
    background-color: rgba(26, 43, 61, 0.7); /* Slightly transparent background for crystal effect */
    border-radius: 10px;
    padding: 10px;
    min-height: 75px;
    display: flex;
    flex-direction: column;
    position: relative;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid transparent;
    overflow: hidden;
    backdrop-filter: blur(2px); /* Subtle blur for crystal effect */
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}

.day-cell:hover {
    background-color: rgba(0, 255, 255, 0.1); /* Cyan-tinted hover */
    box-shadow: 0 5px 15px var(--primary-glow), inset 0 0 10px var(--primary-glow); /* Intense glow on hover */
    border-color: var(--primary-accent); /* Cyan border on hover */
    transform: translateY(-2px); /* Lift on hover */
}

.day-number {
    font-size: 1.2em;
    font-weight: 600;
    margin-bottom: 5px;
    color: var(--text-color);
    text-align: right;
    padding-right: 5px;
}

.day-cell.today {
    background: linear-gradient(135deg, var(--today-bg), #00a850); /* Emerald green gradient for today */
    color: var(--today-text);
    font-weight: 700;
    box-shadow: 0 0 15px rgba(0, 255, 128, 0.8), inset 0 0 10px rgba(0, 255, 128, 0.5);
    border-color: var(--today-bg);
    transform: scale(1.02);
}

.day-cell.today .day-number {
    color: var(--today-text);
    text-shadow: none;
}

.day-cell.inactive {
    opacity: 0.4;
    cursor: default;
    background-color: rgba(26, 43, 61, 0.3);
    border: 1px solid rgba(59, 80, 107, 0.3);
}

.day-cell.inactive:hover {
    background-color: rgba(26, 43, 61, 0.3);
    box-shadow: none;
    border-color: rgba(59, 80, 107, 0.3);
    transform: translateY(0);
}

/* Week and Day View specific styles (NO CHANGE HERE) */
.week-day-cell, .full-day-cell {
    min-height: 120px;
    justify-content: flex-start;
    padding: 15px;
}

.week-day-header, .day-view-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    width: 100%;
    margin-bottom: 10px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
    color: var(--primary-accent);
    font-size: 1.1em;
    font-weight: 600;
}

.week-day-header .weekday-name, .day-view-header .weekday-name {
    font-size: 1.2em;
    text-transform: capitalize;
}

.week-day-header .day-number, .day-view-header .day-number {
    font-size: 1.5em;
    color: var(--text-color);
    font-weight: 700;
}


/* Event Styling - More Distinct (NO CHANGE HERE) */
.event {
    background-color: var(--event-bg);
    color: var(--event-text);
    border-radius: 6px;
    padding: 5px 8px;
    margin-bottom: 4px;
    font-size: 0.8em;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.event:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.4), 0 0 8px var(--event-bg);
    background-color: #a872ff;
}

/* Event List inside day cell (NO CHANGE HERE) */
.events-list {
    flex-grow: 1;
    overflow-y: auto;
    padding-right: 5px;
}

/* Scrollbar for event list (NO CHANGE HERE) */
.events-list::-webkit-scrollbar {
    width: 4px;
}

.events-list::-webkit-scrollbar-track {
    background: transparent;
}

.events-list::-webkit-scrollbar-thumb {
    background-color: var(--border-color);
    border-radius: 4px;
}
.events-list::-webkit-scrollbar-thumb:hover {
    background-color: var(--primary-accent);
}


/* Modal Styles (General for both add & details) (NO CHANGE HERE) */
.modal {
    position: fixed;
    z-index: 100;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    display: none;
    justify-content: center;
    align-items: center;
    animation: modalFadeIn 0.3s ease-out forwards;
}

@keyframes modalFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background-color: var(--calendar-bg);
    margin: 20px;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 30px var(--shadow-color), 0 0 25px var(--primary-glow);
    width: 90%;
    max-width: 450px;
    position: relative;
    border: 2px solid var(--primary-accent);
    animation: modalPopIn 0.4s cubic-bezier(0.68, -0.55, 0.27, 1.55) forwards;
}

@keyframes modalPopIn {
    from { transform: scale(0.8); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

.close-button {
    color: var(--text-color);
    font-size: 30px;
    font-weight: bold;
    position: absolute;
    top: 15px;
    right: 20px;
    cursor: pointer;
    transition: color 0.2s ease, transform 0.2s ease;
    opacity: 0.7;
}

