/*
================================================
KRA Tax Calculator Suite - main.css
================================================
Author: Joweni.com & Gemini
Version: 3.1 (Final with Design Revisions)
Description: Unified stylesheet for the entire
             KRA Tax Calculator suite, implementing
             the new color scheme and notebook style.
================================================
*/

/* Import Handwriting Font for Notebook Style */
@import url('https://fonts.googleapis.com/css2?family=Kalam:wght@400;700&display=swap');

/* --------------------------------------------------
1. ROOT VARIABLES & THEME SETUP
-------------------------------------------------- */
:root {
    /* New Color Palette */
    --primary-green: #2E4237;
    --accent-green: #9FE870;
    --light-green: #F3F9F0;
    --background-light: #F7F8F9;
    --background-dark: #121814;
    --text-light: #FFFFFF;
    --text-dark: #0F172A;
    --text-secondary-light: #CBD5E1;
    --text-secondary-dark: #64748B;
    --border-light: #E2E8F0;
    --border-dark: #2C3E34;
    --card-bg-light: #FFFFFF;
    --card-bg-dark: #1A251E;
    --shadow-light: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);

    /* Semantic Colors */
    --color-error: #EF4444;
    --color-success: #10B981;
    --color-info: #3B82F6;
    --color-warning: #F59E0B;
    --color-deadline: #DC2626;

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-monospace: 'Roboto Mono', monospace;
    --font-handwriting: 'Kalam', cursive;
    --font-size-base: 16px;
    --line-height-base: 1.7;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;

    /* Spacing & Layout */
    --spacing-unit: 8px;
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 16px;
    --shadow-md: var(--shadow-light);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --max-width-container: 1280px;
    --transition-speed: 0.3s;
}

/* Light Theme (Default) */
[data-theme="light"] {
    --color-background-page: var(--background-light);
    --color-background-card: var(--card-bg-light);
    --color-background-hover: var(--light-green);
    --color-text-primary: var(--text-dark);
    --color-text-secondary: var(--text-secondary-dark);
    --color-border: var(--border-light);
    --color-input-background: var(--card-bg-light);
    --color-input-border: var(--border-light);
    --color-footer-bg: var(--primary-green);
    --color-footer-text: var(--text-secondary-light);
    --color-footer-heading: var(--text-light);
    --primary-green-focus-shadow: rgba(159, 232, 112, 0.5);
}

/* Dark Theme */
[data-theme="dark"] {
    --color-background-page: var(--background-dark);
    --color-background-card: var(--card-bg-dark);
    --color-background-hover: rgba(159, 232, 112, 0.08);
    --color-text-primary: var(--text-light);
    --color-text-secondary: var(--text-secondary-light);
    --color-border: var(--border-dark);
    --color-input-background: var(--card-bg-dark);
    --color-input-border: var(--border-dark);
    --color-footer-bg: #000000;
    --color-footer-text: var(--text-secondary-light);
    --color-footer-heading: var(--text-light);
    --primary-green-focus-shadow: rgba(159, 232, 112, 0.5);
}

/* --------------------------------------------------
2. BASE & GLOBAL STYLES
-------------------------------------------------- */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: var(--font-size-base);
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-background-page);
    color: var(--color-text-primary);
    line-height: var(--line-height-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

.container {
    max-width: var(--max-width-container);
    margin-left: auto;
    margin-right: auto;
    padding: 0 calc(var(--spacing-unit) * 2);
}

/* --------------------------------------------------
3. HEADER & NAVIGATION
-------------------------------------------------- */
.app-header {
    background-color: var(--primary-green);
    border-bottom: 1px solid var(--border-dark);
    position: sticky;
    top: 0;
    z-index: 100;
    width: 100%;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 60px;
}

.logo-link {
    text-decoration: none;
}

.logo-text {
    font-size: 1.25rem;
    font-weight: var(--font-weight-bold);
    color: var(--text-light);
}

.app-controls {
    display: flex;
    align-items: center;
    gap: calc(var(--spacing-unit) * 2);
}

.control-btn {
    background: none;
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: var(--text-light);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    cursor: pointer;
    transition: all 0.2s;
}

.control-btn:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.main-nav {
    border-top: 1px solid var(--border-dark);
}

