/* ============================================================
   Shared design system — extracted from the root dashboard.
   Every tool loads this file; page-specific CSS stays minimal.
   ============================================================ */

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

:root {
    --accent-blue: #6C8EFF;
    --accent-green: #5EEEAD;
    --accent-purple: #B18CFF;
    --accent-amber: #FFD073;
    --accent-rose: #FF8FA3;
    --accent: var(--accent-blue);
    --danger: #ff4d6a;
    --radius: 20px;
    --radius-sm: 12px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Per-tool accent — set on <body> */
.accent-blue   { --accent: var(--accent-blue); }
.accent-green  { --accent: var(--accent-green); }
.accent-purple { --accent: var(--accent-purple); }
.accent-amber  { --accent: var(--accent-amber); }
.accent-rose   { --accent: var(--accent-rose); }

/* ===== DARK THEME (default) ===== */
[data-theme="dark"] {
    --bg-primary: #0a0a0f;
    --bg-card: rgba(255, 255, 255, 0.04);
    --bg-card-hover: rgba(255, 255, 255, 0.07);
    --bg-inset: rgba(255, 255, 255, 0.03);
    --border-card: rgba(255, 255, 255, 0.08);
    --border-card-hover: rgba(255, 255, 255, 0.16);
    --text-primary: #f0f0f5;
    --text-secondary: rgba(240, 240, 245, 0.55);
    --text-tertiary: rgba(240, 240, 245, 0.35);
    --icon-bg: rgba(255, 255, 255, 0.04);
    --icon-bg-hover: rgba(255, 255, 255, 0.08);
    --card-shadow-hover: rgba(0, 0, 0, 0.3);
    --footer-border: rgba(255, 255, 255, 0.04);
    --badge-bg: rgba(255, 255, 255, 0.04);
    --badge-border: rgba(255, 255, 255, 0.06);
    --ambient-1: rgba(108, 142, 255, 0.06);
    --ambient-2: rgba(94, 238, 173, 0.04);
    --input-bg: rgba(255, 255, 255, 0.04);
    --btn-primary-text: #0a0a0f;
    --warning: #FFD073;
}

/* ===== LIGHT THEME ===== */
[data-theme="light"] {
    --bg-primary: #f5f5f7;
    --bg-card: rgba(255, 255, 255, 0.85);
    --bg-card-hover: rgba(255, 255, 255, 1);
    --bg-inset: rgba(0, 0, 0, 0.03);
    --border-card: rgba(0, 0, 0, 0.06);
    --border-card-hover: rgba(0, 0, 0, 0.12);
    --text-primary: #1a1a2e;
    --text-secondary: rgba(26, 26, 46, 0.55);
    --text-tertiary: rgba(26, 26, 46, 0.35);
    --icon-bg: rgba(0, 0, 0, 0.04);
    --icon-bg-hover: rgba(0, 0, 0, 0.07);
    --card-shadow-hover: rgba(0, 0, 0, 0.08);
    --footer-border: rgba(0, 0, 0, 0.06);
    --badge-bg: rgba(0, 0, 0, 0.04);
    --badge-border: rgba(0, 0, 0, 0.08);
    --ambient-1: rgba(108, 142, 255, 0.05);
    --ambient-2: rgba(94, 238, 173, 0.04);
    --input-bg: rgba(255, 255, 255, 0.9);
    --btn-primary-text: #1a1a2e;
    --warning: #8f6400;
}

/* ===== BASE ===== */
html {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    padding: 24px;
    position: relative;
    overflow-x: hidden;
    transition: background-color 0.4s ease, color 0.4s ease;
}

/* ===== AMBIENT BACKGROUND ===== */
body::before {
    content: '';
    position: fixed;
    top: -40%;
    left: -20%;
    width: 80%;
    height: 80%;
    background: radial-gradient(ellipse, var(--ambient-1) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

body::after {
    content: '';
    position: fixed;
    bottom: -30%;
    right: -15%;
    width: 70%;
    height: 70%;
    background: radial-gradient(ellipse, var(--ambient-2) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

