/* --- CSS Variables and Base Styles --- */
:root {
    --color-primary: #0d6efd;
    --color-primary-light: #3b82f6;
    --color-primary-dark: #0a58ca;
    --color-secondary: #6c757d;
    --color-success: #198754;
    --color-warning: #ffca2c;
    --color-danger: #dc3545;
    --color-indigo: #6610f2;

    --bg-light: #f8f9fa;
    --bg-dark: #111827;
    --card-bg-light: #ffffff;
    --card-bg-dark: #1f2937;
    --text-light: #1f2937;
    --text-dark: #f9fafb;
    --text-muted-light: #6b7280;
    --text-muted-dark: #9ca3af;
    --border-light: #e5e7eb;
    --border-dark: #374151;

    --font-primary: 'Inter', sans-serif;
    --font-mono: 'Roboto Mono', monospace;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
    --border-radius: 1rem;
    --transition-speed: 0.3s;
}

html.dark {
    --bg-light: var(--bg-dark);
    --card-bg-light: var(--card-bg-dark);
    --text-light: var(--text-dark);
    --text-muted-light: var(--text-muted-dark);
    --border-light: var(--border-dark);
}

body {
    font-family: var(--font-primary);
    background-color: var(--bg-light);
    color: var(--text-light);
    transition: background-color var(--transition-speed), color var(--transition-speed);
    scroll-behavior: smooth;
    line-height: 1.6;
}
body.menu-open {
    overflow: hidden;
}

/* --- Initial Load & Scroll Animations --- */
body.is-loading .hero-section,
body.is-loading #generator {
    opacity: 0;
    transform: translateY(20px);
}
.hero-section, #generator {
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.animate-on-scroll {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.animate-on-scroll.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- Layout & Typography --- */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1rem;
}
.hero-section {
    text-align: center;
    margin-top: 3rem;
    margin-bottom: 4rem;
}
.main-heading {
    font-size: clamp(2.2rem, 5vw, 3.5rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    background: linear-gradient(90deg, var(--color-primary), var(--color-indigo));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.sub-heading {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    max-width: 60ch;
    margin: 1rem auto 0;
    color: var(--text-muted-light);
}
.section-heading {
    font-size: clamp(1.8rem, 4vw, 2.25rem);
    font-weight: 700;
    margin-bottom: 1rem;
    text-align: center;
}

/* --- Header --- */
.site-header {
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 50;
    transition: background-color var(--transition-speed);
}
html.dark .site-header {
    background-color: rgba(17, 24, 39, 0.8);
}
.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 4.5rem;
}
.logo {
    display: flex;
    align-items: center;
    font-size: 1.25rem;
    font-weight: 700;
    text-decoration: none;
    color: var(--text-light);
    z-index: 101;
}
.logo .material-symbols-outlined { color: var(--color-primary); margin-right: 0.5rem; }
.header-actions { display: flex; align-items: center; gap: 0.5rem; }
.mobile-menu-btn { display: block; z-index: 101; }

/* --- Mobile Navigation --- */
.mobile-nav-panel {
    position: fixed;
    top: 0;
    right: 0;
    width: 300px;
    max-width: 80%;
    height: 100%;
    background-color: var(--card-bg-light);
    transform: translateX(100%);
    transition: transform 0.4s cubic-bezier(0.23, 1, 0.32, 1);
    z-index: 102;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    box-shadow: -5px 0 15px rgba(0,0,0,0.1);
}
html.dark .mobile-nav-panel {
    box-shadow: -5px 0 15px rgba(0,0,0,0.3);
}

.menu-open .mobile-nav-panel {
    transform: translateX(0);
}
.mobile-nav-panel a {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-muted-light);
    text-decoration: none;
    transition: color var(--transition-speed);
}
.mobile-nav-panel a:hover { color: var(--color-primary); }

.mobile-menu-close-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none !important;
    color: var(--text-muted-light);
    padding: 0.5rem;
}
.mobile-menu-close-btn:hover {
    color: var(--color-danger);
    transform: none;
    box-shadow: none;
}
.mobile-menu-close-btn .material-symbols-outlined {
    font-size: 2rem;
}

.menu-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 100;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.4s, visibility 0.4s;
}
.menu-open .menu-backdrop {
    opacity: 1;
    visibility: visible;
}

