/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   Nano Banana Image Generator — Public Frontend
   ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

/* ── Container ─────────────────────────────────── */
.nbig-container {
    --nbig-primary: #FFB300;
    --nbig-primary-dark: #FF8F00;
    --nbig-accent: #FFE135;
    --nbig-bg-dark: #0f0f1a;
    --nbig-bg-card: #1a1a2e;
    --nbig-bg-input: #16162a;
    --nbig-text: #e8e8f0;
    --nbig-text-muted: #8888a8;
    --nbig-border: #2a2a44;
    --nbig-success: #00d68f;
    --nbig-error: #ff4757;
    --nbig-radius: 16px;
    --nbig-radius-sm: 10px;

    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    max-width: 860px;
    margin: 30px auto;
    padding: 0;
    color: var(--nbig-text);
    background: var(--nbig-bg-dark);
    border-radius: var(--nbig-radius);
    overflow: hidden;
    box-shadow:
        0 4px 40px rgba(255, 179, 0, 0.08),
        0 0 0 1px rgba(255, 179, 0, 0.1);
}

/* ── Header ────────────────────────────────────── */
.nbig-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 28px 32px;
    background: linear-gradient(135deg, rgba(255,225,53,0.12) 0%, rgba(255,179,0,0.08) 100%);
    border-bottom: 1px solid var(--nbig-border);
}

.nbig-title {
    margin: 0;
    font-size: 24px;
    font-weight: 800;
    color: #fff;
    display: flex;
    align-items: center;
    gap: 10px;
}

.nbig-title-icon {
    font-size: 28px;
    animation: nbig-bounce 2s ease-in-out infinite;
}

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

.nbig-header .nbig-subtitle {
    margin: 4px 0 0;
    font-size: 13px;
    color: var(--nbig-text-muted);
    font-weight: 400;
}

.nbig-balance-badge {
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(255, 179, 0, 0.12);
    border: 1px solid rgba(255, 179, 0, 0.25);
    padding: 8px 16px;
    border-radius: 50px;
    font-size: 14px;
    font-weight: 600;
    color: var(--nbig-primary);
    flex-shrink: 0;
}

.nbig-balance-icon {
    font-size: 18px;
}

.nbig-balance-amount {
    font-weight: 700;
    font-size: 16px;
}

.nbig-balance-label {
    color: var(--nbig-text-muted);
    font-weight: 400;
    font-size: 12px;
}

/* ── Form Section ──────────────────────────────── */
.nbig-form-section {
    padding: 28px 32px;
}

.nbig-form-group {
    margin-bottom: 20px;
}

.nbig-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--nbig-text);
    margin-bottom: 8px;
    letter-spacing: 0.02em;
}

.nbig-textarea {
    width: 100%;
    padding: 16px;
    background: var(--nbig-bg-input);
    border: 1px solid var(--nbig-border);
    border-radius: var(--nbig-radius-sm);
    color: var(--nbig-text);
    font-family: 'Inter', sans-serif;
    font-size: 15px;
    line-height: 1.6;
    resize: vertical;
    transition: border-color 0.25s ease, box-shadow 0.25s ease;
    box-sizing: border-box;
}

.nbig-textarea:focus {
    outline: none;
    border-color: var(--nbig-primary);
    box-shadow: 0 0 0 3px rgba(255, 179, 0, 0.15);
}

.nbig-textarea::placeholder {
    color: var(--nbig-text-muted);
    opacity: 0.6;
}

.nbig-char-count {
    text-align: right;
    font-size: 12px;
    color: var(--nbig-text-muted);
    margin-top: 6px;
}

/* ── Settings Row ──────────────────────────────── */
.nbig-settings-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.nbig-select {
    width: 100%;
    padding: 12px 16px;
    background: var(--nbig-bg-input);
    border: 1px solid var(--nbig-border);
    border-radius: var(--nbig-radius-sm);
    color: var(--nbig-text);
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    cursor: pointer;
    transition: border-color 0.25s ease;
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238888a8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

.nbig-select:focus {
    outline: none;
    border-color: var(--nbig-primary);
    box-shadow: 0 0 0 3px rgba(255, 179, 0, 0.15);
}

.nbig-select option {
    background: var(--nbig-bg-card);
    color: var(--nbig-text);
}

/* ── Actions ───────────────────────────────────── */
.nbig-actions {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

.nbig-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: var(--nbig-radius-sm);
    font-family: 'Inter', sans-serif;
    font-size: 15px;
    font-weight: 700;
    cursor: pointer;
    border: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-decoration: none;
    box-sizing: border-box;
}

.nbig-btn-generate {
    background: linear-gradient(135deg, var(--nbig-accent) 0%, var(--nbig-primary) 50%, var(--nbig-primary-dark) 100%);
    color: #1a1a2e;
    box-shadow: 0 4px 20px rgba(255, 179, 0, 0.35);
    position: relative;
    overflow: hidden;
}

.nbig-btn-generate::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s ease;
}

.nbig-btn-generate:hover::before {
    left: 100%;
}

.nbig-btn-generate:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(255, 179, 0, 0.5);
}

.nbig-btn-generate:active {
    transform: translateY(0);
}

.nbig-btn-generate:disabled,
.nbig-btn-generate.nbig-btn-disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.nbig-btn-generate:disabled::before {
    display: none;
}

.nbig-btn-login {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    box-shadow: 0 4px 20px rgba(102, 126, 234, 0.3);
}

.nbig-btn-login:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(102, 126, 234, 0.45);
    color: #fff;
}

.nbig-cost-label {
    font-size: 13px;
    color: var(--nbig-text-muted);
    font-weight: 500;
}