.close-button:hover,
.close-button:focus {
    color: var(--primary-accent);
    transform: scale(1.2);
    opacity: 1;
}

.modal-content h3 {
    color: var(--primary-accent);
    margin-top: 0;
    margin-bottom: 20px;
    text-align: center;
    font-size: 1.8em;
    font-weight: 700;
    border-bottom: 1px dashed var(--border-color);
    padding-bottom: 10px;
    text-shadow: 0 0 5px var(--primary-glow);
}

.modal-content form label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-color);
    font-weight: 500;
    font-size: 1em;
}

.modal-content form input,
.modal-content form textarea {
    width: calc(100% - 20px);
    padding: 10px;
    margin-bottom: 15px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--primary-bg);
    color: var(--text-color);
    font-size: 1em;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.modal-content form input:focus,
.modal-content form textarea:focus {
    border-color: var(--primary-accent);
    box-shadow: 0 0 0 3px var(--primary-glow);
    outline: none;
}

.modal-content form button {
    width: 100%;
    padding: 12px 15px;
    background: linear-gradient(45deg, var(--primary-accent), var(--primary-accent-dark));
    color: var(--primary-bg); /* Dark text on cyan for submit */
    border: none;
    border-radius: 8px;
    font-size: 1.1em;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
    box-shadow: 0 3px 8px var(--primary-glow);
    text-shadow: 0 0 3px rgba(0, 0, 0, 0.3);
}

.modal-content form button:hover {
    background: linear-gradient(45deg, var(--primary-accent-dark), var(--primary-accent));
    transform: translateY(-2px);
    box-shadow: 0 5px 15px var(--primary-glow);
}

/* Event Details Modal Specific Styles (NO CHANGE HERE) */
#eventDetailsModal .modal-content {
    max-width: 450px;
    padding: 35px;
    background-color: var(--calendar-bg);
    border: 3px solid var(--secondary-accent);
    box-shadow: 0 15px 40px var(--shadow-color), 0 0 35px var(--secondary-glow);
}

#eventDetailsModal h3 {
    color: var(--secondary-accent);
    text-align: center;
    margin-bottom: 25px;
    font-size: 2em;
    font-weight: 700;
    border-bottom: 2px solid var(--secondary-accent);
    padding-bottom: 15px;
    text-transform: uppercase;
    letter-spacing: 1px;
    text-shadow: 0 0 8px var(--secondary-glow);
}

.details-info-row {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 15px;
    margin-bottom: 18px;
    align-items: flex-start;
    background-color: rgba(0, 0, 0, 0.1);
    padding: 10px;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.details-info-row i {
    color: var(--primary-accent);
    font-size: 1.3em;
    width: 25px;
    text-align: center;
    line-height: 1.2;
    text-shadow: 0 0 5px var(--primary-glow);
}

.details-info-row span {
    color: var(--text-color);
    font-size: 1.05em;
    font-weight: 400;
    line-height: 1.5;
}

#eventDetailsModal #detailsDescription {
    white-space: pre-wrap;
    max-height: 180px;
    overflow-y: auto;
    background-color: var(--primary-bg);
    padding: 15px;
    border-radius: 10px;
    border: 2px solid var(--border-color);
    margin-top: 20px;
    display: block;
    font-size: 0.95em;
    color: var(--text-color);
    box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.2);
}

.modal-actions {
    display: flex;
    justify-content: center;
    margin-top: 35px;
    gap: 20px;
}

.modal-action-btn {
    padding: 14px 25px;
    border-radius: 10px;
    font-size: 1.05em;
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    border: none;
}

#editEventBtn {
    background: linear-gradient(45deg, var(--today-bg), #00bb66);
    color: var(--today-text);
    text-shadow: 0 0 3px rgba(0, 0, 0, 0.3);
}

#editEventBtn:hover {
    background: linear-gradient(45deg, #00bb66, var(--today-bg));
    transform: translateY(-3px);
    box-shadow: 0 6px 18px rgba(0, 255, 128, 0.6);
}

#deleteEventBtn {
    background: linear-gradient(45deg, var(--delete-btn-bg), var(--delete-btn-hover));
    color: white;
    text-shadow: 0 0 3px rgba(0, 0, 0, 0.3);
}

#deleteEventBtn:hover {
    background: linear-gradient(45deg, var(--delete-btn-hover), var(--delete-btn-bg));
    transform: translateY(-3px);
    box-shadow: 0 6px 18px rgba(229, 62, 62, 0.6);
}

