/* Define CSS variables for light and dark themes */
:root {
    --bg-color-light: #f3f4f6;
    --container-bg-light: #ffffff;
    --text-color-light: #374151;
    --heading-color-light: #1f2937;
    --input-bg-light: #e5e7eb;
    --nin-box-bg-light: #e5e7eb;
    --nin-box-text-light: #4b5563;
    --copy-msg-light: #16a34a;
    --button-primary-bg-light: #2563eb;
    --button-primary-hover-light: #1d4ed8;
    --button-primary-text-light: #ffffff;
    --button-secondary-bg-light: #d1d5db;
    --button-secondary-hover-light: #9ca3af;
    --button-secondary-text-light: #1f2937;
    --input-focus-border-light: #3b82f6;
    --input-focus-shadow-light: rgba(59, 130, 246, 0.5);
    --info-text-color-light: #6b7280;
    --link-color-light: #2563eb;

    --bg-color-dark: #1f2937;
    --container-bg-dark: #374151;
    --text-color-dark: #f3f4f6;
    --heading-color-dark: #ffffff;
    --input-bg-dark: #4b5563;
    --nin-box-bg-dark: #4b5563;
    --nin-box-text-dark: #f3f4f6;
    --copy-msg-dark: #86efac;
    --button-primary-bg-dark: #60a5fa;
    --button-primary-hover-dark: #3b82f6;
    --button-primary-text-dark: #1f2937;
    --button-secondary-bg-dark: #6b7280;
    --button-secondary-hover-dark: #9ca3af;
    --button-secondary-text-dark: #f3f4f6;
    --input-focus-border-dark: #60a5fa;
    --input-focus-shadow-dark: rgba(96, 165, 250, 0.5);
    --info-text-color-dark: #9ca3af;
    --link-color-dark: #60a5fa;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-color-light);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 1rem;
    color: var(--text-color-light);
    /* Default text color */
}

/* Global variable usage based on theme class on the body */
body.light-theme {
    background-color: var(--bg-color-light);
    color: var(--text-color-light);
}

body.dark-theme {
    background-color: var(--bg-color-dark);
    color: var(--text-color-dark);
}

.container {
    background-color: var(--container-bg-light);
    padding: 2rem 1.5rem;
    border-radius: 1.5rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    max-width: 40rem;
    width: 100%;
    text-align: center;
    position: relative;
    /* Added for the toggle switch positioning */
}

body.dark-theme .container {
    background-color: var(--container-bg-dark);
}

/* --- Typography --- */

.heading {
    font-size: 2rem;
    font-weight: 800;
    color: var(--heading-color-light);
    margin-bottom: 1.5rem;
}

body.dark-theme .heading {
    color: var(--heading-color-dark);
}

.info-text {
    margin-top: 2rem;
    font-size: 0.875rem;
    color: var(--info-text-color-light);
    max-width: 20rem;
    margin-left: auto;
    margin-right: auto;
}

body.dark-theme .info-text {
    color: var(--info-text-color-dark);
}

.info-text a {
    color: var(--link-color-light);
    text-decoration: none;
    transition: color 0.3s ease;
}

body.dark-theme .info-text a {
    color: var(--link-color-dark);
}

.info-text a:hover {
    text-decoration: underline;
}

/* --- Input Fields & Date Pickers --- */

.input-section {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
    text-align: left;
}

@media (min-width: 768px) {
    .input-section {
        flex-direction: row;
        gap: 1.5rem;
    }
}

.input-group {
    width: 100%;
    margin: 10px;
}

.input-group label {
    display: block;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-color-light);
}

body.dark-theme .input-group label {
    color: var(--text-color-dark);
}

.input-field {
    background-color: var(--input-bg-light);
    padding: 0.75rem;
    border: 1px solid transparent;
    border-radius: 0.5rem;
    width: 100%;
    transition: all 0.2s ease-in-out;
    outline: none;
    color: var(--nin-box-text-light);
}

body.dark-theme .input-field {
    background-color: var(--input-bg-dark);
    color: var(--nin-box-text-dark);
}