.nav-links-container {
    display: flex;
    justify-content: center;
}

.nav-links {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-unit);
    padding: var(--spacing-unit) 0;
}

.nav-link {
    text-decoration: none;
    color: rgba(255, 255, 255, 0.85);
    font-weight: var(--font-weight-medium);
    padding: var(--spacing-unit) calc(var(--spacing-unit) * 1.5);
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: color var(--transition-speed), background-color var(--transition-speed);
    border-radius: var(--border-radius-md);
}

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

.icon-small {
    width: 16px;
    height: 16px;
}

.dropdown {
    position: relative;
}

.dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--color-background-card);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-lg);
    min-width: 220px;
    padding: var(--spacing-unit);
    z-index: 110;
    animation: fadeIn 0.2s ease-out;
}

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

.dropdown-menu-item {
    display: block;
    padding: var(--spacing-unit) calc(var(--spacing-unit) * 1.5);
    color: var(--color-text-secondary);
    text-decoration: none;
    border-radius: var(--border-radius-sm);
}

.dropdown-menu-item:hover {
    background-color: var(--color-background-hover);
    color: var(--color-text-primary);
}

/* Mobile Navigation */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-light);
    cursor: pointer;
    padding: var(--spacing-unit);
}

.mobile-nav-menu {
    position: fixed;
    top: 0;
    left: -100%;
    width: 80%;
    max-width: 300px;
    height: 100vh;
    background-color: var(--color-background-card);
    box-shadow: var(--shadow-lg);
    transition: left 0.4s ease-in-out;
    z-index: 101;
    display: flex;
    flex-direction: column;
}

.mobile-nav-menu.open {
    left: 0;
}

.mobile-nav-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: calc(var(--spacing-unit) * 2);
    border-bottom: 1px solid var(--color-border);
}

.mobile-nav-header .logo-text {
    color: var(--color-text-primary);
}

.mobile-menu-close {
    background: none;
    border: none;
    color: var(--color-text-secondary);
    cursor: pointer;
}

.mobile-nav-content {
    padding: var(--spacing-unit);
    flex-grow: 1;
    overflow-y: auto;
}

.mobile-nav-content .nav-links {
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
}

.mobile-nav-content .nav-link {
    display: block;
    width: 100%;
    padding: calc(var(--spacing-unit) * 1.5);
    color: var(--color-text-secondary);
}

.mobile-nav-content .nav-link:hover {
    color: var(--primary-green);
    background-color: var(--accent-green);
}

.mobile-nav-content .dropdown .nav-link {
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
}

.mobile-nav-content .dropdown-menu {
    position: static;
    display: block;
    border: none;
    box-shadow: none;
    padding: 0;
    padding-left: var(--spacing-unit);
    background-color: transparent;
    min-width: auto;
}

.mobile-nav-footer {
    padding: calc(var(--spacing-unit) * 2);
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: center;
}

.mobile-nav-footer .control-btn {
    color: var(--color-text-secondary);
    border-color: var(--color-border);
}

.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.4s ease-in-out, visibility 0.4s ease-in-out;
    z-index: 100;
}

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

/* --------------------------------------------------
4. MAIN CONTENT & LAYOUT
-------------------------------------------------- */
main {
    padding: 0;
}

.content-section {
    padding: calc(var(--spacing-unit) * 6) 0;
}

.section-title {
    text-align: center;
    font-size: 2.2rem;
    font-weight: var(--font-weight-extrabold);
    margin-bottom: calc(var(--spacing-unit) * 4);
    line-height: 1.2;
}

/* Section Backgrounds */
.section-bg-green {
    background-color: var(--primary-green);
    color: var(--text-light);
}

.section-bg-green .section-title,
.section-bg-green .timeline-content h4 {
    color: var(--text-light);
}

.section-bg-green .timeline-content p {
    color: var(--text-secondary-light);
}

/* Hero Section */
.hero-card {
    background-color: var(--card-bg-light);
    color: var(--text-dark);
    border-radius: var(--border-radius-lg);
    padding: calc(var(--spacing-unit) * 6);
    text-align: center;
    border: 1px solid var(--border-light);
    margin: 0 auto;
    box-shadow: var(--shadow-lg);
}

