/* ==========================================================
   Base64 Encoder Decoder Tool — base64-tool.css
   ========================================================== */

/* ── Reset & Variables ── */
.b64t-wrap *,
.b64t-wrap *::before,
.b64t-wrap *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

.b64t-wrap {
    --b64-primary:      #4F46E5;
    --b64-primary-lt:   #818CF8;
    --b64-secondary:    #06B6D4;
    --b64-bg:           #F8FAFC;
    --b64-surface:      #FFFFFF;
    --b64-text:         #1E293B;
    --b64-muted:        #64748B;
    --b64-border:       #E2E8F0;
    --b64-success:      #10B981;
    --b64-error:        #EF4444;
    --b64-radius:       16px;
    --b64-shadow:       0 4px 24px rgba(79,70,229,.08), 0 1px 4px rgba(0,0,0,.04);
    --b64-shadow-hv:    0 8px 32px rgba(79,70,229,.16), 0 2px 8px rgba(0,0,0,.08);

    font-family: 'Syne', 'Segoe UI', sans-serif;
    color: var(--b64-text);
    max-width: 860px;
    margin: 0 auto;
    padding: 2rem 1rem 3rem;
    background-image:
        radial-gradient(ellipse at 20% 0%,  rgba(79,70,229,.06) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 100%, rgba(6,182,212,.06) 0%, transparent 60%);
}

/* ── Google Font (loaded only if not already present) ── */
@import url('https://fonts.googleapis.com/css2?family=DM+Mono:wght@400;500&family=Syne:wght@400;600;700;800&display=swap');

/* ── Header ── */
.b64t-header { text-align: center; margin-bottom: 2.5rem; }

.b64t-badge {
    display: inline-block;
    background: linear-gradient(135deg, rgba(79,70,229,.12), rgba(6,182,212,.12));
    color: var(--b64-primary);
    font-size: .72rem;
    font-weight: 700;
    letter-spacing: .12em;
    text-transform: uppercase;
    padding: .3rem .9rem;
    border-radius: 99px;
    margin-bottom: 1rem;
    border: 1px solid rgba(79,70,229,.18);
}

.b64t-title {
    font-size: clamp(1.6rem, 5vw, 2.6rem);
    font-weight: 800;
    line-height: 1.15;
    background: linear-gradient(135deg, var(--b64-primary) 0%, var(--b64-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: .55rem;
}

.b64t-subtitle {
    color: var(--b64-muted);
    font-size: .95rem;
    font-family: 'DM Mono', monospace;
}

/* ── Cards ── */
.b64t-card {
    background: var(--b64-surface);
    border-radius: var(--b64-radius);
    box-shadow: var(--b64-shadow);
    border: 1px solid var(--b64-border);
    padding: 1.75rem;
    transition: box-shadow .25s ease;
}

.b64t-card + .b64t-card { margin-top: 1.25rem; }
.b64t-card:hover        { box-shadow: var(--b64-shadow-hv); }

.b64t-card-label {
    display: flex;
    align-items: center;
    gap: .5rem;
    font-size: .78rem;
    font-weight: 700;
    letter-spacing: .1em;
    text-transform: uppercase;
    color: var(--b64-muted);
    margin-bottom: .9rem;
}

.b64t-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--b64-primary), var(--b64-secondary));
    flex-shrink: 0;
}

/* ── Textareas ── */
.b64t-textarea-wrap { position: relative; }

.b64t-textarea {
    width: 100%;
    min-height: 160px;
    padding: 1rem 1rem 2.4rem;
    font-family: 'DM Mono', 'Courier New', monospace;
    font-size: .88rem;
    line-height: 1.65;
    color: var(--b64-text);
    background: #F8FAFC;
    border: 1.5px solid var(--b64-border);
    border-radius: 12px;
    resize: vertical;
    outline: none;
    transition: border-color .2s, box-shadow .2s, background .2s;
    word-break: break-all;
}

.b64t-textarea:focus {
    border-color: var(--b64-primary-lt);
    box-shadow: 0 0 0 3px rgba(79,70,229,.1);
    background: #fff;
}