.input-field:focus {
    border-color: var(--input-focus-border-light);
    box-shadow: 0 0 0 3px var(--input-focus-shadow-light);
}

body.dark-theme .input-field:focus {
    border-color: var(--input-focus-border-dark);
    box-shadow: 0 0 0 3px var(--input-focus-shadow-dark);
}

/* --- NIN Display --- */

.nin-display-wrapper {
    position: relative;
}

.nin-box {
    background-color: var(--nin-box-bg-light);
    padding: 1.5rem;
    border-radius: 1rem;
    font-family: monospace;
    font-size: 2rem;
    font-weight: 700;
    color: var(--nin-box-text-light);
    margin-bottom: 1.5rem;
    transition: all 0.3s ease-in-out;
}

body.dark-theme .nin-box {
    background-color: var(--nin-box-bg-dark);
    color: var(--nin-box-text-dark);
}

@media (min-width: 768px) {
    .nin-box {
        font-size: 2.25rem;
    }
}

.nin-box:hover {
    transform: scale(1.02);
}

.copy-message {
    position: absolute;
    bottom: -1rem;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--copy-msg-light);
    opacity: 0;
    transition: opacity 0.3s ease-in-out;
}

body.dark-theme .copy-message {
    color: var(--copy-msg-dark);
}

/* --- Buttons --- */

.button-section {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 1rem;
}

@media (min-width: 768px) {
    .button-section {
        flex-direction: row;
        gap: 1.5rem;
    }
}

.button-primary,
.button-secondary {
    font-weight: 700;
    padding: 0.75rem 2rem;
    border-radius: 9999px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    transition: all 0.3s ease-in-out;
    border: none;
    cursor: pointer;
}

.button-primary {
    background-color: var(--button-primary-bg-light);
    color: var(--button-primary-text-light);
}

body.dark-theme .button-primary {
    background-color: var(--button-primary-bg-dark);
    color: var(--button-primary-text-dark);
}

.button-primary:hover {
    background-color: var(--button-primary-hover-light);
    transform: translateY(-0.1rem);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

body.dark-theme .button-primary:hover {
    background-color: var(--button-primary-hover-dark);
}

.button-secondary {
    background-color: var(--button-secondary-bg-light);
    color: var(--button-secondary-text-light);
}

body.dark-theme .button-secondary {
    background-color: var(--button-secondary-bg-dark);
    color: var(--button-secondary-text-dark);
}

.button-secondary:hover {
    background-color: var(--button-secondary-hover-light);
    transform: translateY(-0.1rem);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

body.dark-theme .button-secondary:hover {
    background-color: var(--button-secondary-hover-dark);
}

/* --- Theme Switcher --- */
.theme-switch-wrapper {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-switch-label {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 34px;
}

.theme-switch-label input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: 0.4s;
}

.slider:before {
    position: absolute;
    content: "";
    height: 26px;
    width: 26px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: 0.4s;
}

input:checked+.slider {
    background-color: #2196F3;
}

input:checked+.slider:before {
    transform: translateX(26px);
}

.slider.round {
    border-radius: 34px;
}

.slider.round:before {
    border-radius: 50%;
}

.sun-icon {
    position: absolute;
    top: 50%;
    left: 10px;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    color: gold;
    transition: opacity 0.3s ease;
}

input:checked+.slider .sun-icon {
    opacity: 0;
}

.moon-icon {
    position: absolute;
    top: 50%;
    right: 10px;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    color: #f0f0f0;
    transition: opacity 0.3s ease;
    opacity: 0;
}

input:checked+.slider .moon-icon {
    opacity: 1;
}

.styler {
    font-family: "Qwitcher Grypen", cursive;
    font-weight: 400;
    font-style: normal;
    font-size: 70px;
}

.slab {
    font-family: "Roboto Slab", serif;
    font-optical-sizing: auto;
    font-style: normal;
}