/* ============================================================
   DESIGN TOKENS
============================================================ */
:root {
    /* Accent — overridden per theme */
    --accent:      #5B8DB8;
    --accent-dark: #3d6d96;

    /* Neutral palette — light mode */
    --bg:          #F5F4F1;
    --surface:     #FFFFFF;
    --surface-2:   #EFEEEB;
    --border:      rgba(0, 0, 0, 0.08);
    --text:        #1B1A18;
    --text-2:      #706E69;
    --toggle-off:  #D0CEC9;

    /* Strength */
    --c-weak:         #D95F5F;
    --c-medium:       #D4902A;
    --c-strong:       #4FAD4F;
    --c-very-strong:  #3A8A3A;

    /* Shape */
    --radius:    14px;
    --radius-sm: 9px;
    --radius-xs: 6px;

    /* Typography */
    --font:      'DM Sans', system-ui, sans-serif;
    --font-head: 'Space Grotesk', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;

    /* Transition */
    --t: 0.18s ease;

    /* Legacy compat — script.js reads --primary-color */
    --primary-color: var(--accent);
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg:        #131211;
        --surface:   #1D1C1A;
        --surface-2: #252421;
        --border:    rgba(255, 255, 255, 0.07);
        --text:      #ECEAE6;
        --text-2:    #8A8780;
        --toggle-off: #3A3936;
    }
}

/* ============================================================
   THEMES — accent color only
============================================================ */
[data-theme="pastel-blue"]   { --accent: #5B8DB8; --accent-dark: #3d6d96; --primary-color: #5B8DB8; }
[data-theme="pastel-pink"]   { --accent: #D47878; --accent-dark: #b55c5c; --primary-color: #D47878; }
[data-theme="pastel-green"]  { --accent: #58AD58; --accent-dark: #3e8e3e; --primary-color: #58AD58; }
[data-theme="pastel-purple"] { --accent: #8B74A0; --accent-dark: #6e5882; --primary-color: #8B74A0; }
[data-theme="pastel-yellow"] { --accent: #C0992A; --accent-dark: #a07818; --primary-color: #C0992A; }
[data-theme="pastel-peach"]  { --accent: #D07268; --accent-dark: #ae5850; --primary-color: #D07268; }

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

html {
    color-scheme: light dark;
}

body {
    font-family: var(--font);
    font-size: 15px;
    color: var(--text);
    background: var(--bg);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background var(--t), color var(--t);
}

/* ============================================================
   LAYOUT
============================================================ */
#app {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: clamp(1.5rem, 5vw, 3rem) 1.25rem clamp(2rem, 6vw, 4rem);
}

.container {
    width: 100%;
    max-width: 520px;
    display: flex;
    flex-direction: column;
    gap: 0.875rem;
}

/* ============================================================
   HEADER
============================================================ */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0 0.125rem 0.375rem;
}

.app-title {
    display: flex;
    align-items: center;
    gap: 0.625rem;
}

.lock-icon {
    color: var(--accent);
    flex-shrink: 0;
    transition: color var(--t);
}

.app-title h1 {
    font-family: var(--font-head);
    font-size: clamp(1.15rem, 3.5vw, 1.35rem);
    font-weight: 700;
    color: var(--text);
    line-height: 1.1;
    letter-spacing: -0.025em;
}

.subtitle {
    font-size: 0.76rem;
    color: var(--text-2);
    margin-top: 2px;
    letter-spacing: 0.01em;
}

/* Theme dots */
.theme-options {
    display: flex;
    gap: 7px;
    align-items: center;
}

.theme-btn {
    width: 19px;
    height: 19px;
    border-radius: 50%;
    border: 2px solid transparent;
    cursor: pointer;
    outline: none;
    transition: transform var(--t), box-shadow var(--t);
    flex-shrink: 0;
}

.theme-btn:hover { transform: scale(1.2); }

.theme-btn.active {
    box-shadow: 0 0 0 2px var(--bg), 0 0 0 3.5px var(--text);
}

