/* ── Dark theme (default) ── */
:root {
    --bg-color:       #0c0c0c;
    --surface-color:  #111111;
    --text-color:     #33ff00;
    --border-color:   #33ff00;
    --hover-bg:       #1a4d1a;
    --dim-text:       #1b8a1b;
    --glow:           rgba(51, 255, 0, 0.25);
    --glow-strong:    rgba(51, 255, 0, 0.5);
    --cursor-color:   #33ff00;
    --scanline:       rgba(0, 0, 0, 0.15);
}

/* ── Light theme ── */
body.light {
    --bg-color:       #f0ede6;
    --surface-color:  #faf8f4;
    --text-color:     #1a3a1a;
    --border-color:   #2d6a2d;
    --hover-bg:       #d4e8d4;
    --dim-text:       #5a7a5a;
    --glow:           rgba(45, 106, 45, 0.15);
    --glow-strong:    rgba(45, 106, 45, 0.35);
    --cursor-color:   #1a3a1a;
    --scanline:       rgba(0, 0, 0, 0.04);
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Courier New', Courier, monospace;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
    transition: background-color 0.3s, color 0.3s;

    /* CRT scanline overlay */
    background-image: repeating-linear-gradient(
        0deg,
        var(--scanline) 0px,
        var(--scanline) 1px,
        transparent 1px,
        transparent 3px
    );
}

.container {
    width: 100%;
    max-width: 620px;
    border: 1px solid var(--border-color);
    padding: 24px;
    background-color: var(--surface-color);
    box-shadow:
        0 0 0 1px var(--border-color),
        0 0 20px var(--glow),
        0 0 60px var(--glow);
    transition: background-color 0.3s, box-shadow 0.3s, border-color 0.3s;
}

/* ── Header ── */
header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 24px;
    border-bottom: 1px dashed var(--border-color);
    padding-bottom: 12px;
}

.header-text h1 {
    font-size: 1.4rem;
    text-transform: uppercase;
    letter-spacing: 3px;
}

.header-text h1::after {
    content: '';
    display: inline-block;
    width: 10px;
    height: 1.1em;
    background: var(--cursor-color);
    margin-left: 4px;
    vertical-align: text-bottom;
    animation: blink-cursor 1s step-end infinite;
}

@keyframes blink-cursor {
    0%, 100% { opacity: 1; }
    50%       { opacity: 0; }
}

.subtitle {
    color: var(--dim-text);
    font-size: 0.8rem;
    margin-top: 4px;
    letter-spacing: 1px;
}

/* ── Theme toggle ── */
.theme-toggle {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.75rem;
    color: var(--dim-text);
    user-select: none;
}

.theme-toggle span {
    letter-spacing: 1px;
}

.toggle-track {
    position: relative;
    width: 40px;
    height: 20px;
    border: 1px solid var(--border-color);
    cursor: pointer;
    background: transparent;
    transition: background 0.2s;
}

.toggle-track::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 14px;
    height: 14px;
    background: var(--text-color);
    transition: transform 0.2s, background 0.2s;
}

body.light .toggle-track::after {
    transform: translateX(20px);
}

/* ── Password output ── */
.output-group {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 20px;
}

#password-output {
    flex-grow: 1;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 10px 12px;
    font-family: inherit;
    font-size: 1.1rem;
    outline: none;
    letter-spacing: 1px;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: background 0.3s, color 0.3s, border-color 0.3s;
}

#password-output:focus {
    box-shadow: 0 0 8px var(--glow-strong);
}

/* ── Buttons ── */
button {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 10px 14px;
    cursor: pointer;
    font-family: inherit;
    font-weight: bold;
    font-size: 0.8rem;
    letter-spacing: 1px;
    transition: all 0.15s;
}

button:hover {
    background: var(--hover-bg);
    box-shadow: 0 0 8px var(--glow-strong);
}

button:active {
    opacity: 0.7;
}

/* ── Tabs ── */
.tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0;
}

.tab-btn {
    border: 1px solid transparent;
    border-bottom: none;
    padding: 6px 16px;
    font-size: 0.8rem;
    letter-spacing: 1px;
    transition: all 0.15s;
}

.tab-btn:hover:not(.tab-disabled):not(.active) {
    border-color: var(--dim-text);
    background: var(--hover-bg);
    box-shadow: none;
}

.tab-btn.active {
    background: var(--text-color);
    color: var(--bg-color);
    border-color: var(--border-color);
}

.tab-btn.tab-disabled {
    color: var(--dim-text);
    cursor: not-allowed;
    opacity: 0.4;
}

/* ── Tab content ── */
.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fade-in 0.15s ease;
}

@keyframes fade-in {
    from { opacity: 0; transform: translateY(4px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ── Settings ── */
.setting {
    margin-bottom: 14px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.setting label {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    font-size: 0.9rem;
}

.setting > p {
    font-size: 0.85rem;
    color: var(--dim-text);
    margin-bottom: 8px;
}

.word-separator-setting {
    padding-left: 20px;
    border-left: 2px solid var(--dim-text);
    margin-left: 4px;
}

/* ── Range slider ── */
input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    background: transparent;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    height: 16px;
    width: 16px;
    background: var(--text-color);
    cursor: pointer;
    margin-top: -6px;
    box-shadow: 0 0 4px var(--glow-strong);
}

input[type="range"]::-webkit-slider-runnable-track {
    width: 100%;
    height: 4px;
    cursor: pointer;
    background: var(--dim-text);
}

/* ── Checkbox ── */
input[type="checkbox"] {
    accent-color: var(--text-color);
    width: 15px;
    height: 15px;
    outline: 1px solid var(--border-color);
    cursor: pointer;
    flex-shrink: 0;
}

/* ── Text inputs ── */
input[type="text"] {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 8px 10px;
    font-family: inherit;
    font-size: 0.9rem;
    outline: none;
    width: 100%;
    transition: background 0.3s, color 0.3s;
}

input[type="text"]:focus {
    box-shadow: 0 0 6px var(--glow-strong);
}

/* ── Coming soon banner ── */
.coming-soon-banner {
    margin-top: 24px;
    padding: 8px 14px;
    border: 1px dashed var(--dim-text);
    color: var(--dim-text);
    font-size: 0.75rem;
    text-align: center;
    letter-spacing: 0.5px;
    animation: blink-border 2.5s step-end infinite;
}

@keyframes blink-border {
    0%, 100% { border-color: var(--dim-text); opacity: 1; }
    50%       { border-color: transparent;    opacity: 0.6; }
}

/* ── Footer ── */
footer {
    margin-top: 14px;
    padding-top: 10px;
    border-top: 1px dashed var(--border-color);
    text-align: center;
    font-size: 0.75rem;
    color: var(--dim-text);
    letter-spacing: 1px;
}

footer a {
    color: var(--text-color);
    text-decoration: none;
}

footer a:hover {
    text-shadow: 0 0 8px var(--glow-strong);
}