/* 
   Premium SaaS-inspired Age Calculator
   Author: CodeYantra
*/

:root {
    /* Colors */
    --color-primary: #2563EB;
    --color-primary-hover: #1D4ED8;
    --color-primary-light: #EFF6FF;
    --color-background: #F8FAFC;
    --color-surface: #FFFFFF;
    
    --color-text-main: #0F172A;
    --color-text-muted: #64748B;
    --color-border: #E2E8F0;
    
    --color-success: #10B981;
    
    /* Stat Icon Colors */
    --color-icon-months: #F59E0B;
    --color-icon-months-bg: #FEF3C7;
    --color-icon-weeks: #8B5CF6;
    --color-icon-weeks-bg: #EDE9FE;
    --color-icon-days: #EC4899;
    --color-icon-days-bg: #FCE7F3;
    --color-icon-next-bday: #14B8A6;
    --color-icon-next-bday-bg: #CCFBF1;
    --color-icon-dob: #F43F5E;
    --color-icon-dob-bg: #FFE4E6;

    /* Typography */
    --font-family: 'Inter', sans-serif;
    
    /* Shadows & Border Radius */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.025);
    --radius-md: 8px;
    --radius-lg: 18px;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-background);
    color: var(--color-text-main);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    text-decoration: none;
    color: inherit;
}

button {
    font-family: var(--font-family);
    cursor: pointer;
    border: none;
    outline: none;
    background: transparent;
}

/* Header */
.header {
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text-main);
}

.logo-icon {
    font-size: 1.5rem;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-link {
    color: var(--color-text-muted);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-link:hover, .nav-link.active {
    color: var(--color-primary);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -1.25rem;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--color-primary);
    border-radius: 2px;
}

.header-contact {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--color-text-muted);
    font-size: 0.875rem;
    font-weight: 500;
    transition: var(--transition);
}

.contact-link:hover {
    color: var(--color-primary);
}

/* Main Layout */
.main-content {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 3rem 1rem;
}

.calculator-wrapper {
    width: 100%;
    max-width: 580px;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* Cards */
.card {
    background-color: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 2rem;
    border: 1px solid rgba(226, 232, 240, 0.5);
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-lg);
}

.card-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.card-header p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
}

/* Input Group */
.input-group {
    margin-bottom: 1.5rem;
}

.input-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--color-text-main);
}

.date-input-wrapper {
    position: relative;
}

input[type="date"] {
    width: 100%;
    padding: 0.875rem 1rem;
    font-family: var(--font-family);
    font-size: 1rem;
    color: var(--color-text-main);
    background-color: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: var(--transition);
    outline: none;
    appearance: none;
}

input[type="date"]::-webkit-calendar-picker-indicator {
    cursor: pointer;
    opacity: 0.6;
    transition: var(--transition);
}

input[type="date"]::-webkit-calendar-picker-indicator:hover {
    opacity: 1;
}

input[type="date"]:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
    background-color: var(--color-surface);
}

/* Buttons */
.button-group {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: var(--transition);
    flex: 1;
    min-width: 120px;
}

.btn-primary {
    background-color: var(--color-primary);
    color: white;
    box-shadow: 0 4px 6px -1px rgba(37, 99, 235, 0.2);
}

.btn-primary:hover {
    background-color: var(--color-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 8px -1px rgba(37, 99, 235, 0.3);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
}

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

.btn-outline {
    border: 1px solid var(--color-border);
    color: var(--color-text-muted);
}

.btn-outline:hover {
    border-color: var(--color-text-main);
    color: var(--color-text-main);
    background-color: #F1F5F9;
}

/* Result Section */
.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.result-header h2 {
    font-size: 1.25rem;
    font-weight: 700;
}

.btn-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    color: var(--color-text-muted);
    background-color: var(--color-background);
    transition: var(--transition);
}

.btn-icon:hover {
    color: var(--color-primary);
    background-color: var(--color-primary-light);
}

.primary-result {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.result-box {
    background-color: var(--color-primary);
    border-radius: var(--radius-md);
    padding: 1.5rem 1rem;
    text-align: center;
    color: white;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    box-shadow: 0 4px 6px -1px rgba(37, 99, 235, 0.2);
    position: relative;
    overflow: hidden;
}

.result-box::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0) 100%);
    pointer-events: none;
}

.result-value {
    font-size: 2.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 0.25rem;
}

.result-label {
    font-size: 0.875rem;
    font-weight: 500;
    opacity: 0.9;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.divider {
    height: 1px;
    background-color: var(--color-border);
    margin: 1.5rem 0;
}

.detailed-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.stat-item:hover {
    background-color: var(--color-background);
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.months-icon { color: var(--color-icon-months); background-color: var(--color-icon-months-bg); }
.weeks-icon { color: var(--color-icon-weeks); background-color: var(--color-icon-weeks-bg); }
.days-icon { color: var(--color-icon-days); background-color: var(--color-icon-days-bg); }
.next-bday-icon { color: var(--color-icon-next-bday); background-color: var(--color-icon-next-bday-bg); }
.dob-icon { color: var(--color-icon-dob); background-color: var(--color-icon-dob-bg); }

.stat-info {
    display: flex;
    flex-direction: column;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-value {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-text-main);
}

/* Footer */
.footer {
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: 1.5rem;
    text-align: center;
    margin-top: auto;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    align-items: center;
}

.footer p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

.brand {
    font-weight: 600;
    color: var(--color-text-main);
}

.footer-links {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.footer-links a {
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--color-primary);
}

.dot {
    color: var(--color-border);
}

/* Utility Classes */
.hidden {
    display: none !important;
}

/* Animations */
@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

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

.slide-up {
    animation: slideUp 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.fade-in {
    animation: fadeIn 0.5s ease-out forwards;
}

.animate-count {
    animation: countUp 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.toast {
    background-color: var(--color-surface);
    color: var(--color-text-main);
    padding: 1rem 1.5rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 500;
    font-size: 0.95rem;
    transform: translateY(100%);
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    border-left: 4px solid var(--color-primary);
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

.toast.success {
    border-left-color: var(--color-success);
}
.toast.success .toast-icon {
    color: var(--color-success);
}

.toast.error {
    border-left-color: var(--color-icon-dob);
}
.toast.error .toast-icon {
    color: var(--color-icon-dob);
}

.toast-icon {
    display: flex;
    align-items: center;
    justify-content: center;
}