.theme-btn[data-theme="pastel-blue"]   { background: #7BAFD4; }
.theme-btn[data-theme="pastel-pink"]   { background: #EFA8A8; }
.theme-btn[data-theme="pastel-green"]  { background: #7ECC7E; }
.theme-btn[data-theme="pastel-purple"] { background: #B39BC8; }
.theme-btn[data-theme="pastel-yellow"] { background: #F5D060; }
.theme-btn[data-theme="pastel-peach"]  { background: #F0A898; }

/* ============================================================
   OUTPUT SECTION
============================================================ */
.output-section {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.375rem 1.375rem 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
}

/* Password field */
.password-display-container {
    display: flex;
    width: 100%;
    gap: 0.5rem;
    align-items: stretch;
}

#password-output {
    flex: 1;
    min-width: 0;
    font-family: var(--font-mono);
    font-size: clamp(0.82rem, 2.2vw, 0.95rem);
    color: var(--text);
    background: var(--surface-2);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.7rem 0.875rem;
    letter-spacing: 0.05em;
    cursor: default;
    outline: none;
    transition: border-color var(--t);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

#password-output::placeholder {
    color: var(--text-2);
    font-style: normal;
    letter-spacing: 0;
    font-family: var(--font);
    font-size: 0.87rem;
}

#password-output:focus {
    border-color: var(--accent);
}

#copy-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    flex-shrink: 0;
    background: transparent;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-2);
    cursor: pointer;
    transition: color var(--t), border-color var(--t), background var(--t);
}

#copy-btn:hover {
    color: var(--accent);
    border-color: var(--accent);
    background: color-mix(in srgb, var(--accent) 8%, transparent);
}

/* Strength row */
.strength-row {
    display: flex;
    align-items: center;
    gap: 0.875rem;
    width: 100%;
}

.strength-bar-bg {
    flex: 1;
    height: 3px;
    background: var(--surface-2);
    border-radius: 2px;
    overflow: hidden;
}

.strength-bar-fill {
    height: 100%;
    width: 0%;
    border-radius: 2px;
    background: var(--c-weak);
    transition: width 0.45s cubic-bezier(0.4, 0, 0.2, 1),
                background-color 0.35s ease;
}

.strength-weak       { background-color: var(--c-weak) !important; }
.strength-medium     { background-color: var(--c-medium) !important; }
.strength-strong     { background-color: var(--c-strong) !important; }
.strength-very-strong { background-color: var(--c-very-strong) !important; }

.strength-label {
    font-size: 0.74rem;
    color: var(--text-2);
    white-space: nowrap;
    flex-shrink: 0;
}

.strength-label strong {
    color: var(--text);
    font-weight: 600;
}

/* QR code */
.qrcode-box {
    background: #fff;
    border-radius: var(--radius-sm);
    padding: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    align-self: center;
}

.qrcode-box:empty {
    display: none;
}

/* ============================================================
   CONTROLS SECTION
============================================================ */
.controls-section {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.control-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.9rem 1.375rem;
}

.control-row--top {
    align-items: flex-start;
}

.section-divider {
    height: 1px;
    background: var(--border);
}

.control-label {
    font-size: 0.73rem;
    font-weight: 600;
    color: var(--text-2);
    text-transform: uppercase;
    letter-spacing: 0.07em;
    min-width: 58px;
    flex-shrink: 0;
    padding-top: 3px;
}

/* Length slider */
.length-input-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex: 1;
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    flex: 1;
    height: 3px;
    background: var(--surface-2);
    border-radius: 2px;
    cursor: pointer;
    outline: none;
    accent-color: var(--accent);
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
    transition: background var(--t), transform var(--t);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.15);
}

input[type="range"]::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    border: none;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
}

input[type="number"] {
    width: 50px;
    padding: 0.3rem 0.375rem;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    text-align: center;
    background: var(--surface-2);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-xs);
    color: var(--text);
    outline: none;
    transition: border-color var(--t);
    -moz-appearance: textfield;
}

input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
    -webkit-appearance: none;
}

input[type="number"]:focus {
    border-color: var(--accent);
}

/* Toggle switches */
.options-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.55rem 1.25rem;
    flex: 1;
}

.toggle-control {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    user-select: none;
    position: relative;
    transition: opacity var(--t);
}

