:root {
    --primary-color: #ff6b81;
    --secondary-color: #ff4757;
    --text-color: #333;
    --bg-color: #fff;
    --card-bg: #f8f9fa;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

.dark-mode {
    --primary-color: #e84393;
    --secondary-color: #fd79a8;
    --text-color: #f1f1f1;
    --bg-color: #1e272e;
    --card-bg: #2d3436;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

.nature-mode {
    --primary-color: #00b894;
    --secondary-color: #55efc4;
    --text-color: #2d3436;
    --bg-color: #f5f6fa;
    --card-bg: #dfe6e9;
    --period-color: #ff4d4d;
    --fertile-color: #4caf50;
    --ovulation-color: #ffeb3b;
    --diagram-bg: #eee;
    --diagram-stroke: #e0e0e0;
    --diagram-label-color: #666;
    --tooltip-bg: #333;
    --tooltip-text: #fff;
    --today-marker-fill: #333;
    --today-marker-stroke: #fff;
}

.professional-mode {
    --primary-color: #0984e3;
    --secondary-color: #74b9ff;
    --text-color: #2d3436;
    --bg-color: #f5f6fa;
    --card-bg: #dfe6e9;
    --period-color: #ff4d4d;
    --fertile-color: #4caf50;
    --ovulation-color: #ffeb3b;
    --diagram-bg: #eee;
    --diagram-stroke: #e0e0e0;
    --diagram-label-color: #666;
    --tooltip-bg: #333;
    --tooltip-text: #fff;
    --today-marker-fill: #333;
    --today-marker-stroke: #fff;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: var(--transition);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    margin-bottom: 30px;
}

.logo {
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-color);
}

.settings {
    display: flex;
    align-items: center;
    gap: 15px;
}

.theme-selector,
.language-selector {
    padding: 8px 12px;
    border-radius: 20px;
    border: 1px solid #ddd;
    background-color: var(--card-bg);
    color: var(--text-color);
    cursor: pointer;
}

.main-title {
    text-align: center;
    margin-bottom: 30px;
    color: var(--primary-color);
}

.dashboard {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 30px;
}

@media (max-width: 768px) {
    .dashboard {
        grid-template-columns: 1fr;
    }
}

.card {
    background-color: var(--card-bg);
    border-radius: 10px;
    padding: 20px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-5px);
}

.card-title {
    font-size: 18px;
    margin-bottom: 15px;
    color: var(--primary-color);
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 5px;
}

.input-group {
    margin-bottom: 15px;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
}

input,
select,
textarea {
    width: 100%;
    padding: 10px;
    border-radius: 5px;
    border: 1px solid #ddd;
    background-color: var(--bg-color);
    color: var(--text-color);
}

button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    transition: var(--transition);
    font-weight: bold;
}

button:hover {
    background-color: var(--secondary-color);
    transform: translateY(-2px);
}

.secondary-btn {
    background-color: #6c757d;
    margin-top: 10px;
}

.secondary-btn:hover {
    background-color: #5a6268;
}

.result {
    margin-top: 20px;
    padding: 15px;
    background-color: rgba(0, 0, 0, 0.05);
    border-radius: 5px;
    border-right: 4px solid var(--primary-color);
}

.result-title {
    font-weight: bold;
    margin-bottom: 10px;
}

.info-section {
    margin-top: 40px;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.info-card {
    background-color: var(--card-bg);
    border-radius: 10px;
    padding: 20px;
    box-shadow: var(--shadow);
}

.tab-container {
    margin-top: 20px;
}

.tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    border-bottom: 2px solid var(--primary-color);
}

.tab {
    padding: 10px 20px;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: var(--transition);
}

.tab.active {
    border-bottom-color: var(--primary-color);
    color: var(--primary-color);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.hidden {
    display: none;
}

.language-content {
    display: none;
}

.language-content.active {
    display: block;
}

.save-notification {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: var(--primary-color);
    color: white;
    padding: 15px 30px;
    border-radius: 20px;
    box-shadow: var(--shadow);
    z-index: 1000;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.save-notification.show {
    opacity: 1;
    transform: translateY(0);
}

@keyframes pulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
    100% {
        transform: scale(1);
    }
}

.calendar {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 5px;
    margin-top: 15px;
}

.calendar-header {
    font-weight: bold;
    text-align: center;
    padding: 5px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 3px;
}

.calendar-day {
    padding: 10px;
    text-align: center;
    border-radius: 3px;
    background-color: rgba(0, 0, 0, 0.05);
}

.period-day {
    background-color: var(--primary-color);
    color: white;
    font-weight: bold;
}

.fertile-day {
    background-color: var(--secondary-color);
    color: white;
    font-weight: bold;
}

.ovulation-day {
    background-color: #00b894;
    color: white;
    font-weight: bold;
}

.next-period {
    animation: pulse 2s infinite;
}

.stats {
    display: flex;
    justify-content: space-around;
    margin-top: 20px;
    flex-wrap: wrap;
    gap: 10px;
}

.stat-item {
    text-align: center;
    padding: 10px;
    background-color: rgba(0, 0, 0, 0.05);
    border-radius: 5px;
    min-width: 100px;
}

.stat-value {
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-color);
}

.stat-label {
    font-size: 12px;
    color: var(--text-color);
    opacity: 0.8;
}

.progress-container {
    width: 100%;
    background-color: #f1f1f1;
    border-radius: 5px;
    margin: 10px 0;
}

.progress-bar {
    height: 20px;
    border-radius: 5px;
    background-color: var(--primary-color);
    text-align: center;
    color: white;
    line-height: 20px;
    font-size: 12px;
}