/* ===== TOOL PAGE LAYOUT ===== */
.page {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 720px;
    margin: 0 auto;
}

.page--wide {
    max-width: 1080px;
}

/* ===== TOP BAR (back link · title · actions) ===== */
.topbar {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 32px;
    animation: fadeInUp 0.6s ease-out forwards;
}

.topbar__back {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    flex-shrink: 0;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-card);
    background: var(--bg-card);
    color: var(--text-secondary);
    text-decoration: none;
    transition: background var(--transition), border-color var(--transition), color var(--transition);
}

.topbar__back:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-card-hover);
    color: var(--text-primary);
}

.topbar__back svg {
    width: 18px;
    height: 18px;
}

.topbar__heading {
    flex: 1;
    min-width: 0;
}

.topbar__title {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.3px;
    line-height: 1.2;
}

.topbar__subtitle {
    font-size: 12.5px;
    color: var(--text-tertiary);
    margin-top: 2px;
}

.topbar__actions {
    display: flex;
    gap: 8px;
    flex-shrink: 0;
}

/* ===== ICON BUTTON (theme toggle, logout, …) ===== */
.icon-btn {
    position: relative;
    width: 42px;
    height: 42px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-card);
    background: var(--bg-card);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition:
        background var(--transition),
        border-color var(--transition),
        color var(--transition),
        transform 0.2s ease;
}

.icon-btn:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-card-hover);
    color: var(--text-primary);
}

.icon-btn:active {
    transform: scale(0.92);
}

.icon-btn svg {
    width: 18px;
    height: 18px;
    transition: transform 0.4s ease;
}

/* Theme toggle sun/moon crossfade */
.icon-btn .icon-sun,
.icon-btn .icon-moon {
    position: absolute;
    transition: opacity 0.3s ease, transform 0.4s ease;
}

[data-theme="dark"] .icon-btn .icon-sun { opacity: 1; transform: rotate(0deg); }
[data-theme="dark"] .icon-btn .icon-moon { opacity: 0; transform: rotate(-90deg) scale(0.5); }
[data-theme="light"] .icon-btn .icon-sun { opacity: 0; transform: rotate(90deg) scale(0.5); }
[data-theme="light"] .icon-btn .icon-moon { opacity: 1; transform: rotate(0deg); }

/* ===== CARD ===== */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 16px;
    position: relative;
}

.card__title {
    font-size: 15px;
    font-weight: 600;
    letter-spacing: -0.2px;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.card__title svg {
    width: 18px;
    height: 18px;
    color: var(--accent);
}

/* ===== FORMS ===== */
.field {
    margin-bottom: 14px;
}

.field:last-child {
    margin-bottom: 0;
}

.label {
    display: block;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--text-tertiary);
    margin-bottom: 8px;
}

.input,
.select {
    width: 100%;
    padding: 12px 14px;
    font-family: inherit;
    font-size: 14.5px;
    font-weight: 500;
    color: var(--text-primary);
    background: var(--input-bg);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-sm);
    transition: border-color var(--transition), background var(--transition), box-shadow var(--transition);
    -webkit-appearance: none;
    appearance: none;
}

.input::placeholder {
    color: var(--text-tertiary);
}

.input:focus,
.select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent);
}

.select {
    cursor: pointer;
    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='%23888899' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 38px;
}

/* Input with a currency/unit prefix or suffix */
.input-group {
    position: relative;
}

.input-group__prefix {
    position: absolute;
    inset: 0 auto 0 0;
    display: flex;
    align-items: center;
    padding-left: 14px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-tertiary);
    pointer-events: none;
}

.input-group__suffix {
    position: absolute;
    inset: 0 0 0 auto;
    display: flex;
    align-items: center;
    padding-right: 14px;
    font-size: 13px;
    color: var(--text-tertiary);
    pointer-events: none;
}

