:root {
    /* === Pastel palette === */
    --bg-base-1:   #f3e5f5;
    --bg-base-2:   #fce4ec;
    --bg-base-3:   #e8eaf6;
    --bg-base-4:   #e0f2f1;
    --bg-base-5:   #fff3e0;

    --hex-stroke:  #b39ddb;

    --card-bg:     rgba(255, 255, 255, 0.45);
    --card-bg-strong: rgba(255, 255, 255, 0.60);
    --card-border: rgba(255, 255, 255, 0.65);
    --card-shadow: 0 8px 32px rgba(179, 157, 219, 0.18);
    --card-shadow-hover: 0 12px 40px rgba(179, 157, 219, 0.25);

    --input-bg:    rgba(255, 255, 255, 0.50);
    --input-bg-focus: rgba(255, 255, 255, 0.70);

    --text:        #4a4a5e;
    --text-muted:  #8888a0;
    --text-on-pastel: #5e5e72;

    --primary:       #9575cd;
    --primary-hover: #7e57c2;
    --primary-soft:  #ede7f6;
    --primary-glow:  rgba(149, 117, 205, 0.30);

    --pink:        #f48fb1;
    --pink-soft:   #fce4ec;
    --mint:        #a5d6a7;
    --mint-soft:   #e8f5e9;
    --coral:       #ef9a9a;
    --coral-soft:  #ffebee;
    --amber:       #ffcc80;
    --amber-soft:  #fff8e1;

    --success:       #66bb6a;
    --success-bg:    #d4edda;
    --success-border: #a5d6a7;
    --danger:        #e57373;
    --danger-bg:     #f8d7da;
    --danger-border:  #ef9a9a;
    --warning:       #ffb74d;
    --warning-bg:    #fff3cd;
    --warning-border: #ffcc80;
    --info-bg:       #e8e0f5;
    --info-border:   #b39ddb;

    --radius:       14px;
    --radius-sm:    10px;
    --radius-xs:    7px;
    --font:         -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --mono:         "SF Mono", "Fira Code", "Cascadia Code", Consolas, "Liberation Mono", monospace;
}

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

html { height: 100%; }

body {
    min-height: 100vh;
    color: var(--text);
    font-family: var(--font);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    background-color: var(--bg-base-1);

    /* === Proper honeycomb hex pattern (5 hexagons per tile, seamless repeat) === */
    /* Pointy-top hexagons, side s=20, tile = 34.64 x 60 */
    background-image:
        url("data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20width='34.64'%20height='60'%20viewBox='0%200%2034.64%2060'%3E%3Cg%20fill='none'%20stroke='%23b39ddb'%20stroke-width='1.5'%20stroke-opacity='0.18'%3E%3Cpath%20d='M17.32%200%20L34.64%2010%20L34.64%2030%20L17.32%2040%20L0%2030%20L0%2010%20Z'/%3E%3Cpath%20d='M0%2030%20L17.32%2040%20L17.32%2060%20L0%2070%20L-17.32%2060%20L-17.32%2040%20Z'/%3E%3Cpath%20d='M34.64%2030%20L51.96%2040%20L51.96%2060%20L34.64%2070%20L17.32%2060%20L17.32%2040%20Z'/%3E%3Cpath%20d='M0%20-30%20L17.32%20-20%20L17.32%200%20L0%2010%20L-17.32%200%20L-17.32%20-20%20Z'/%3E%3Cpath%20d='M34.64%20-30%20L51.96%20-20%20L51.96%200%20L34.64%2010%20L17.32%200%20L17.32%20-20%20Z'/%3E%3C/g%3E%3C/svg%3E"),
        linear-gradient(135deg,
            var(--bg-base-1) 0%,
            var(--bg-base-2) 22%,
            var(--bg-base-3) 48%,
            var(--bg-base-4) 74%,
            var(--bg-base-5) 100%);
    background-repeat: repeat, no-repeat;
    background-attachment: fixed, fixed;
    background-size: 34.64px 60px, 100% 100%;
}

.app-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px 16px 60px;
    position: relative;
    z-index: 1;
}

/* ===================== HEADER ===================== */
.app-header { text-align: center; padding: 28px 0 20px; }
.app-header h1 {
    font-size: 30px;
    font-weight: 800;
    letter-spacing: -0.8px;
    color: var(--text);
    text-shadow: 0 2px 10px rgba(149, 117, 205, 0.15);
}
.subtitle {
    color: var(--text-muted);
    font-size: 14px;
    margin-top: 6px;
    font-weight: 500;
}

