<style>
* {margin: 0; padding: 0; box-sizing: border-box;}

:root {
            --primary: #8A2BE2;
            --primary-light: #9370DB;
            --primary-dark: #6A0DAD;
            --accent: #DA70D6;
            --light: #F8F0FF;
            --dark: #2C1838;
            --text: #333333;
            --white: #FFFFFF;}

body {font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; background: linear-gradient(135deg, var(--light) 0%, #E6D5F0 100%); color: var(--text); line-height: 1.4; }
.container {max-width: 1200px; margin: 0 auto; padding: 10px;}
header {text-align: center; margin-bottom: 10px; padding: 10px;}
h1 {color: var(--primary-dark);  font-size: 2.5rem; margin-bottom: 10px; text-shadow: 2px 2px 4px rgba(0,0,0,0.1); }
.subtitle {color: var(--primary); font-size: 1.2rem; font-weight: 300;}
.calendar-controls {display: flex; justify-content: center; align-items: center; margin-bottom: 20px; gap: 20px;}
.nav-btn {background: var(--primary); color: var(--white); border: none; padding: 12px 24px; border-radius: 50px; font-size: 1.1rem; cursor: pointer; transition: all 0.3s ease; box-shadow: 0 4px 15px rgba(138, 43, 226, 0.3);}
.nav-btn:hover {background: var(--primary-dark); transform: translateY(-2px);}
.nav-btn:active {transform: translateY(0);}
.calendar-container {display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 10px; margin-bottom: 10px;}
@media (min-width: 768px) {.calendar-container {grid-template-columns: repeat(6, 1fr);}}
.month-card {background: var(--white); border-radius: 20px; padding: 10px; box-shadow: 0 8px 30px rgba(138, 43, 226, 0.2); transition: transform 0.3s ease; border: 2px solid var(--primary-light);}
.month-card:hover {transform: translateY(-5px);}
.month-header {text-align: center; margin-bottom: 10px; color: var(--primary-dark); font-size: 1.3rem; font-weight: 600; padding: 10px; background: linear-gradient(135deg, var(--primary-light) 0%, var(--accent) 100%); color: var(--white); border-radius: 12px;}
.weekdays {display: grid; grid-template-columns: repeat(7, 1fr); text-align: center; font-weight: 600; color: var(--primary); margin-bottom: 10px; font-size: 0.9rem;}
.days-grid {display: grid; grid-template-columns: repeat(7, 1fr); gap: 4px;}
.day {aspect-ratio: 1; display: flex; align-items: center; justify-content: center; font-size: 0.9rem; border-radius: 8px; transition: all 0.2s ease; cursor: pointer;}
.day:hover {background: var(--light);}
.day.empty {visibility: hidden;}
.day.period {background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%); color: var(--white); font-weight: bold; box-shadow: 0 2px 8px rgba(138, 43, 226, 0.4);}
.day.period:hover {transform: scale(1.1); box-shadow: 0 4px 15px rgba(138, 43, 226, 0.6);}
.day.today {background: var(--primary-light); color: var(--white); font-weight: bold;}
.settings-section {background: var(--white); padding: 30px; border-radius: 20px; box-shadow: 0 8px 30px rgba(138, 43, 226, 0.2); margin-top: 20px; border: 2px solid var(--primary-light);}
.settings-section h2 {color: var(--primary-dark); margin-bottom: 20px; text-align: center;}
.settings-form {display: flex; flex-direction: column; gap: 15px; max-width: 500px; margin: 0 auto;}
.form-group {display: flex; flex-direction: column; gap: 8px;}
.form-group label {color: var(--primary); font-weight: 500;}
.form-group input {padding: 12px; border: 2px solid var(--primary-light); border-radius: 12px; font-size: 1rem; transition: border-color 0.3s ease;}
.form-group input:focus {outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(138, 43, 226, 0.2);}
.submit-btn {background: var(--primary); color: var(--white); border: none; padding: 14px; border-radius: 12px; font-size: 1.1rem; font-weight: 600; cursor: pointer; transition: all 0.3s ease; margin-top: 10px;}
.submit-btn:hover {background: var(--primary-dark);}
footer {text-align: center; margin-top: 40px; color: var(--primary-dark); font-size: 0.9rem; padding: 20px;}

/* Mobile optimizations */
@media (max-width: 767px) {.container {padding: 10px;}
h1 {font-size: 2rem;}
.calendar-container {grid-template-columns: 1fr;}
.month-card {padding: 15px;}
.month-header {font-size: 1.1rem;}
.nav-btn {padding: 10px 16px; font-size: 0.9rem;}}

/* Animation for period days */
@keyframes pulse {0% {transform: scale(1);} 50% { transform: scale(1.05); } 100% { transform: scale(1); }}
.day.period {animation: pulse 2s infinite;}
</style>