.toggle-control--wide {
    grid-column: span 2;
}

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

.toggle-track {
    position: relative;
    display: inline-flex;
    width: 33px;
    height: 18px;
    background: var(--toggle-off);
    border-radius: 9px;
    flex-shrink: 0;
    transition: background var(--t);
}

.toggle-thumb {
    position: absolute;
    top: 2px;
    left: 2px;
    width: 14px;
    height: 14px;
    background: #fff;
    border-radius: 50%;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.18);
    transition: transform var(--t);
}

.toggle-control input:checked + .toggle-track {
    background: var(--accent);
}

.toggle-control input:checked + .toggle-track .toggle-thumb {
    transform: translateX(15px);
}

.toggle-control:focus-within .toggle-track {
    box-shadow: 0 0 0 2px var(--bg), 0 0 0 3.5px var(--accent);
}

.toggle-control:has(input:disabled) {
    opacity: 0.38;
    pointer-events: none;
    cursor: default;
}

.toggle-text {
    font-size: 0.84rem;
    font-weight: 500;
    color: var(--text);
}

/* Mode selector */
.mode-selector {
    display: flex;
    gap: 0.375rem;
    flex: 1;
    flex-wrap: wrap;
}

.mode-selector input[type="radio"] {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.radio-label {
    padding: 0.3rem 0.7rem;
    border: 1.5px solid var(--border);
    border-radius: 99px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-2);
    cursor: pointer;
    transition: all var(--t);
    background: transparent;
}

.radio-label:hover {
    color: var(--text);
    border-color: var(--text-2);
}

.mode-selector input[type="radio"]:checked + .radio-label {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

/* ============================================================
   GENERATE BUTTON
============================================================ */
.primary-btn {
    width: 100%;
    padding: 0.875rem 1rem;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: var(--radius);
    font-family: var(--font-head);
    font-size: 0.95rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    cursor: pointer;
    transition: background var(--t), transform 0.1s ease;
}

.primary-btn:hover {
    background: var(--accent-dark);
}

.primary-btn:active {
    transform: scale(0.985);
}

/* ============================================================
   HISTORY
============================================================ */
.history-section {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

.history-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    padding: 0.875rem 1.375rem;
    border-bottom: 1px solid var(--border);
}

.history-header h2 {
    font-family: var(--font-head);
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--text);
    letter-spacing: 0.02em;
    text-transform: uppercase;
}

.export-actions {
    display: flex;
    gap: 0.375rem;
}

.sm-btn {
    padding: 0.22rem 0.55rem;
    font-size: 0.73rem;
    font-weight: 500;
    border: 1.5px solid var(--border);
    border-radius: 99px;
    background: transparent;
    color: var(--text-2);
    cursor: pointer;
    transition: all var(--t);
    font-family: var(--font);
}

.sm-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.sm-btn.danger {
    color: var(--c-weak);
    border-color: transparent;
}

.sm-btn.danger:hover {
    background: var(--c-weak);
    border-color: var(--c-weak);
    color: #fff;
}

.history-list {
    list-style: none;
    max-height: 260px;
    overflow-y: auto;
    padding: 0.375rem 0;
}

.history-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    padding: 0.55rem 1.375rem;
    cursor: pointer;
    transition: background var(--t);
}

.history-item:hover {
    background: var(--surface-2);
}

.history-pass {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex: 1;
    min-width: 0;
}

.history-time {
    font-size: 0.71rem;
    color: var(--text-2);
    white-space: nowrap;
    flex-shrink: 0;
}

/* ============================================================
   UTILITIES
============================================================ */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* ============================================================
   RESPONSIVE
============================================================ */
@media (max-width: 480px) {
    .app-header {
        flex-wrap: wrap;
        gap: 0.75rem;
    }

    .control-row {
        flex-wrap: wrap;
        padding: 0.875rem 1.125rem;
    }

    .control-label {
        min-width: unset;
        width: 100%;
    }

    .length-input-container,
    .options-grid,
    .mode-selector {
        width: 100%;
    }

    .output-section {
        padding: 1.125rem;
    }

    .history-item {
        padding: 0.55rem 1.125rem;
    }

    .history-header {
        padding: 0.875rem 1.125rem;
    }
}