/* Password Mint - Premium Design System
   Inspired by Apple, Linear, Stripe — calm, confident, intentional */

/* =========================================================================
   CSS Reset & Base
   ========================================================================= */

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    /* Primary Colors - Warmer mint */
    --primary: #34d399;
    --primary-dark: #10b981;
    --primary-light: #ecfdf5;
    --primary-glow: rgba(52, 211, 153, 0.15);

    /* Neutral Palette */
    --gray-50: #fafafa;
    --gray-100: #f4f4f5;
    --gray-200: #e4e4e7;
    --gray-300: #d4d4d8;
    --gray-400: #a1a1aa;
    --gray-500: #71717a;
    --gray-600: #52525b;
    --gray-700: #3f3f46;
    --gray-800: #27272a;
    --gray-900: #18181b;

    /* Semantic Colors */
    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;

    /* Spacing Scale */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', 'Fira Mono', Menlo, Monaco, Consolas, monospace;

    /* Shadows - Subtle and refined */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.05), 0 2px 4px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.06), 0 4px 8px rgba(0, 0, 0, 0.04);
    --shadow-glow: 0 0 0 3px var(--primary-glow);

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 120ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body {
    font-family: var(--font-sans);
    background: linear-gradient(180deg, #ffffff 0%, var(--gray-50) 100%);
    color: var(--gray-800);
    line-height: 1.6;
    min-height: 100vh;
    padding: var(--space-4);
}

/* =========================================================================
   Layout
   ========================================================================= */

.container {
    max-width: 480px;
    margin: 0 auto;
    padding-bottom: var(--space-8);
}

/* =========================================================================
   Page Load Animations
   ========================================================================= */

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.trust-bar { animation: fadeUp 0.5s ease 0.05s both; }
.header { animation: fadeUp 0.5s ease 0.1s both; }
.card { animation: fadeUp 0.5s ease 0.15s both; }
.accordion { animation: fadeUp 0.5s ease 0.2s both; }
.tips-section { animation: fadeUp 0.5s ease 0.25s both; }
.faq-link { animation: fadeUp 0.5s ease 0.3s both; }
.footer { animation: fadeUp 0.5s ease 0.35s both; }

/* =========================================================================
   Trust Bar
   ========================================================================= */

.trust-bar {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-4) var(--space-6);
    padding: var(--space-4) var(--space-2);
    margin-bottom: var(--space-6);
}

.trust-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--gray-500);
    white-space: nowrap;
}

.trust-icon {
    width: 16px;
    height: 16px;
    stroke: var(--primary-dark);
    flex-shrink: 0;
}

/* =========================================================================
   Header
   ========================================================================= */

.header {
    text-align: center;
    margin-bottom: var(--space-6);
}

.logo {
    font-size: 1.625rem;
    font-weight: 600;
    color: var(--gray-900);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    letter-spacing: -0.025em;
}

.logo-icon {
    font-size: 1.375rem;
}

.tagline {
    color: var(--gray-400);
    font-size: 0.9375rem;
    margin-top: var(--space-1);
    letter-spacing: -0.01em;
}

/* =========================================================================
   Main Card
   ========================================================================= */

.card {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--gray-100);
    margin-bottom: var(--space-6);
}

/* =========================================================================
   Form Elements
   ========================================================================= */

.form-group {
    margin-bottom: var(--space-5);
}

.form-group-primary {
    margin-bottom: var(--space-5);
}

.form-group > label,
.form-group-primary > label {
    display: block;
    font-weight: 500;
    font-size: 0.875rem;
    color: var(--gray-700);
    margin-bottom: var(--space-2);
}