.input-group .input {
    padding-left: 44px;
}

.input-group--suffix .input {
    padding-left: 14px;
    padding-right: 34px;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 18px;
    font-family: inherit;
    font-size: 13.5px;
    font-weight: 600;
    letter-spacing: 0.1px;
    color: var(--text-primary);
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-sm);
    cursor: pointer;
    text-decoration: none;
    transition:
        background var(--transition),
        border-color var(--transition),
        color var(--transition),
        transform 0.15s ease,
        box-shadow var(--transition);
    -webkit-tap-highlight-color: transparent;
    user-select: none;
}

.btn:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-card-hover);
}

.btn:active {
    transform: scale(0.97);
}

.btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

.btn svg {
    width: 16px;
    height: 16px;
}

.btn--primary {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--btn-primary-text);
}

.btn--primary:hover {
    background: color-mix(in srgb, var(--accent) 85%, white);
    border-color: color-mix(in srgb, var(--accent) 85%, white);
    box-shadow: 0 4px 20px color-mix(in srgb, var(--accent) 30%, transparent);
}

.btn--ghost {
    background: transparent;
    border-color: transparent;
    color: var(--text-secondary);
}

.btn--ghost:hover {
    background: var(--bg-card);
    color: var(--text-primary);
}

.btn--danger {
    color: var(--danger);
}

.btn--danger:hover {
    background: color-mix(in srgb, var(--danger) 12%, transparent);
    border-color: color-mix(in srgb, var(--danger) 35%, transparent);
}

.btn--sm {
    padding: 8px 12px;
    font-size: 12.5px;
    border-radius: 10px;
}

.btn--block {
    width: 100%;
}

.btn--dashed {
    background: transparent;
    border-style: dashed;
    border-color: color-mix(in srgb, var(--accent) 40%, transparent);
    color: var(--accent);
}

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

/* ===== BADGE / TAG ===== */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    color: var(--text-tertiary);
    background: var(--badge-bg);
    border: 1px solid var(--badge-border);
    padding: 3px 8px;
    border-radius: 6px;
    vertical-align: middle;
}

.badge--accent {
    color: var(--accent);
    border-color: color-mix(in srgb, var(--accent) 30%, transparent);
    background: color-mix(in srgb, var(--accent) 8%, transparent);
}

/* ===== STATUS BANNER ===== */
.banner {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    font-size: 12.5px;
    font-weight: 600;
    background: var(--bg-inset);
    border: 1px solid var(--border-card);
    color: var(--text-secondary);
}

.banner svg { width: 15px; height: 15px; }

.banner--success {
    color: var(--accent-green);
    background: color-mix(in srgb, var(--accent-green) 8%, transparent);
    border-color: color-mix(in srgb, var(--accent-green) 25%, transparent);
}

.banner--danger {
    color: var(--danger);
    background: color-mix(in srgb, var(--danger) 8%, transparent);
    border-color: color-mix(in srgb, var(--danger) 25%, transparent);
}

/* ===== TOGGLE SWITCH ===== */
.switch {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    user-select: none;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
}

.switch__track {
    position: relative;
    width: 40px;
    height: 22px;
    border-radius: 11px;
    background: var(--bg-inset);
    border: 1px solid var(--border-card);
    transition: background var(--transition), border-color var(--transition);
}

.switch__thumb {
    position: absolute;
    top: 2px;
    left: 2px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--text-tertiary);
    transition: transform var(--transition), background var(--transition);
}

.switch.on .switch__track {
    background: color-mix(in srgb, var(--accent) 25%, transparent);
    border-color: var(--accent);
}

.switch.on .switch__thumb {
    transform: translateX(18px);
    background: var(--accent);
}

/* ===== LIST ROWS ===== */
.row {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 0;
    border-bottom: 1px solid var(--footer-border);
}

.row:last-child {
    border-bottom: none;
}

/* ===== MODAL ===== */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    padding: 24px;
}