/* Scrollbar - Subtle & themed (NO CHANGE HERE) */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--primary-bg);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb {
    background-color: var(--border-color);
    border-radius: 10px;
    border: 2px solid var(--primary-bg);
}

::-webkit-scrollbar-thumb:hover {
    background-color: var(--primary-accent);
    border-color: var(--primary-accent-dark);
}

/* Responsive adjustments for smaller screens */
@media (max-width: 768px) {
    .calendar-container {
        max-width: 95%;
        margin: 10px;
    }
    .calendar-header {
        /* Allow wrapping on very small screens if necessary, but try to keep things compact */
        flex-wrap: wrap; 
        justify-content: center;
        gap: 10px; /* Space between wrapped items */
        padding: 15px;
    }
    .month-year-display {
        font-size: 1.3em; /* Slightly smaller for mobile */
        width: 100%; /* Take full width on small screens for better centering */
        margin-bottom: 5px; /* Add some space below */
        order: 1; /* Make it appear first */
    }
    .nav-buttons {
        order: 2; /* Nav buttons second */
        justify-content: center; /* Center them */
        width: 100%;
    }
    .action-buttons {
        order: 3; /* Action buttons third */
        justify-content: center; /* Center them */
        width: 100%;
        flex-wrap: wrap; /* Allow these buttons to wrap too */
    }
    .nav-btn, .today-btn, .add-event-btn {
        font-size: 0.8em;
        padding: 7px 10px;
    }
    .view-toggle {
        margin: 0;
        /* width: 100%; removed to let flex manage it */
        flex: 1; /* Allow it to take available space */
    }
    .view-btn {
        flex: 1; /* Distribute evenly */
        font-size: 0.75em;
        padding: 7px 8px;
    }
    .weekdays-header {
        font-size: 0.8em;
    }
    .day-cell {
        min-height: 60px;
        padding: 8px;
    }
    .day-number {
        font-size: 1em;
    }
    .event {
        font-size: 0.7em;
        padding: 3px 5px;
    }
    .modal-content {
        padding: 20px;
        max-width: 90%;
    }
    .modal-content h3 {
        font-size: 1.5em;
    }
    .modal-content form input,
    .modal-content form textarea,
    .modal-content form button {
        font-size: 0.9em;
        padding: 8px;
    }
    #eventDetailsModal .modal-content {
        padding: 25px;
    }
    #eventDetailsModal h3 {
        font-size: 1.6em;
    }
    .details-info-row {
        gap: 10px;
        margin-bottom: 12px;
    }
    .details-info-row i {
        font-size: 1.1em;
    }
    .details-info-row span {
        font-size: 0.9em;
    }
    .modal-actions {
        flex-direction: column; /* Stack buttons on small screens */
        gap: 10px;
    }
    .modal-action-btn {
        width: 100%;
        padding: 10px;
    }
}

/* For animating content when view changes (e.g., month to week) */
.days-grid {
    /* Existing styles */
    transition: opacity 0.2s ease-in-out, transform 0.2s ease-in-out;
}

.fade-out-content {
    opacity: 0;
    transform: scale(0.98); /* Slightly shrink as it fades out */
}

.fade-in-content {
    opacity: 1;
    transform: scale(1); /* Return to normal size */
    /* No transition duration here, as it's handled by the base .days-grid */
}

/* For modal transitions */
.modal {
    /* Existing styles (background-color, backdrop-filter, display: none etc.) */
    opacity: 0;
    transform: scale(0.9);
    transition: opacity 0.3s ease-out, transform 0.3s cubic-bezier(0.68, -0.55, 0.27, 1.55); /* Add transform for pop-in */
    pointer-events: none; /* Prevent clicks when hidden */
}

.modal.modal-active {
    opacity: 1;
    transform: scale(1);
    pointer-events: auto; /* Allow clicks when active */
}

/* For Today button highlight */
.today-highlight {
    animation: todayBtnHighlight 0.5s ease-out forwards;
}

@keyframes todayBtnHighlight {
    0% {
        box-shadow: 0 0 10px var(--today-bg);
        border-color: var(--today-bg);
        transform: scale(1.05);
    }
    50% {
        box-shadow: 0 0 20px var(--today-bg);
        border-color: var(--today-bg);
        transform: scale(1);
    }
    100% {
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2); /* Revert to original shadow */
        border-color: var(--border-color); /* Revert to original border */
        transform: scale(1);
    }
}