/* ========================================
   Days From Today - Modern CSS Stylesheet
   ======================================== */

/* CSS Custom Properties */
:root {
    /* Colors */
    --color-primary: #4f46e5;
    --color-primary-dark: #4338ca;
    --color-primary-light: #818cf8;
    --color-secondary: #0ea5e9;

    --color-bg: #f8fafc;
    --color-bg-alt: #f1f5f9;
    --color-surface: #ffffff;
    --color-surface-raised: #ffffff;

    --color-text: #1e293b;
    --color-text-muted: #64748b;
    --color-text-light: #94a3b8;

    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;

    --color-success: #22c55e;
    --color-error: #ef4444;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text);
    background: linear-gradient(135deg, #fdfbfb 0%, #ebedee 100%);
    /* Fallback/Default */
    background: linear-gradient(135deg, #F0F4FF 0%, #F5F3FF 50%, #FFF4F2 100%);
    /* Subtle Indigo -> Violet -> Rose tint */
    background-attachment: fixed;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
}

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

ul,
ol {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

button,
input {
    font-family: inherit;
    font-size: inherit;
}

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ========================================
   Header
   ======================================== */
.header {
    background: rgba(255, 255, 255, 0.8);
    border-bottom: 1px solid rgba(226, 232, 240, 0.6);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(12px);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    transition: transform var(--transition-base);
}

.logo:hover {
    transform: scale(1.02);
}

.logo-text {
    display: flex;
    align-items: baseline;
    gap: 0.35rem;
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.logo-highlight {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-secondary {
    color: var(--color-text);
    font-weight: 600;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.nav-link {
    font-weight: 500;
    color: var(--color-text-muted);
    padding: var(--spacing-sm) 0;
    position: relative;
    transition: color var(--transition-base);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width var(--transition-base);
}

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

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

/* Dropdown Menu */
.dropdown {
    position: relative;
}

.dropdown-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

.dropdown-arrow {
    transition: transform var(--transition-base);
}

.dropdown:hover .dropdown-arrow {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    transform: translateY(10px);
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(226, 232, 240, 0.8);
    border-radius: 0.75rem;
    box-shadow: 0 20px 40px -12px rgba(0, 0, 0, 0.12);
    padding: 0.5rem;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: 1000;
    width: 400px;
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.25rem;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem;
    border-radius: 0.5rem;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.dropdown-item:hover {
    background: var(--color-bg-alt);
}

.dropdown-icon {
    width: 28px;
    height: 28px;
    border-radius: 0.375rem;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    color: white;
}

.dropdown-icon svg {
    width: 14px;
    height: 14px;
}

.dropdown-text {
    display: flex;
    flex-direction: column;
    min-width: 0;
    overflow: hidden;
}

.dropdown-item-title {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.dropdown-item-desc {
    font-size: 0.65rem;
    color: var(--color-text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Mobile Navigation Toggle */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.hamburger {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    position: relative;
    transition: background var(--transition-fast);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--color-text);
    transition: transform var(--transition-base);
}

.hamburger::before {
    top: -7px;
}

.hamburger::after {
    top: 7px;
}

.nav-toggle[aria-expanded="true"] .hamburger {
    background: transparent;
}

.nav-toggle[aria-expanded="true"] .hamburger::before {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle[aria-expanded="true"] .hamburger::after {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    padding: var(--spacing-3xl) 0;
    background: transparent;
    /* Changed from gradient to transparent to let body background show */
    text-align: center;
}

.hero-content {
    max-width: 920px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: var(--color-primary);
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 500;
    margin-bottom: var(--spacing-lg);
    box-shadow: 0 4px 6px rgba(79, 70, 229, 0.2);
}

.hero h1 {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.hero-description {
    font-size: var(--font-size-lg);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-2xl);
    max-width: 560px;
    margin-left: auto;
    margin-right: auto;
}

/* Calculator Card */
.calculator-card {
    background: rgba(255, 255, 255, 0.7);
    /* Frosted glass effect */
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.8);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: 0 20px 40px -5px rgba(0, 0, 0, 0.05), 0 10px 20px -5px rgba(50, 50, 93, 0.05);
    /* Softer shadow */
    max-width: 100%;
    margin: 0 auto;
}

.calculator-input-group {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.input-wrapper {
    flex: 1;
    position: relative;
}

.input-wrapper input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-lg);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    outline: none;
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
    text-align: center;
    background: rgba(255, 255, 255, 0.9);
}

.input-wrapper input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.input-wrapper input::placeholder {
    color: var(--color-text-light);
}

.input-label {
    position: absolute;
    top: -10px;
    left: 12px;
    background: var(--color-surface);
    padding: 0 var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    font-weight: 500;
}

.btn-calculate {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-2xl);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    font-size: var(--font-size-lg);
    font-weight: 600;
    cursor: pointer;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    white-space: nowrap;
}

.btn-calculate:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(79, 70, 229, 0.3);
}

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

.btn-calculate svg {
    width: 20px;
    height: 20px;
}

.calculator-hint {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    margin-top: var(--spacing-sm);
}

/* Result Section */
.result-section {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border-light);
    display: none;
}

.result-section.active {
    display: block;
    animation: fadeIn var(--transition-slow);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    color: var(--color-success);
    font-weight: 600;
}

.result-header svg {
    width: 24px;
    height: 24px;
}

.result-main {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    color: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
}