/* ===================== TABS ===================== */
.tabs {
    display: flex;
    gap: 8px;
    margin: 24px 0;
    background: var(--card-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius);
    padding: 8px;
    box-shadow: var(--card-shadow);
}
.tab-btn {
    flex: 1;
    padding: 13px 8px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all 0.25s ease;
    font-family: var(--font);
}
.tab-btn:hover {
    color: var(--text);
    background: rgba(255, 255, 255, 0.35);
}
.tab-btn.active {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 4px 14px var(--primary-glow);
}
.tab-icon { margin-right: 4px; }

/* ===================== TAB CONTENT ===================== */
.tab-content { display: none; animation: fadeIn 0.3s ease; }
.tab-content.active { display: block; }
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ===================== CARDS (glassmorphism) ===================== */
.card {
    background: var(--card-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius);
    padding: 26px;
    margin-bottom: 16px;
    box-shadow: var(--card-shadow);
    transition: box-shadow 0.3s ease;
}
.card:hover { box-shadow: var(--card-shadow-hover); }
.card h2 {
    font-size: 20px;
    margin-bottom: 8px;
    color: var(--text);
    font-weight: 700;
}
.card h3 {
    font-size: 17px;
    margin-bottom: 12px;
    color: var(--text);
    font-weight: 700;
}
.card-intro {
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 20px;
}

/* ===================== FORM ===================== */
.form-row.two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}
.form-group { margin-bottom: 18px; }
.form-group > label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text);
}
.label-optional {
    color: var(--text-muted);
    font-weight: 400;
    font-size: 12px;
}
.form-hint {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 6px;
}

input[type="text"], input[type="email"], input[type="password"], input[type="date"],
select, textarea {
    width: 100%;
    background: var(--input-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-sm);
    color: var(--text);
    padding: 10px 12px;
    font-size: 14px;
    font-family: var(--font);
    transition: all 0.2s ease;
}
select { cursor: pointer; }
select option { background: #fff; color: var(--text); }
textarea {
    font-family: var(--mono);
    font-size: 12px;
    resize: vertical;
    line-height: 1.5;
}
.key-textarea { font-size: 11px; line-height: 1.4; }
input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--input-bg-focus);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

/* === Password toggle === */
.input-with-toggle {
    display: flex;
    align-items: center;
    position: relative;
}
.input-with-toggle input { padding-right: 42px; }
.toggle-pass {
    position: absolute;
    right: 8px;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 18px;
    padding: 4px;
    opacity: 0.5;
    transition: opacity 0.2s;
}
.toggle-pass:hover { opacity: 1; }

/* === Algorithm info === */
.algo-info {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    background: var(--primary-soft);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-sm);
    margin-bottom: 18px;
    font-size: 13px;
}
.badge {
    background: var(--primary);
    color: #fff;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 700;
    white-space: nowrap;
}
.security-level { color: var(--text-muted); }

/* ===================== DROP ZONE ===================== */
.drop-zone {
    position: relative;
    border: 2px dashed transparent;
    border-radius: var(--radius-sm);
    transition: all 0.25s ease;
    padding: 0;
}
.drop-zone.drag-over {
    border-color: var(--primary);
    background: var(--primary-soft);
    box-shadow: 0 0 0 4px var(--primary-glow);
}
.drop-zone.drag-over .drop-zone-hint {
    opacity: 1;
}
.drop-zone-hint {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--card-bg-strong);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-sm);
    padding: 16px 28px;
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s ease;
    z-index: 5;
    white-space: nowrap;
}
.drop-zone-hint .drop-icon { font-size: 28px; display: block; margin-bottom: 4px; text-align: center; }

/* Upload area */
.upload-area {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 10px;
    flex-wrap: wrap;
}
.upload-hint {
    font-size: 12px;
    color: var(--text-muted);
}

/* ===================== BUTTONS ===================== */
.btn {
    border: none;
    border-radius: var(--radius-sm);
    padding: 12px 20px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--font);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 4px 14px var(--primary-glow);
}
.btn-primary:hover:not(:disabled) {
    background: var(--primary-hover);
    box-shadow: 0 6px 20px var(--primary-glow);
    transform: translateY(-1px);
}
.btn-primary:active:not(:disabled) { transform: translateY(0); }