[data-theme="dark"] .hero-card {
    background-color: var(--card-bg-dark);
    color: var(--text-light);
    border-color: var(--border-dark);
}

.section-bg-green .hero-title {
    font-size: 2.8rem;
    font-weight: var(--font-weight-extrabold);
    color: var(--text-dark); /* For white card */
}

[data-theme="dark"] .section-bg-green .hero-title {
    color: var(--text-light);
}

.hero-text-container {
    max-width: 800px;
    margin: var(--spacing-unit) auto calc(var(--spacing-unit) * 4);
}

.hero-text {
    font-size: 1.1rem;
    font-weight: var(--font-weight-normal);
    color: var(--text-secondary-dark); /* For white card */
    margin-bottom: var(--spacing-unit);
}

[data-theme="dark"] .hero-text {
    color: var(--text-secondary-light);
}

/* Highlights Section */
.highlight-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: calc(var(--spacing-unit) * 4);
}

.highlight-card {
    padding: calc(var(--spacing-unit) * 3);
}

.deadline-card {
    background: linear-gradient(45deg, var(--color-deadline), #be123c);
    color: white;
    text-align: center;
}

.deadline-card .card-icon {
    color: white;
}

.deadline-text {
    font-size: 1.1rem;
    font-weight: var(--font-weight-medium);
}

.deadline-countdown {
    font-size: 2.5rem;
    font-weight: var(--font-weight-extrabold);
    font-family: var(--font-monospace);
    margin: var(--spacing-unit) 0;
}

.deadline-date {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* Finance Act Notebook Style */
.highlight-card .highlight-list {
    list-style: none;
    padding: 0;
    margin: var(--spacing-unit) 0;
    color: var(--color-text-secondary);
    font-family: var(--font-handwriting);
    font-size: 1.1rem;
    line-height: 2;
    background-image: repeating-linear-gradient(transparent, transparent 33px, var(--color-border) 33px, var(--color-border) 34px);
}

.highlight-card .highlight-list li {
    display: flex;
    align-items: center;
    gap: var(--spacing-unit);
    margin-bottom: calc(var(--spacing-unit) / 2);
}

.highlight-card .highlight-list i {
    width: 18px;
    height: 18px;
    color: var(--accent-green);
    flex-shrink: 0;
}

.quick-tool-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-unit);
    margin-top: var(--spacing-unit);
}

/* Card Grid Layout */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: calc(var(--spacing-unit) * 4);
}

.card {
    background-color: var(--color-background-card);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--color-border);
    padding: calc(var(--spacing-unit) * 3);
    transition: transform 0.2s ease-out, box-shadow 0.2s ease-out;
    display: flex;
    flex-direction: column;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.calculator-card .card-icon {
    color: var(--accent-green);
    margin-bottom: var(--spacing-unit);
}

.calculator-card .card-icon i {
    width: 32px;
    height: 32px;
}

.card-title {
    font-size: 1.25rem;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-unit);
    display: flex;
    align-items: center;
    gap: var(--spacing-unit);
}

.card-description {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    flex-grow: 1;
    margin-bottom: calc(var(--spacing-unit) * 3);
}

.service-card .card-title i {
    width: 20px;
    height: 20px;
    color: var(--color-info);
}

/* Visual Tax Calendar */
.tax-calendar-container {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    padding: calc(var(--spacing-unit) * 2) 0;
}

.tax-calendar-container::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0;
    bottom: 0;
    width: 2px;
    background-color: var(--border-dark);
}

.timeline-item {
    position: relative;
    padding-left: 60px;
    margin-bottom: calc(var(--spacing-unit) * 4);
}

.timeline-icon {
    position: absolute;
    left: 0;
    top: 0;
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background-color: var(--accent-green);
    border: 2px solid var(--accent-green);
    display: grid;
    place-items: center;
    color: var(--primary-green);
}

/* --------------------------------------------------
5. BUTTONS & FORMS
-------------------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-unit);
    padding: calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 3);
    border-radius: var(--border-radius-md);
    font-weight: var(--font-weight-semibold);
    font-size: 1rem;
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s;
    text-align: center;
}

.btn:active {
    transform: translateY(1px);
}

.btn-primary {
    background-color: var(--accent-green);
    color: var(--primary-green);
    border-color: var(--accent-green);
}

