/* ===== Google Fonts ===== */
@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@400;500;600&display=swap');
@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500&display=swap');

/* ===== CSS Tokens ===== */
:root {
    --void: #0B1019;
    --surface: #131A26;
    --border: #1E2736;
    --text: #D9E0EC;
    --muted: #5C6A82;
    --accent: #D9A94E;
    --accent-glow: rgba(217, 169, 78, 0.12);
    --error: #E5534B;
    --success: #57AB5A;
    
    --font-heading: 'Space Grotesk', sans-serif;
    --font-body: 'IBM Plex Sans', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    --radius: 6px;
    --transition-base: 0.2s ease;
    --transition-slow: 0.4s ease;
}

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

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

body {
    font-family: var(--font-body);
    background: var(--void);
    min-height: 100vh;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding: 40px 20px;
    color: var(--text);
    line-height: 1.5;
}

/* ===== Container ===== */
.container {
    width: 100%;
    max-width: 520px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

/* ===== Character Map Container ===== */
.char-map-container {
    background: var(--void);
    border: 1px solid var(--border);
    border-top: 2px solid var(--accent);
    border-radius: var(--radius);
    padding: 14px 16px;
    position: relative;
}

.char-map {
    display: flex;
    flex-wrap: wrap;
    gap: 2px 6px;
    justify-content: center;
}

.char {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    letter-spacing: 0.04em;
    color: var(--muted);
    transition: opacity var(--transition-slow), color var(--transition-base);
    user-select: none;
}

/* Character set toggle states */
.char-map-container.set-digits-off .char.digit,
.char-map-container.set-lower-off .char.lower,
.char-map-container.set-upper-off .char.upper,
.char-map-container.set-special-off .char.special {
    opacity: 0.15;
}

/* ===== Card ===== */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
}

h1 {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    text-align: center;
    margin-bottom: 28px;
    color: var(--text);
}

/* ===== Form Sections ===== */
.form-section {
    margin-bottom: 24px;
}

.form-section:last-of-type {
    margin-bottom: 20px;
}

.section-label {
    display: block;
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--muted);
    margin-bottom: 12px;
}

/* ===== Length Control ===== */
.length-control {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.length-input {
    width: 70px;
    padding: 10px 8px;
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 500;
    text-align: center;
    color: var(--text);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
    -moz-appearance: textfield;
}

.length-input::-webkit-outer-spin-button,
.length-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.length-input:focus-visible {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.length-input:hover {
    border-color: #3a4659;
}

/* Range Slider */
.length-slider {
    width: 100%;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--border);
    border-radius: 3px;
    outline: none;
    cursor: pointer;
}

.length-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.length-slider::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: 0 0 8px var(--accent-glow);
}

.length-slider::-moz-range-thumb {
    width: 16px;
    height: 16px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.length-slider::-moz-range-thumb:hover {
    transform: scale(1.1);
    box-shadow: 0 0 8px var(--accent-glow);
}

.length-slider::-moz-range-progress {
    background: var(--accent);
    height: 6px;
    border-radius: 3px;
}

/* ===== Toggle List ===== */
.toggle-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.toggle-row {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 14px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: border-color var(--transition-base), background var(--transition-base);
    position: relative;
}

.toggle-row:hover {
    border-color: #3a4659;
}

.toggle-row input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
    outline: none;
}

.toggle-indicator {
    width: 16px;
    height: 16px;
    border: 1.5px solid var(--muted);
    border-radius: 3px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: border-color var(--transition-base), background var(--transition-base);
    flex-shrink: 0;
}

.check-icon {
    width: 10px;
    height: 10px;
    color: var(--void);
    opacity: 0;
    transform: scale(0.8);
    transition: opacity var(--transition-base), transform var(--transition-base);
}

.toggle-label {
    font-family: var(--font-body);
    font-size: 0.9375rem;
    color: var(--text);
    user-select: none;
}

.toggle-label .range {
    color: var(--muted);
    margin-left: 4px;
}

/* Checked state */
.toggle-row:has(input:checked) {
    border-color: var(--accent);
    background: var(--accent-glow);
}

.toggle-row:has(input:checked) .toggle-indicator {
    background: var(--accent);
    border-color: var(--accent);
}