.btn-small {
    padding: 7px 13px;
    font-size: 12px;
    background: rgba(255, 255, 255, 0.50);
    color: var(--text);
    border: 1px solid var(--card-border);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}
.btn-small:hover:not(:disabled) {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}
.btn-upload {
    background: var(--primary-soft);
    color: var(--primary);
    border: 1px solid var(--card-border);
}
.btn-upload:hover {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.form-actions {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-top: 8px;
    flex-wrap: wrap;
}
.rate-limit-info {
    font-size: 12px;
    color: var(--text-muted);
    font-weight: 500;
}
.rate-limit-info.warn { color: var(--warning); }
.rate-limit-info.blocked { color: var(--danger); font-weight: 600; }

/* ===================== KEY RESULTS ===================== */
.results-card {
    border-color: var(--primary);
    background: var(--card-bg-strong);
}
.key-result {
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 1px solid rgba(179, 157, 219, 0.15);
}
.key-result:last-child { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }
.key-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    flex-wrap: wrap;
    gap: 8px;
}
.key-label {
    font-weight: 700;
    font-size: 14px;
    color: var(--text);
}
.key-label-private { color: var(--warning); }
.key-actions { display: flex; gap: 8px; }

.private-key-warning {
    background: var(--warning-bg);
    border: 1px solid var(--warning-border);
    color: #d68a00;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    margin-bottom: 10px;
    font-weight: 500;
}
.key-fingerprint {
    margin-top: 8px;
    font-size: 12px;
    color: var(--text-muted);
    font-family: var(--mono);
    word-break: break-all;
}

/* ===================== DOWNLOAD FILENAME ROW ===================== */
.download-filename-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 14px;
    flex-wrap: wrap;
}
.download-filename-row label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
    white-space: nowrap;
}
.download-filename-row .filename-input {
    flex: 1;
    min-width: 200px;
    background: var(--input-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-sm);
    padding: 8px 12px;
    font-size: 13px;
    font-family: var(--mono);
    color: var(--text);
    transition: all 0.2s ease;
}
.download-filename-row .filename-input:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--input-bg-focus);
    box-shadow: 0 0 0 3px var(--primary-glow);
}
.btn-reset-filename {
    padding: 7px 13px;
    font-size: 12px;
    background: var(--primary-soft);
    color: var(--primary);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}
.btn-reset-filename:hover {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

/* ===================== STATUS ===================== */
.status {
    margin-top: 16px;
    padding: 14px 18px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    display: none;
    white-space: pre-wrap;
    line-height: 1.6;
}
.status.show { display: block; }
.status.success {
    background: var(--success-bg);
    border: 1px solid var(--success-border);
    color: #2e7d32;
}
.status.error {
    background: var(--danger-bg);
    border: 1px solid var(--danger-border);
    color: #c62828;
}
.status.info {
    background: var(--info-bg);
    border: 1px solid var(--info-border);
    color: var(--text);
}

/* ===================== HELP CARD ===================== */
.help-card {
    background: rgba(255, 255, 255, 0.35);
    border-color: rgba(179, 157, 219, 0.25);
}
.help-content p {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 8px;
}
.help-content p:last-child { margin-bottom: 0; }
.help-content strong { color: var(--text); }
.help-content code {
    background: var(--primary-soft);
    padding: 2px 7px;
    border-radius: 5px;
    font-size: 12px;
    font-family: var(--mono);
    color: var(--primary);
}
.link-btn {
    background: none;
    border: none;
    color: var(--primary);
    cursor: pointer;
    font-size: 13px;
    text-decoration: underline;
    font-family: var(--font);
    padding: 0;
}
.link-btn:hover { color: var(--primary-hover); }

/* ===================== FOOTER ===================== */
.app-footer {
    text-align: center;
    margin-top: 32px;
    padding: 18px;
    font-size: 12px;
    color: var(--text-muted);
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius);
}
.app-footer strong { color: var(--text); }

/* === Spinner === */
.btn-spinner { display: inline-block; }

/* === Responsive === */
@media (max-width: 600px) {
    .form-row.two-col { grid-template-columns: 1fr; }
    .tabs { flex-direction: column; }
    .tab-btn { text-align: center; }
    .app-header h1 { font-size: 24px; }
    .card { padding: 18px; }
    .key-actions { flex-wrap: wrap; }
}