.modal-overlay.open {
    display: flex;
}

.modal {
    background: var(--bg-primary);
    border: 1px solid var(--border-card);
    border-radius: var(--radius);
    padding: 28px;
    width: 100%;
    max-width: 380px;
    text-align: center;
    animation: fadeInUp 0.3s ease-out;
}

.modal__title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
}

/* ===== FOOTER ===== */
.footer {
    text-align: center;
    margin-top: 48px;
    padding-top: 24px;
    border-top: 1px solid var(--footer-border);
}

.footer__text {
    font-size: 12px;
    color: var(--text-tertiary);
    font-weight: 400;
}

/* ===== PIN SCREEN ===== */
.pin-overlay {
    position: fixed;
    inset: 0;
    z-index: 1000;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.pin-container {
    text-align: center;
    width: 100%;
    max-width: 320px;
    padding: 24px;
    animation: fadeInUp 0.5s ease-out;
    position: relative;
    z-index: 1;
}

.pin-lock-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 24px;
    color: var(--text-tertiary);
}

.pin-title {
    font-size: 22px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.pin-subtitle {
    font-size: 13px;
    color: var(--text-tertiary);
    margin-bottom: 32px;
}

.pin-dots {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 36px;
}

.pin-dot {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    border: 2px solid var(--border-card-hover);
    background: transparent;
    transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.pin-dot.filled {
    background: var(--accent);
    border-color: var(--accent);
    transform: scale(1.15);
}

.pin-dot.error {
    background: var(--danger);
    border-color: var(--danger);
}

.pin-numpad {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    max-width: 264px;
    margin: 0 auto;
}

.pin-key {
    height: 64px;
    border-radius: 16px;
    border: 1px solid var(--border-card);
    background: var(--bg-card);
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    font-size: 22px;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition:
        background var(--transition),
        border-color var(--transition),
        transform 0.15s ease;
    -webkit-tap-highlight-color: transparent;
    user-select: none;
}

.pin-key:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-card-hover);
}

.pin-key:active {
    transform: scale(0.93);
}

.pin-key--empty {
    visibility: hidden;
}

.pin-key--delete {
    font-size: 14px;
    color: var(--text-secondary);
    border-color: transparent;
    background: transparent;
}

.pin-key--delete:hover {
    color: var(--text-primary);
    background: var(--bg-card);
}

.pin-key--delete svg {
    width: 24px;
    height: 24px;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    15% { transform: translateX(-8px); }
    30% { transform: translateX(8px); }
    45% { transform: translateX(-6px); }
    60% { transform: translateX(6px); }
    75% { transform: translateX(-3px); }
    90% { transform: translateX(3px); }
}

.pin-dots.shake {
    animation: shake 0.5s ease;
}

/* ===== ANIMATIONS ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-in {
    animation: fadeInUp 0.6s ease-out forwards;
    opacity: 0;
}

.animate-in:nth-child(1) { animation-delay: 0s; }
.animate-in:nth-child(2) { animation-delay: 0.08s; }
.animate-in:nth-child(3) { animation-delay: 0.16s; }
.animate-in:nth-child(4) { animation-delay: 0.24s; }
.animate-in:nth-child(5) { animation-delay: 0.32s; }

/* ===== UTILITIES ===== */
.mono {
    font-family: 'SF Mono', 'Consolas', 'Menlo', monospace;
    font-variant-numeric: tabular-nums;
}

.text-secondary { color: var(--text-secondary); }
.text-tertiary { color: var(--text-tertiary); }
.text-accent { color: var(--accent); }
.text-success { color: var(--accent-green); }
.text-danger { color: var(--danger); }
.text-center { text-align: center; }
.text-right { text-align: right; }

/* ===== RESPONSIVE ===== */
@media (max-width: 520px) {
    body {
        padding: 16px;
    }

    .topbar {
        margin-bottom: 24px;
    }

    .card {
        padding: 20px;
    }
}