.symptoms-list {
    list-style-type: none;
}

.symptoms-list li {
    padding: 8px 0;
    border-bottom: 1px dashed #ddd;
}

.symptom-logging-area {
    background-color: var(--card-bg-color);
    padding: 20px;
    border-radius: 8px;
    margin-top: 20px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.symptom-checklist h5, .mood-tracker h5 {
    margin-bottom: 10px;
    color: var(--primary-color);
}

.symptom-checklist label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-color);
}

.mood-tracker select {
    width: 100%;
    padding: 8px;
    border-radius: 4px;
    border: 1px solid #ccc;
    margin-top: 5px;
}

.cycle-visualization-container, .cycle-circle-container, .circle-diagram-with-legend {
    margin-top: 20px;
    padding: 10px;
    background: var(--container-bg);
    border-radius: 8px;
}

.timeline {
    position: relative;
    width: 100%;
    height: 20px;
    background-color: var(--diagram-bg);
    border-radius: 10px;
    margin: 20px 0 10px;
}

.phase {
    position: absolute;
    height: 100%;
    top: 0;
    border-radius: 10px;
    transition: width 0.3s, left 0.3s;
    cursor: pointer;
}

.phase::after {
    content: attr(data-label);
    position: absolute;
    bottom: 120%;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--tooltip-bg);
    color: var(--tooltip-text);
    padding: 5px 10px;
    border-radius: 5px;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s;
    font-size: 12px;
}

.phase:hover::after {
    opacity: 1;
    visibility: visible;
}

.period-phase { background-color: var(--period-color); z-index: 4; }
.follicular-phase { background-color: #a2d2ff; z-index: 1; }
.fertile-window { background-color: var(--fertile-color); z-index: 2; }
.ovulation-day { background-color: var(--ovulation-color); width: 4px; transform: translateX(-2px); z-index: 3; }
.luteal-phase { background-color: #ffc09f; z-index: 1; }

.timeline-labels {
    display: flex;
    justify-content: space-between;
    font-size: 12px;
    color: var(--diagram-label-color);
}

.circle-diagram-with-legend {
    display: flex;
    align-items: center;
    gap: 20px;
}

.circle-diagram-svg-container {
    position: relative;
    width: 150px;
    height: 150px;
}

.cycle-bg {
    fill: var(--diagram-bg);
    stroke: var(--diagram-stroke);
    stroke-width: 1;
}

.viz-period-svg { fill: var(--period-color); }
.viz-fertile-svg { fill: var(--fertile-color); }
.viz-ovulation-svg { fill: var(--ovulation-color); }

.today-marker {
    fill: var(--today-marker-fill);
    stroke: var(--today-marker-stroke);
    stroke-width: 2;
}

.diagram-legend {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.legend-item {
    display: flex;
    align-items: center;
    font-size: 14px;
    color: var(--text-color);
}

.legend-color {
    width: 15px;
    height: 15px;
    border-radius: 50%;
    margin-right: 8px;
}

.legend-color.period { background-color: var(--period-color); }
.legend-color.fertile { background-color: var(--fertile-color); }
.legend-color.ovulation { background-color: var(--ovulation-color); }

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }

    h1 {
        font-size: 1.8em;
    }

    .circle-diagram-with-legend {
        flex-direction: column;
        align-items: center;
    }

    .form-container,
    .history-container,
    .symptoms-container,
    .notifications-container,
    .settings-container,
    .visualization-container {
        padding: 15px;
    }

    .symptoms-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    }
}

@media (max-width: 480px) {
    body {
        font-size: 14px;
    }

    .container {
        padding: 10px;
    }

    h1 {
        font-size: 1.5em;
    }

    h2 {
        font-size: 1.2em;
    }

    .input-group {
        flex-direction: column;
        align-items: flex-start;
    }

    .input-group label {
        margin-bottom: 5px;
    }

    button {
        width: 100%;
        padding: 12px;
    }

    .symptoms-grid {
        grid-template-columns: 1fr 1fr;
    }

    .header {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .theme-selector, .language-selector {
        align-self: flex-start;
    }
}

.viz-labels {
    display: flex;
    justify-content: space-around;
    margin-top: 10px;
    font-size: 12px;
}

.viz-label {
    display: flex;
    align-items: center;
}

.viz-label span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    margin-right: 5px;
}

.day-marker {
    position: absolute;
    top: -20px;
    transform: translateX(-50%);
    font-size: 10px;
    color: #666;
}

.cycle-circle-container {
    margin-top: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.circle-diagram-svg-container {
    position: relative;
    width: 150px;
    height: 150px;
}

.circle-diagram-svg-container svg {
    width: 100%;
    height: 100%;
}

.viz-period-svg {
    fill: var(--primary-color);
    cursor: pointer;
}

.viz-fertile-svg {
    fill: var(--secondary-color);
    cursor: pointer;
}

.viz-ovulation-svg {
    fill: #00b894;
    cursor: pointer;
}

.circle-inner {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 120px;
    height: 120px;
    background: #fff;
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    pointer-events: none; /* Allows hover events to pass through to the SVG */
}

.circle-day {
    font-size: 2em;
    font-weight: bold;
}

.circle-label {
    font-size: 0.9em;
    color: #666;
}

@media (max-width: 480px) {
    .container {
        padding: 10px;
    }

    .dashboard {
        grid-template-columns: 1fr;
    }

    .card {
        padding: 15px;
    }

    .tab-container {
        margin-top: 15px;
    }

    .save-notification {
        bottom: 10px;
        right: 10px;
        padding: 10px 20px;
    }
}