:root {
    --primary: #ff5e94;
    --primary-light: #ff9ab9;
    --secondary: #9c4dcc;
    --background: #fff5f9;
    --card-bg: #ffffff;
    --text: #333333;
    --text-light: #666666;
    --success: #4caf50;
    --warning: #ff9800;
    --danger: #f44336;
    --cycle: #d7aefb;
    --fertile: #f8bbd0;
    --ovulation: #f48fb1;
    --period: #ff5e94;
    --symptom: #4fc3f7;
    --card-shadow: 0 6px 16px rgba(0,0,0,0.08);

    /* Dark mode variables */
    --dark-bg: #121212;
    --dark-card: #1e1e1e;
    --dark-text: #e0e0e0;
    --dark-text-light: #9e9e9e;
}

/* Dark mode */
body.dark-mode {
    --background: var(--dark-bg);
    --card-bg: var(--dark-card);
    --text: var(--dark-text);
    --text-light: var(--dark-text-light);
    --card-shadow: 0 6px 16px rgba(0,0,0,0.2);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    transition: background-color 0.3s, color 0.3s, border-color 0.3s;
}

body {
    background-color: var(--background);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    padding-bottom: 60px;
}

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

/* Setup Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.85);
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background-color: var(--card-bg);
    border-radius: 20px;
    width: 90%;
    max-width: 500px;
    padding: 40px;
    box-shadow: var(--card-shadow);
    position: relative;
    max-height: 90vh;
    overflow-y: auto;
    transform: translateY(30px);
    transition: transform 0.4s ease;
}

.modal-overlay.active .modal-content {
    transform: translateY(0);
}

.modal-title {
    font-size: 1.8rem;
    color: var(--primary);
    margin-bottom: 25px;
    text-align: center;
}

.modal-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-weight: 600;
    color: var(--text);
}

.form-group input, .form-group select {
    padding: 12px 15px;
    border-radius: 12px;
    border: 1px solid #ddd;
    background-color: var(--card-bg);
    color: var(--text);
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input:focus, .form-group select:focus {
    outline: none;
    border-color: var(--primary);
}

.modal-btn {
    padding: 14px;
    border-radius: 50px;
    border: none;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    background-color: var(--primary);
    color: white;
    font-size: 1.1rem;
    margin-top: 10px;
}

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

/* Header Styles */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    margin-bottom: 20px;
    border-bottom: 2px solid var(--primary-light);
}

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

.logo i {
    font-size: 2.5rem;
    color: var(--primary);
}

.logo h1 {
    font-size: 2.2rem;
    color: var(--primary);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

.btn {
    padding: 10px 20px;
    border-radius: 50px;
    border: none;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    box-shadow: 0 4px 8px rgba(156, 77, 204, 0.2);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(156, 77, 204, 0.3);
}

.dark-mode-toggle {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.dark-mode-toggle:hover {
    background-color: rgba(0,0,0,0.05);
    transform: rotate(15deg);
}

/* Cards */
.card {
    background-color: var(--card-bg);
    border-radius: 20px;
    padding: 25px;
    box-shadow: var(--card-shadow);
    margin-bottom: 30px;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.card-title {
    font-size: 1.4rem;
    color: var(--primary);
    font-weight: 600;
}

/* Main Dashboard */
.dashboard-overview {
    display: grid;
    grid-template-columns: 1fr;
    gap: 25px;
    margin-bottom: 30px;
}

.welcome-card {
    background: linear-gradient(135deg, rgba(255, 94, 148, 0.1), rgba(156, 77, 204, 0.1));
    border-radius: 20px;
    padding: 25px;
    display: flex;
    align-items: center;
    gap: 20px;
    border: 1px solid rgba(255, 94, 148, 0.2);
}

.welcome-icon {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2rem;
    color: white;
    flex-shrink: 0;
}

.welcome-text h2 {
    font-size: 1.8rem;
    margin-bottom: 5px;
    color: var(--primary);
}

.welcome-text p {
    color: var(--text-light);
}

.cycle-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
    margin-bottom: 30px;
}

.cycle-card {
    background-color: var(--card-bg);
    border-radius: 20px;
    padding: 25px;
    display: flex;
    flex-direction: column;
    gap: 15px;
    border: 1px solid rgba(0,0,0,0.05);
}

.cycle-card-header {
    display: flex;
    align-items: center;
    gap: 15px;
}

.cycle-card-icon {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.cycle-card-icon.period {
    background-color: var(--period);
    color: white;
}

.cycle-card-icon.fertile {
    background-color: var(--fertile);
}

.cycle-card-icon.ovulation {
    background-color: var(--ovulation);
    color: white;
}

.cycle-card-content h3 {
    font-size: 1.2rem;
    margin-bottom: 5px;
}

.cycle-card-content p {
    color: var(--text-light);
    font-size: 0.95rem;
}

.cycle-card-content .value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary);
    margin-top: 10px;
}