/* Inputs */
input[type="text"],
input[type="password"],
input[type="number"],
select {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    border: 1.5px solid var(--gray-200);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: inherit;
    color: var(--gray-800);
    background: white;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

input[type="text"]:hover,
input[type="password"]:hover,
input[type="number"]:hover,
select:hover {
    border-color: var(--gray-300);
}

input[type="text"]:focus,
input[type="password"]:focus,
input[type="number"]:focus,
select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: var(--shadow-glow);
}

input::placeholder {
    color: var(--gray-400);
}

input[type="number"] {
    width: 80px;
}

select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2371717a' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 40px;
}

/* Input with Toggle */
.input-with-toggle {
    position: relative;
    display: flex;
}

.input-with-toggle input {
    padding-right: 48px;
}

.toggle-visibility {
    position: absolute;
    right: var(--space-3);
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-1);
    color: var(--gray-400);
    transition: color var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.toggle-visibility:hover {
    color: var(--gray-600);
}

.toggle-visibility .eye-icon {
    width: 20px;
    height: 20px;
}

/* Hints */
.hint {
    display: block;
    margin-top: var(--space-2);
    font-size: 0.75rem;
    color: var(--gray-400);
    line-height: 1.5;
}

/* Field Errors */
.field-error {
    display: none;
    margin-top: var(--space-2);
    font-size: 0.75rem;
    color: var(--danger);
    line-height: 1.5;
}

.field-error:not(:empty) {
    display: block;
}

/* Error State for Inputs */
input.is-error,
input.is-error:hover {
    border-color: var(--danger);
    background-color: #fef2f2;
}

input.is-error:focus {
    border-color: var(--danger);
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15);
}

/* Version Input Wrapper */
.version-input-wrapper {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.version-input-wrapper .hint {
    margin-top: 0;
}

/* =========================================================================
   Buttons
   ========================================================================= */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.btn svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

/* Primary Button */
.btn-primary {
    background: var(--gray-900);
    color: white;
    position: relative;
}

.btn-primary:hover {
    background: var(--gray-800);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-primary:active {
    transform: translateY(0);
    box-shadow: none;
}

.btn-large {
    width: 100%;
    padding: var(--space-4) var(--space-6);
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-lg);
    margin-top: var(--space-2);
    margin-bottom: var(--space-4);
}

/* Button Loading State */
.btn-primary.loading .btn-text {
    opacity: 0;
}

.btn-primary .btn-loader {
    display: none;
}

.btn-primary.loading .btn-loader {
    display: block;
    position: absolute;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Ghost Button */
.btn-ghost {
    background: transparent;
    color: var(--gray-500);
    padding: var(--space-2) var(--space-3);
}

.btn-ghost:hover {
    background: var(--gray-100);
    color: var(--gray-700);
}

.btn-small {
    padding: var(--space-1) var(--space-2);
    font-size: 0.75rem;
}

/* Copy Button */
.btn-copy {
    width: 100%;
    padding: var(--space-4);
    background: var(--primary);
    color: white;
    font-size: 0.9375rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    margin-top: var(--space-4);
}

.btn-copy:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-copy.copied {
    background: var(--gray-800);
}

.btn-copy .copy-icon {
    width: 18px;
    height: 18px;
}

/* =========================================================================
   Advanced Options (Collapsible)
   ========================================================================= */

.advanced-options {
    border-top: 1px solid var(--gray-100);
    padding-top: var(--space-4);
    margin-top: var(--space-2);
}

.advanced-options summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--gray-500);
    cursor: pointer;
    padding: var(--space-2) 0;
    list-style: none;
    transition: color var(--transition-fast);
}

.advanced-options summary::-webkit-details-marker {
    display: none;
}

.advanced-options summary:hover {
    color: var(--gray-700);
}

.advanced-options .chevron-icon {
    width: 16px;
    height: 16px;
    transition: transform var(--transition-base);
}

.advanced-options[open] .chevron-icon {
    transform: rotate(180deg);
}

.advanced-options-content {
    padding-top: var(--space-5);
}

/* Remember Section */
.remember-section {
    padding: var(--space-4);
    background: var(--gray-50);
    border-radius: var(--radius-md);
    border: 1px solid var(--gray-100);
}