/* ── Progress ──────────────────────────────────── */
.nbig-progress-section {
    padding: 24px 32px;
    border-top: 1px solid var(--nbig-border);
}

.nbig-progress-bar-container {
    width: 100%;
    height: 8px;
    background: var(--nbig-bg-input);
    border-radius: 20px;
    overflow: hidden;
}

.nbig-progress-bar {
    width: 0%;
    height: 100%;
    background: linear-gradient(90deg, var(--nbig-accent), var(--nbig-primary), var(--nbig-primary-dark));
    border-radius: 20px;
    transition: width 0.5s ease;
    animation: nbig-glow 1.5s ease-in-out infinite;
}

@keyframes nbig-glow {
    0%, 100% { box-shadow: 0 0 8px rgba(255, 179, 0, 0.4); }
    50% { box-shadow: 0 0 16px rgba(255, 179, 0, 0.7); }
}

.nbig-progress-text {
    text-align: center;
    font-size: 14px;
    color: var(--nbig-text-muted);
    margin-top: 14px;
    font-weight: 500;
}

/* ── Result ────────────────────────────────────── */
.nbig-result-section {
    padding: 28px 32px;
    border-top: 1px solid var(--nbig-border);
}

.nbig-result-title {
    text-align: center;
    font-size: 20px;
    font-weight: 700;
    color: #fff;
    margin: 0 0 20px;
}

.nbig-result-image-wrap {
    text-align: center;
    border-radius: var(--nbig-radius);
    overflow: hidden;
    background: var(--nbig-bg-input);
    border: 1px solid var(--nbig-border);
}

.nbig-result-image {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto;
    animation: nbig-fadeIn 0.6s ease-out;
}

@keyframes nbig-fadeIn {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

.nbig-result-actions {
    display: flex;
    justify-content: center;
    gap: 14px;
    margin-top: 20px;
    flex-wrap: wrap;
}

.nbig-btn-download {
    background: linear-gradient(135deg, var(--nbig-success), #00b377);
    color: #fff;
    box-shadow: 0 4px 16px rgba(0, 214, 143, 0.3);
}

.nbig-btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(0, 214, 143, 0.45);
    color: #fff;
}

.nbig-btn-new {
    background: var(--nbig-bg-input);
    color: var(--nbig-text);
    border: 1px solid var(--nbig-border);
}

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

/* ── Error Container ───────────────────────────── */
#nbig-error-container {
    margin: 0 32px;
}

.nbig-error-box {
    background: rgba(255, 71, 87, 0.08);
    border: 1px solid rgba(255, 71, 87, 0.25);
    border-radius: var(--nbig-radius-sm);
    padding: 16px 20px;
    margin-top: 16px;
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.nbig-error-icon {
    font-size: 20px;
    flex-shrink: 0;
    line-height: 1;
}

.nbig-error-content {
    flex: 1;
}

.nbig-error-message {
    color: var(--nbig-error);
    font-size: 14px;
    font-weight: 500;
    margin: 0 0 8px;
}

.nbig-error-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 8px;
}

.nbig-btn-buy-coins {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 18px;
    background: linear-gradient(135deg, var(--nbig-primary), var(--nbig-primary-dark));
    color: #1a1a2e;
    border: none;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 700;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.25s ease;
}

.nbig-btn-buy-coins:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(255, 179, 0, 0.4);
    color: #1a1a2e;
}

.nbig-error-dismiss {
    background: transparent;
    border: 1px solid rgba(255, 71, 87, 0.3);
    color: var(--nbig-text-muted);
    padding: 8px 14px;
    border-radius: 8px;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.nbig-error-dismiss:hover {
    border-color: var(--nbig-text-muted);
    color: var(--nbig-text);
}

/* ── Gallery ───────────────────────────────────── */
.nbig-gallery-section {
    padding: 24px 32px;
    border-top: 1px solid var(--nbig-border);
}

.nbig-gallery-title {
    font-size: 18px;
    font-weight: 700;
    color: #fff;
    margin: 0 0 16px;
}

.nbig-gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 12px;
}

.nbig-gallery-item {
    border-radius: 10px;
    overflow: hidden;
    aspect-ratio: 1;
    cursor: pointer;
    transition: transform 0.25s ease, box-shadow 0.25s ease;
    border: 1px solid var(--nbig-border);
}

.nbig-gallery-item:hover {
    transform: scale(1.04);
    box-shadow: 0 4px 20px rgba(255, 179, 0, 0.2);
}

.nbig-gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* ── Spinner ───────────────────────────────────── */
.nbig-spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(26, 26, 46, 0.3);
    border-top-color: #1a1a2e;
    border-radius: 50%;
    animation: nbig-spin 0.6s linear infinite;
}

@keyframes nbig-spin {
    to { transform: rotate(360deg); }
}

/* ── Responsive ────────────────────────────────── */
@media (max-width: 640px) {
    .nbig-container {
        margin: 16px;
        border-radius: 12px;
    }

    .nbig-header {
        flex-direction: column;
        gap: 14px;
        padding: 20px 20px;
        text-align: center;
    }

    .nbig-title {
        font-size: 20px;
        justify-content: center;
    }

    .nbig-form-section,
    .nbig-progress-section,
    .nbig-result-section,
    .nbig-gallery-section {
        padding: 20px;
    }

    #nbig-error-container {
        margin: 0 20px;
    }

    .nbig-settings-row {
        grid-template-columns: 1fr;
    }

    .nbig-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .nbig-btn {
        width: 100%;
        text-align: center;
    }

    .nbig-cost-label {
        text-align: center;
    }

    .nbig-result-actions {
        flex-direction: column;
    }

    .nbig-result-actions .nbig-btn {
        width: 100%;
    }
}