.cycle-progress {
    height: 8px;
    background-color: rgba(0,0,0,0.05);
    border-radius: 4px;
    overflow: hidden;
    margin-top: 10px;
}

.cycle-progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: 4px;
}

/* Stats Section */
.stats-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 16px;
    padding: 20px;
    color: white;
    box-shadow: 0 6px 12px rgba(0,0,0,0.1);
}

.stat-title {
    font-size: 1rem;
    margin-bottom: 10px;
    opacity: 0.9;
}

.stat-value {
    font-size: 2.2rem;
    font-weight: 700;
}

.stat-unit {
    font-size: 1rem;
    margin-left: 5px;
    opacity: 0.8;
}

/* Charts Container */
.charts {
    display: grid;
    grid-template-columns: 1fr;
    gap: 25px;
    margin-bottom: 30px;
}

.chart-container {
    height: 300px;
    position: relative;
}

/* Symptoms Section */
.symptoms-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 15px;
    margin-top: 15px;
}

.symptom-item {
    background-color: rgba(79, 195, 247, 0.1);
    border-radius: 12px;
    padding: 15px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

body.dark-mode .symptom-item {
    background-color: rgba(79, 195, 247, 0.15);
}

.symptom-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.08);
}

.symptom-item.selected {
    background-color: var(--symptom);
    color: white;
    border-color: var(--symptom);
}

.symptom-icon {
    font-size: 1.8rem;
    margin-bottom: 10px;
    color: var(--symptom);
}

.symptom-item.selected .symptom-icon {
    color: white;
}

/* Calendar Section */
.calendar-section {
    background-color: var(--card-bg);
    border-radius: 20px;
    padding: 25px;
    box-shadow: var(--card-shadow);
    margin-bottom: 30px;
}

.calendar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid rgba(0,0,0,0.1);
}

.calendar-title {
    font-size: 1.4rem;
    color: var(--primary);
    font-weight: 600;
}

.calendar-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

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

.month-nav button {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-light);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.month-nav button:hover {
    background-color: rgba(0,0,0,0.05);
    color: var(--primary);
}

.current-month {
    font-size: 1.3rem;
    font-weight: 600;
    min-width: 150px;
    text-align: center;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 8px;
}

.day-header {
    text-align: center;
    padding: 10px 0;
    font-weight: 600;
    color: var(--secondary);
}

.calendar-day {
    aspect-ratio: 1/1;
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    font-weight: 500;
    background-color: rgba(0,0,0,0.03);
    border: 1px solid transparent;
}

body.dark-mode .calendar-day {
    background-color: rgba(255,255,255,0.03);
}

.calendar-day:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    border-color: rgba(255, 94, 148, 0.3);
}

.calendar-day.today {
    border: 2px solid var(--primary);
}

.calendar-day.period {
    background-color: var(--period);
    color: white;
}

.calendar-day.fertile {
    background-color: var(--fertile);
}

.calendar-day.ovulation {
    background-color: var(--ovulation);
    color: white;
}

.calendar-day.predicted {
    background-color: var(--primary-light);
}

.calendar-day.empty {
    background-color: transparent;
    box-shadow: none;
    cursor: default;
    border: none;
}

.calendar-day.empty:hover {
    transform: none;
    box-shadow: none;
}

/* Info Button */
.info-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.8rem;
    cursor: pointer;
    box-shadow: 0 6px 12px rgba(0,0,0,0.15);
    z-index: 100;
    transition: all 0.3s ease;
}

.info-btn:hover {
    transform: scale(1.1) rotate(15deg);
    box-shadow: 0 8px 16px rgba(0,0,0,0.2);
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    padding: 15px 25px;
    border-radius: 50px;
    box-shadow: 0 6px 16px rgba(0,0,0,0.2);
    z-index: 200;
    display: flex;
    align-items: center;
    gap: 10px;
    opacity: 0;
    transition: all 0.4s ease;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* Responsive Design */
@media (max-width: 900px) {
    .cycle-summary {
        grid-template-columns: 1fr;
    }

    .stats-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 600px) {
    .calendar-day {
        font-size: 0.9rem;
    }

    .symptoms-grid {
        grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
    }

    .logo h1 {
        font-size: 1.8rem;
    }

    .welcome-card {
        flex-direction: column;
        text-align: center;
    }

    .nav-controls {
        flex-wrap: wrap;
        justify-content: flex-end;
    }

    .btn {
        padding: 8px 15px;
        font-size: 0.9rem;
    }

    .calendar-controls {
        flex-direction: column;
        gap: 15px;
        align-items: flex-start;
    }
}

@media (max-width: 480px) {
    .modal-content {
        padding: 25px 20px;
    }

    .modal-title {
        font-size: 1.5rem;
    }

    .stat-card {
        padding: 15px;
    }

    .stat-value {
        font-size: 1.8rem;
    }
}