.warning-box {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: var(--space-3);
    padding: var(--space-3);
    background: #fef3c7;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    color: var(--gray-700);
}

/* =========================================================================
   Toggle Grid & Checkboxes
   ========================================================================= */

.toggle-grid {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 0.8125rem;
    color: var(--gray-600);
    cursor: pointer;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-sm);
    border: 1px solid var(--gray-200);
    transition: all var(--transition-fast);
    user-select: none;
}

.checkbox-label:hover {
    border-color: var(--gray-300);
    background: var(--gray-50);
}

.checkbox-label:has(input:checked) {
    border-color: var(--primary);
    background: var(--primary-light);
    color: var(--primary-dark);
}

.checkbox-label input[type="checkbox"] {
    width: 14px;
    height: 14px;
    accent-color: var(--primary);
    cursor: pointer;
    margin: 0;
}

/* =========================================================================
   Range Slider
   ========================================================================= */

.range-wrapper {
    position: relative;
}

input[type="range"] {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--gray-200);
    appearance: none;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: white;
    border: 2px solid var(--primary);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-md);
}

input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: white;
    border: 2px solid var(--primary);
    cursor: pointer;
}

.range-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.6875rem;
    color: var(--gray-400);
    margin-top: var(--space-1);
}

/* =========================================================================
   Output Section
   ========================================================================= */

.output-section {
    margin-top: var(--space-6);
    padding-top: var(--space-6);
    border-top: 1px solid var(--gray-100);
    animation: fadeUp 0.4s ease;
}

.output-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    color: var(--success);
    font-weight: 600;
    font-size: 0.875rem;
    margin-bottom: var(--space-4);
}

.output-icon {
    width: 20px;
    height: 20px;
}

.output-password-wrapper {
    position: relative;
    display: flex;
}

.output-password-wrapper input {
    width: 100%;
    padding: var(--space-4);
    padding-right: 52px;
    background: var(--gray-900);
    color: var(--primary);
    border: none;
    border-radius: var(--radius-lg);
    font-family: var(--font-mono);
    font-size: 1rem;
    letter-spacing: 1px;
    text-align: center;
}

.output-password-wrapper input[type="password"] {
    letter-spacing: 4px;
}

.output-password-wrapper input:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(52, 211, 153, 0.2);
}

/* Toggle visibility button in output */
.toggle-output-visibility {
    position: absolute;
    right: var(--space-3);
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-2);
    color: var(--gray-400);
    transition: color var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    min-height: 44px;
}

.toggle-output-visibility:hover {
    color: var(--primary);
}

.toggle-output-visibility .eye-icon {
    width: 20px;
    height: 20px;
}

.output-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--space-4);
    font-size: 0.75rem;
    color: var(--gray-400);
}

.normalized-site code {
    font-family: var(--font-mono);
    background: var(--gray-100);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    color: var(--gray-600);
}

.output-actions {
    display: flex;
    justify-content: center;
    gap: var(--space-2);
    margin-top: var(--space-4);
}

.output-actions .btn svg {
    width: 14px;
    height: 14px;
}

/* =========================================================================
   Accordion
   ========================================================================= */

.accordion {
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-100);
    margin-bottom: var(--space-4);
    overflow: hidden;
}

.accordion-header {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-4) var(--space-5);
    background: white;
    border: none;
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--gray-800);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.accordion-header:hover {
    background: var(--gray-50);
}

.accordion-icon {
    font-size: 0.75rem;
    color: var(--gray-400);
    transition: transform var(--transition-base);
}

.accordion-header[aria-expanded="true"] .accordion-icon {
    transform: rotate(180deg);
}

.accordion-content {
    display: none;
    border-top: 1px solid var(--gray-100);
}

.accordion-content.open {
    display: block;
}

.accordion-inner {
    padding: var(--space-5);
}

.accordion-inner h3 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: var(--space-2);
    margin-top: var(--space-4);
}