/* --- Main Card & Tabs --- */
.card {
    background-color: var(--card-bg-light);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-lg);
    margin-top: 2rem;
    transition: background-color var(--transition-speed);
}
@media (min-width: 640px) {
    .card { padding: 2rem; }
}
.tab-nav {
    display: flex;
    gap: 1.5rem;
    border-bottom: 1px solid var(--border-light);
    margin-bottom: 1.5rem;
    overflow-x: auto;
    -ms-overflow-style: none;
    scrollbar-width: none;
}
.tab-nav::-webkit-scrollbar { display: none; }
.tab-btn {
    background: none; border: none; padding: 1rem 0.25rem; font-size: 0.875rem; font-weight: 600;
    color: var(--text-muted-light); cursor: pointer; border-bottom: 2px solid transparent;
    transition: color var(--transition-speed), border-color var(--transition-speed);
    white-space: nowrap;
}
.tab-btn.active { color: var(--color-primary); border-color: var(--color-primary); }
.tab-btn:hover { color: var(--color-primary); }
.tab-content { display: none; }
.tab-content.active { display: block; animation: fadeIn 0.5s ease-in-out; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* --- Forms --- */
.form { display: flex; flex-direction: column; gap: 1.25rem; }
.form-input {
    width: 95%;
    padding: 0.75rem 1rem;
    font-size: 1rem; /* Prevents iOS zoom */
    background-color: var(--bg-light);
    border: 1px solid var(--border-light);
    border-radius: 0.5rem;
    transition: border-color var(--transition-speed), box-shadow var(--transition-speed), background-color var(--transition-speed);
    color: var(--text-light); /* Ensure text color is set */
}
html.dark .form-input {
    background-color: var(--bg-dark);
}
.form-input::placeholder {
    color: var(--text-muted-light);
}
html.dark .form-input::placeholder {
    color: var(--text-muted-dark);
}
.form-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(13, 110, 253, 0.25);
}
.form-input.is-invalid { border-color: var(--color-danger); }
fieldset { border: none; padding: 0; margin: 0; }
legend { font-size: 0.875rem; font-weight: 500; margin-bottom: 0.5rem; color: var(--text-light); }
.checkbox-grid { display: grid; grid-template-columns: 1fr; gap: 1rem; }
@media (min-width: 540px) {
    .checkbox-grid { grid-template-columns: repeat(2, 1fr); }
}
.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    padding: 0.25rem 0;
    color: var(--text-light);
    font-size: 0.9rem;
}
.checkbox {
    height: 1.25rem;
    width: 1.25rem;
    accent-color: var(--color-primary);
    flex-shrink: 0;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    border: none;
    border-radius: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    color: rgb(201, 196, 30);
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    overflow: hidden;
    min-height: 44px;
}
.btn:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.btn:active { transform: translateY(-1px); }
.btn-primary { background: linear-gradient(45deg, var(--color-primary), var(--color-primary-light)); }
.btn-success { background: linear-gradient(45deg, var(--color-success), #20c997); }
.btn-warning { color: #111; background: linear-gradient(45deg, var(--color-warning), #ffda6a); }
.btn-indigo { background: linear-gradient(45deg, var(--color-indigo), #8540f5); }
.btn-secondary { background: linear-gradient(45deg, var(--color-secondary), #868e96); }

.btn .btn-text { transition: opacity 0.2s; }
.btn .spinner {
    position: absolute; height: 1.2em; width: 1.2em; border: 2px solid rgba(255, 255, 255, 0.5);
    border-top-color: white; border-radius: 50%; animation: spin 0.8s linear infinite;
    opacity: 0; transition: opacity 0.2s;
}
.btn.loading .btn-text { opacity: 0; }
.btn.loading .spinner { opacity: 1; }
@keyframes spin { to { transform: rotate(360deg); } }

/* --- Output Section --- */
.output-section { margin-top: 3rem; }
.output-area {
    background-color: var(--bg-light); border-radius: 0.5rem; padding: 1.5rem; max-height: 50vh; overflow-y: auto;
    white-space: pre-wrap; font-family: var(--font-mono); font-size: 0.875rem; color: var(--text-muted-light);
    border: 1px solid var(--border-light); box-shadow: inset 0 2px 4px rgba(0,0,0,0.05);
}
.output-actions { display: flex; flex-direction: column; gap: 1rem; }
@media (min-width: 640px) { .output-actions { flex-direction: row; } }
.output-actions .btn { flex: 1; }

/* --- How-to-Use & FAQ --- */
.info-section { margin-top: 5rem; text-align: center; }
.info-grid { display: grid; gap: 2rem; margin-top: 3rem; }
@media (min-width: 768px) { .info-grid { grid-template-columns: repeat(3, 1fr); } }
.info-grid .card { transition: transform 0.3s, box-shadow 0.3s; }
.info-grid .card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }

.faq-list {
    display: flex; flex-direction: column; gap: 1rem;
    max-width: 800px; margin: 3rem auto 0; text-align: left;
}
.faq-item .faq-question {
    width: 100%; display: flex; justify-content: space-between; align-items: center;
    text-align: left; padding: 1rem; font-weight: 600; background: none; border: none; cursor: pointer;
    color: var(--text-light);
}
.faq-item .material-symbols-outlined { transition: transform var(--transition-speed); }
.faq-item.open .material-symbols-outlined { transform: rotate(180deg); }
.faq-answer {
    overflow: hidden; max-height: 0;
    transition: max-height 0.4s ease-in-out, padding 0.4s ease-in-out;
    padding: 0 1rem; color: var(--text-muted-light);
}

/* --- Footer --- */
.site-footer {
    text-align: center; padding: 2rem 0; margin-top: 5rem;
    border-top: 1px solid var(--border-light);
}
.site-footer p { margin: 0; }
.site-footer .disclaimer { font-size: 0.875rem; color: var(--text-muted-light); margin-top: 0.5rem; }

/* --- Notification Modal --- */
.notification-modal {
    position: fixed; top: 1.25rem; right: 1.25rem; background-color: var(--color-success); color: white;
    padding: 0.75rem 1.25rem; border-radius: 0.5rem; box-shadow: var(--shadow-lg);
    transition: transform var(--transition-speed) ease-in-out;
    transform: translateX(150%); z-index: 100;
}
.notification-modal.is-invalid { background-color: var(--color-danger); }
.notification-modal.is-visible { transform: translateX(0); }

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

/* Custom scrollbar */
.custom-scrollbar::-webkit-scrollbar { width: 8px; }
.custom-scrollbar::-webkit-scrollbar-track { background: #e9ecef; }
.custom-scrollbar::-webkit-scrollbar-thumb { background: #adb5bd; border-radius: 4px; }
html.dark .custom-scrollbar::-webkit-scrollbar-track { background: #374151; }
html.dark .custom-scrollbar::-webkit-scrollbar-thumb { background: #6b7280; }