.b64t-textarea[readonly] {
    background: #F1F5F9;
    color: var(--b64-muted);
    cursor: default;
}

.b64t-textarea[readonly]:focus {
    box-shadow: none;
    border-color: var(--b64-border);
}

.b64t-counter {
    position: absolute;
    bottom: 10px;
    right: 12px;
    font-family: 'DM Mono', monospace;
    font-size: .7rem;
    color: var(--b64-muted);
    pointer-events: none;
}

/* ── Buttons ── */
.b64t-btn-row {
    display: flex;
    flex-wrap: wrap;
    gap: .6rem;
    margin-top: 1rem;
    align-items: center;
}

.b64t-btn {
    display: inline-flex;
    align-items: center;
    gap: .42rem;
    padding: .62rem 1.3rem;
    font-family: 'Syne', sans-serif;
    font-size: .88rem;
    font-weight: 700;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    line-height: 1;
    transition: transform .15s, box-shadow .15s, filter .15s;
    white-space: nowrap;
    text-decoration: none;
}

.b64t-btn:active { transform: scale(.96); }
.b64t-btn:hover:not(:disabled) {
    filter: brightness(1.07);
    transform: translateY(-1px);
}
.b64t-btn:disabled {
    opacity: .45;
    cursor: not-allowed;
    transform: none !important;
    filter: none !important;
}

.b64t-btn--encode {
    background: linear-gradient(135deg, #4F46E5 0%, #7C3AED 100%);
    color: #fff;
    box-shadow: 0 3px 12px rgba(79,70,229,.35);
}

.b64t-btn--decode {
    background: linear-gradient(135deg, #06B6D4 0%, #0891B2 100%);
    color: #fff;
    box-shadow: 0 3px 12px rgba(6,182,212,.35);
}

.b64t-btn--clear {
    background: #F1F5F9;
    color: var(--b64-muted);
    border: 1.5px solid var(--b64-border);
}

.b64t-btn--copy {
    background: linear-gradient(135deg, #10B981 0%, #059669 100%);
    color: #fff;
    box-shadow: 0 3px 12px rgba(16,185,129,.3);
    margin-left: auto;
}

/* ── Toast ── */
.b64t-toast {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    padding: .45rem 1rem;
    border-radius: 8px;
    font-size: .82rem;
    font-weight: 600;
    opacity: 0;
    transform: translateY(6px);
    transition: opacity .25s, transform .25s;
    pointer-events: none;
    margin-top: .75rem;
    min-height: 34px;
}

.b64t-toast.b64t-show          { opacity: 1; transform: translateY(0); }
.b64t-toast.b64t-toast--ok     { background: rgba(16,185,129,.12); color: #059669; }
.b64t-toast.b64t-toast--err    { background: rgba(239,68,68,.12);  color: #DC2626; }

/* ── Image preview ── */
.b64t-img-wrap {
    margin-top: 1.1rem;
}

.b64t-img-wrap[hidden] { display: none !important; }

.b64t-preview-label {
    font-size: .75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .1em;
    color: var(--b64-muted);
    margin-bottom: .6rem;
}

.b64t-img-wrap img {
    max-width: 100%;
    max-height: 320px;
    border-radius: 10px;
    border: 1.5px solid var(--b64-border);
    object-fit: contain;
    display: block;
}

/* ── Arrow ── */
.b64t-arrow {
    text-align: center;
    color: var(--b64-primary-lt);
    font-size: 1.6rem;
    line-height: 1;
    margin: .35rem 0;
    animation: b64t-bob 1.8s ease-in-out infinite;
}

@keyframes b64t-bob {
    0%, 100% { transform: translateY(0); }
    50%       { transform: translateY(4px); }
}

/* ── Screen-reader only ── */
.b64t-sr-only {
    position: absolute;
    width: 1px; height: 1px;
    padding: 0; margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    border: 0;
}

/* ── Responsive ── */
@media (max-width: 540px) {
    .b64t-wrap  { padding: 1.2rem .75rem 2.5rem; }
    .b64t-card  { padding: 1.2rem; }
    .b64t-btn--copy { margin-left: 0; }
    .b64t-title { font-size: 1.5rem; }
}