.accordion-inner h3:first-child {
    margin-top: 0;
}

.accordion-inner p {
    font-size: 0.8125rem;
    color: var(--gray-500);
    margin-bottom: var(--space-4);
    line-height: 1.7;
}

.accordion-inner ol {
    font-size: 0.8125rem;
    color: var(--gray-500);
    padding-left: var(--space-5);
    margin-bottom: var(--space-4);
    line-height: 1.7;
}

.accordion-inner li {
    margin-bottom: var(--space-2);
}

.accordion-inner strong {
    color: var(--gray-700);
    font-weight: 500;
}

/* FAQ Items */
.faq-item {
    margin-bottom: var(--space-4);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--gray-100);
}

.faq-item:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.faq-item h3 {
    margin-top: 0;
    margin-bottom: var(--space-2);
}

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

/* =========================================================================
   Tips Section
   ========================================================================= */

.tips-section {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-100);
    margin-bottom: var(--space-4);
}

.tips-section h2 {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: var(--space-4);
}

.tips-list {
    list-style: none;
}

.tips-list li {
    position: relative;
    padding-left: var(--space-5);
    margin-bottom: var(--space-3);
    font-size: 0.8125rem;
    color: var(--gray-500);
    line-height: 1.6;
}

.tips-list li:last-child {
    margin-bottom: 0;
}

.tips-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 8px;
    width: 6px;
    height: 6px;
    background: var(--primary);
    border-radius: 50%;
}

.tips-list strong {
    color: var(--gray-700);
    font-weight: 500;
}

/* =========================================================================
   FAQ Link
   ========================================================================= */

.faq-link {
    text-align: center;
    margin-bottom: var(--space-4);
}

.faq-link a {
    color: var(--gray-500);
    font-size: 0.8125rem;
    font-weight: 500;
    text-decoration: none;
    transition: color var(--transition-fast);
}

.faq-link a:hover {
    color: var(--primary-dark);
}

/* =========================================================================
   Footer
   ========================================================================= */

.footer {
    text-align: center;
    padding: var(--space-4) 0;
}

.privacy-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: var(--primary-light);
    border-radius: var(--radius-full);
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--primary-dark);
    margin-bottom: var(--space-4);
}

.privacy-badge svg {
    width: 16px;
    height: 16px;
    stroke: var(--primary-dark);
}

.credits {
    font-size: 0.75rem;
    color: var(--gray-400);
}

.credits a {
    color: var(--gray-500);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.credits a:hover {
    color: var(--primary-dark);
}

.credits .separator {
    margin: 0 var(--space-2);
    color: var(--gray-300);
}

/* =========================================================================
   Responsive Design
   ========================================================================= */

@media (max-width: 480px) {
    body {
        padding: var(--space-3);
    }

    .container {
        max-width: 100%;
    }

    .card {
        padding: var(--space-5);
        border-radius: var(--radius-lg);
    }

    .trust-bar {
        gap: var(--space-3) var(--space-4);
    }

    .trust-item {
        font-size: 0.75rem;
    }

    .logo {
        font-size: 1.5rem;
    }

    .tagline {
        font-size: 0.875rem;
    }

    /* Larger tap targets on mobile */
    .checkbox-label {
        padding: var(--space-3) var(--space-4);
        min-height: 44px;
    }

    input[type="number"] {
        width: 100%;
    }

    .version-input-wrapper {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-2);
    }

    .output-meta {
        flex-direction: column;
        gap: var(--space-2);
        align-items: center;
    }
}

/* =========================================================================
   Focus States (Accessibility)
   ========================================================================= */

:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

button:focus-visible,
a:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* =========================================================================
   Reduced Motion
   ========================================================================= */

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* =========================================================================
   Print Styles
   ========================================================================= */

@media print {
    .trust-bar,
    .advanced-options,
    .output-section,
    .accordion,
    .btn {
        display: none !important;
    }
}