.result-date {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.result-day {
    font-size: var(--font-size-lg);
    opacity: 0.9;
}

.result-details {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.result-detail-item {
    background: var(--color-bg-alt);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    text-align: center;
}

.result-detail-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xs);
}

.result-detail-value {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text);
}

/* Mini Calendar */
.mini-calendar {
    margin-top: var(--spacing-lg);
    background: var(--color-bg-alt);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
}

.mini-calendar-header {
    text-align: center;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.mini-calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 2px;
    text-align: center;
    font-size: var(--font-size-sm);
}

.mini-calendar-day-name {
    font-weight: 600;
    color: var(--color-text-muted);
    padding: var(--spacing-xs);
}

.mini-calendar-day {
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
}

.mini-calendar-day.current-month {
    color: var(--color-text);
}

.mini-calendar-day.today {
    background: var(--color-border);
    font-weight: 500;
}

.mini-calendar-day.target {
    background: var(--color-primary);
    color: white;
    font-weight: 600;
}

/* Error Message */
.error-message {
    background: #fef2f2;
    color: var(--color-error);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-top: var(--spacing-md);
    font-weight: 500;
    display: none;
}

.error-message.active {
    display: block;
    animation: shake 0.4s ease;
}

@keyframes shake {

    0%,
    100% {
        transform: translateX(0);
    }

    20%,
    60% {
        transform: translateX(-5px);
    }

    40%,
    80% {
        transform: translateX(5px);
    }
}

/* ========================================
   Preset Calculators Section
   ======================================== */
/* ========================================
   Preset Calculators Section
   ======================================== */
.presets-section {
    padding: var(--spacing-3xl) 0;
    background: transparent;
    /* Changed to transparent */
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-header h2 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.section-header p {
    color: var(--color-text-muted);
    font-size: var(--font-size-lg);
    max-width: 560px;
    margin: 0 auto;
}

.presets-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}

.preset-card {
    background: rgba(255, 255, 255, 0.6);
    /* Glass effect */
    backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.6);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    cursor: pointer;
    transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.preset-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05);
    /* Softer hover shadow */
    border-color: var(--color-primary-light);
    background: rgba(255, 255, 255, 0.9);
}

.preset-card-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
    color: white;
}

.preset-card-icon svg {
    width: 24px;
    height: 24px;
}

.preset-card h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.preset-card p {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    line-height: 1.5;
}

.preset-card.past .preset-card-icon {
    background: linear-gradient(135deg, #f97316 0%, #ea580c 100%);
}

/* ========================================
   About Section
   ======================================== */
.about-section {
    padding: var(--spacing-3xl) 0;
    background: rgba(255, 255, 255, 0.3);
    /* Subtle separation */
    backdrop-filter: blur(4px);
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-content h2 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.about-text {
    color: var(--color-text-muted);
    font-size: var(--font-size-lg);
    line-height: 1.8;
    text-align: center;
}

.about-features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.about-feature {
    text-align: center;
}

.about-feature-icon {
    width: 56px;
    height: 56px;
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
    color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.about-feature-icon svg {
    width: 28px;
    height: 28px;
}

.about-feature h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.about-feature p {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background: rgba(255, 255, 255, 0.4);
    /* Translucent */
    color: var(--color-text-muted);
    padding: var(--spacing-xl) 0;
    border-top: 1px solid rgba(226, 232, 240, 0.5);
    margin-top: auto;
    backdrop-filter: blur(4px);
}

.footer-simple {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
    font-size: var(--font-size-sm);
}

.footer-simple-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.footer-simple-links a {
    color: var(--color-text-muted);
    transition: color var(--transition-base);
}

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

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 1024px) {
    .presets-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .about-features {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .footer-simple {
        flex-direction: column-reverse;
        text-align: center;
        gap: var(--spacing-lg);
    }

    :root {
        --font-size-4xl: 1.875rem;
        --font-size-3xl: 1.5rem;
        --spacing-3xl: 3rem;
    }

    .nav-toggle {
        display: block;
    }

    .nav {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-surface);
        border-bottom: 1px solid var(--color-border);
        padding: var(--spacing-lg);
        display: none;
        box-shadow: var(--shadow-lg);
    }

    .nav.active {
        display: block;
    }

    .nav-list {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .nav-link {
        display: block;
        padding: var(--spacing-md);
        text-align: center;
        border-radius: var(--radius-md);
    }

    .nav-link:hover {
        background: var(--color-bg-alt);
    }

    .nav-link::after {
        display: none;
    }

    /* Mobile Dropdown */
    .dropdown-menu {
        position: static;
        width: 100%;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        border: 1px solid var(--color-border-light);
        margin-top: 0.5rem;
        display: none;
    }

    .dropdown.active .dropdown-menu {
        display: block;
    }

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

    .dropdown-toggle {
        justify-content: center;
    }

    .hero {
        padding: var(--spacing-2xl) 0;
    }

    .calculator-input-group {
        flex-direction: column;
    }

    .btn-calculate {
        width: 100%;
    }

    .result-details {
        grid-template-columns: 1fr;
    }

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

    .about-features {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-logo {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }

    .calculator-card {
        padding: var(--spacing-lg);
    }

    .hero h1 {
        font-size: var(--font-size-2xl);
    }

    .preset-card {
        padding: var(--spacing-lg);
    }
}