.toggle-row:has(input:checked) .check-icon {
    opacity: 1;
    transform: scale(1);
}

/* Focus state */
.toggle-row input:focus-visible + .toggle-indicator {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* ===== Password Output ===== */
.password-output-container {
    margin-bottom: 20px;
}

.password-output-container.has-password .password-display {
    border-top: 2px solid var(--accent);
}

.password-display {
    background: var(--void);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px 16px;
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 2px;
    font-family: var(--font-mono);
    font-size: 1.25rem;
    letter-spacing: 0.08em;
    color: var(--text);
    transition: border-color var(--transition-base);
}

.password-placeholder {
    font-family: var(--font-body);
    font-size: 0.9375rem;
    color: var(--muted);
    letter-spacing: normal;
}

/* Password reveal animation */
.password-char {
    display: inline-block;
    animation: charReveal 0.3s ease forwards;
    opacity: 0;
    transform: translateY(-4px);
}

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

/* ===== Actions ===== */
.actions {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* Generate Button */
.btn-generate {
    width: 100%;
    height: 52px;
    padding: 0 24px;
    font-family: var(--font-heading);
    font-size: 0.9375rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    color: var(--void);
    background: var(--accent);
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: transform var(--transition-base), background var(--transition-base), box-shadow var(--transition-base);
}

.btn-generate:hover {
    background: #e4b85a;
    transform: scale(1.01);
    box-shadow: 0 4px 20px rgba(217, 169, 78, 0.25);
}

.btn-generate:active {
    transform: scale(0.99);
    background: #c99a3f;
}

.btn-generate:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-generate:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
}

/* Copy Button */
.btn-copy {
    width: 100%;
    height: 44px;
    padding: 0 24px;
    font-family: var(--font-body);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text);
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: border-color var(--transition-base), color var(--transition-base), background var(--transition-base);
}

.btn-copy:hover:not(:disabled) {
    border-color: var(--accent);
    color: var(--accent);
}

.btn-copy:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.btn-copy:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* Copied state */
.btn-copy.copied {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-glow);
}

/* ===== Toast ===== */
.toast {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    padding: 14px 24px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-left: 3px solid var(--success);
    border-radius: var(--radius);
    font-family: var(--font-body);
    font-size: 0.875rem;
    color: var(--text);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
    opacity: 0;
    transition: transform 0.3s ease, opacity 0.3s ease;
    z-index: 1000;
    max-width: 90vw;
    word-wrap: break-word;
}

.toast.visible {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.toast.hidden {
    display: none;
}

.toast-success {
    border-left-color: var(--success);
}

.toast-error {
    border-left-color: var(--error);
}

/* ===== Responsive ===== */
@media (max-width: 520px) {
    body {
        padding: 20px 16px;
    }
    
    .char-map-container {
        padding: 12px 14px;
    }
    
    .char {
        font-size: 0.75rem;
    }
    
    .card {
        padding: 22px;
    }
    
    h1 {
        font-size: 1.75rem;
        margin-bottom: 24px;
    }
    
    .password-display {
        font-size: 1.125rem;
        padding: 16px 14px;
    }
}

@media (max-width: 380px) {
    .char-map {
        gap: 1px 4px;
    }

    .char {
        font-size: 0.6875rem;
    }
    
    .card {
        padding: 18px;
    }
    
    h1 {
        font-size: 1.5rem;
    }
    
    .toggle-row {
        padding: 10px 12px;
    }
    
    .toggle-label {
        font-size: 0.875rem;
    }
    
    .toggle-label .range {
        display: none;
    }
    
    .password-display {
        font-size: 1rem;
    }
}

/* ===== Accessibility: Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .password-char {
        animation: none;
        opacity: 1;
        transform: none;
    }
    
    .toast {
        transition: opacity 0.15s ease;
    }
}

/* ===== Print Styles ===== */
@media print {
    body {
        background: white;
        padding: 20px;
    }
    
    .char-map-container,
    .form-section,
    .actions {
        display: none;
    }
    
    .card {
        background: white;
        border: 1px solid #ccc;
        box-shadow: none;
    }
    
    .password-output-container {
        display: block !important;
    }
    
    .password-display {
        background: #f5f5f5;
        border: 1px solid #ccc;
        color: black;
    }
    
    h1 {
        color: black;
    }
}