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

.section-bg-green .btn-primary {
    background-color: var(--accent-green);
    color: var(--primary-green);
    border-color: var(--accent-green);
}
.section-bg-green .btn-primary:hover {
     background-color: var(--text-light);
     border-color: var(--text-light);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-text-primary);
    border-color: var(--color-border);
}

.btn-secondary:hover {
    background-color: var(--color-background-hover);
    border-color: var(--accent-green);
    color: var(--accent-green);
}

.btn-lg {
    padding: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 4);
    font-size: 1.1rem;
}

.btn-full-width {
    width: 100%;
}

.currency-input {
    width: 100%;
    padding: calc(var(--spacing-unit) * 1.5);
    border: 1px solid var(--color-input-border);
    border-radius: var(--border-radius-md);
    font-family: var(--font-monospace);
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
    background-color: var(--color-input-background);
    color: var(--color-text-primary);
}

.currency-input:focus {
    outline: none;
    border-color: var(--accent-green);
    box-shadow: 0 0 0 3px var(--primary-green-focus-shadow);
}

/* --------------------------------------------------
6. FAQ SECTION
-------------------------------------------------- */
.faq-container {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-unit);
}

.faq-item {
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-md);
    transition: background-color .2s;
}

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

.faq-item[open] {
    background-color: var(--color-background-hover);
}

.faq-item summary {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: calc(var(--spacing-unit) * 2);
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    list-style: none;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: '+';
    font-size: 1.5rem;
    font-weight: 300;
    transition: transform 0.3s ease;
    flex-shrink: 0;
    margin-left: var(--spacing-unit);
    color: var(--accent-green);
}

.faq-item[open] summary::after {
    transform: rotate(45deg);
}

.faq-item .answer {
    padding: 0 calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 2);
    color: var(--color-text-secondary);
}

.faq-item .answer p {
    margin: 0;
}

.faq-item .answer a {
    color: var(--accent-green);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
}

.faq-item .answer a:hover {
    text-decoration: underline;
}

/* --------------------------------------------------
7. FOOTER
-------------------------------------------------- */
.site-footer {
    margin-top: calc(var(--spacing-unit) * 8);
    background-color: var(--color-footer-bg);
    color: var(--color-footer-text);
    width: 100%;
}

.footer-content-wrapper {
    padding: calc(var(--spacing-unit) * 5) calc(var(--spacing-unit) * 2);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: calc(var(--spacing-unit) * 4);
    padding-bottom: calc(var(--spacing-unit) * 3);
}

.footer-column h4 {
    font-size: 1rem;
    font-weight: var(--font-weight-bold);
    margin-bottom: calc(var(--spacing-unit) * 2);
    color: var(--color-footer-heading);
}

.footer-column p,
.footer-column li {
    font-size: 0.9rem;
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-unit);
}

.footer-links a {
    text-decoration: none;
    color: var(--color-footer-text);
    transition: color var(--transition-speed);
}

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

.footer-bottom {
    border-top: 1px solid var(--border-dark);
    padding-top: calc(var(--spacing-unit) * 3);
    text-align: center;
    font-size: 0.85rem;
}

.footer-bottom p {
    margin-bottom: calc(var(--spacing-unit) / 2);
}

.footer-bottom strong {
    color: var(--color-footer-heading);
}

/* --------------------------------------------------
8. RESPONSIVE DESIGN
-------------------------------------------------- */
@media (max-width: 1023px) {
    .main-nav {
        display: none;
    }
    .mobile-menu-toggle {
        display: block;
    }
}

@media (max-width: 767px) {
    .hero-title {
        font-size: 2rem;
    }
    .section-title {
        font-size: 1.8rem;
    }
    .card-grid, .highlight-grid {
        grid-template-columns: 1fr;
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    .tax-calendar-container::before {
        left: 20px;
    }
    .timeline-item {
        padding-left: 55px;
    }
    .timeline-icon {
        width: 40px;
        height: 40px;
    }
}

@media (max-width: 480px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

/* --------------------------------------------------
9. KEYFRAME ANIMATIONS & UTILITIES
-------------------------------------------------- */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.scroll-to-btn {
    cursor: pointer;
}