:root {
    --primary: #4f46e5;
    --primary-dark: #4338ca;
    --bg: #f3f4f6;
    --card: #ffffff;
    --text: #1f2937;
    --text-light: #6b7280;
    --border: #e5e7eb;
    --success: #059669;
    --error: #dc2626;
    --radius: 10px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    background: var(--card);
    border-bottom: 1px solid var(--border);
}
header h1 { font-size: 1.3rem; }
.logout-btn {
    color: var(--text-light);
    text-decoration: none;
    font-size: 14px;
}
.logout-btn:hover { color: var(--error); }

/* Main */
main { max-width: 900px; margin: 24px auto; padding: 0 16px; }

/* Cards */
.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 20px;
}
.card h2 { font-size: 1.1rem; margin-bottom: 16px; }
.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}
.card-header h2 { margin-bottom: 0; }

.hint { font-size: 13px; color: var(--text-light); margin-bottom: 16px; }

/* Delay grid */
.delay-grid {
    display: flex;
    gap: 12px;
    align-items: flex-end;
    flex-wrap: wrap;
}
.delay-field {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}
.delay-field input {
    width: 72px;
    padding: 10px 8px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 18px;
    text-align: center;
    font-weight: 600;
}
.delay-field input:focus { border-color: var(--primary); outline: none; }
.delay-field label {
    font-size: 12px;
    color: var(--text-light);
    font-weight: 500;
}
.delay-field-btn { align-self: flex-start; padding-top: 2px; }
.delay-summary {
    margin-top: 12px;
    font-size: 14px;
    color: var(--text);
    font-weight: 500;
}
.hint code { background: #f0f0f0; padding: 2px 6px; border-radius: 4px; font-size: 12px; }

/* Donate form */
.donate-form .form-row {
    display: flex;
    gap: 12px;
    align-items: flex-end;
}
.form-field { flex: 1; }
.form-field label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 4px;
}
.form-field input {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 15px;
}
.form-field input:focus { border-color: var(--primary); outline: none; }
.form-field select {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 15px;
    background: var(--card);
    cursor: pointer;
}
.form-field select:focus { border-color: var(--primary); outline: none; }
.form-field-btn { flex: 0 0 auto; }
.form-field-btn button {
    padding: 10px 20px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
}
.form-field-btn button:hover { background: var(--primary-dark); }
.form-field-btn button:disabled { opacity: 0.6; cursor: wait; }

/* Result box */
.result-box { margin-top: 16px; padding: 16px; border-radius: 8px; }
.result-success { background: #ecfdf5; color: #065f46; border: 1px solid #a7f3d0; border-radius: 8px; padding: 12px 16px; }
.result-success em { color: #047857; }
.result-error { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; border-radius: 8px; padding: 12px 16px; }

/* Tier rows */
.tier-row {
    display: flex;
    gap: 12px;
    align-items: flex-start;
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
}
.tier-row:last-child { border-bottom: none; }
.tier-range {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-shrink: 0;
}
.tier-num {
    width: 80px;
    padding: 8px 10px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 14px;
    text-align: center;
}
.tier-num:focus { border-color: var(--primary); outline: none; }
.tier-dash { color: var(--text-light); }
.tier-unit { font-size: 13px; color: var(--text-light); margin-left: 2px; }
.tier-msg {
    flex: 1;
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 14px;
    font-family: inherit;
    resize: vertical;
}
.tier-msg:focus { border-color: var(--primary); outline: none; }
.btn-delete {
    padding: 8px 12px;
    background: none;
    border: 1px solid #fecaca;
    border-radius: 6px;
    color: var(--error);
    cursor: pointer;
    font-size: 13px;
}
.btn-delete:hover { background: #fef2f2; }

/* Tier edit form */
.tier-edit {
    margin-top: 16px;
    padding: 16px;
    background: var(--bg);
    border-radius: 8px;
}
.tier-edit h3 { font-size: 14px; margin-bottom: 10px; }
.tier-inputs {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 10px;
}
.tier-inputs input { width: 100px; padding: 8px 10px; border: 1px solid var(--border); border-radius: 6px; font-size: 14px; }
.tier-inputs input:focus { border-color: var(--primary); outline: none; }
.tier-edit textarea {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 14px;
    font-family: inherit;
    margin-bottom: 10px;
}
.tier-edit textarea:focus { border-color: var(--primary); outline: none; }
.tier-actions { display: flex; gap: 8px; }

/* Buttons */
.btn-small {
    padding: 6px 14px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
}
.btn-small:hover { background: var(--primary-dark); }
.btn-primary {
    padding: 8px 16px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
}
.btn-primary:hover { background: var(--primary-dark); }
.btn-secondary {
    padding: 8px 16px;
    background: var(--card);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 14px;
    cursor: pointer;
}
.btn-secondary:hover { background: var(--bg); }

/* Table */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th { text-align: left; padding: 10px 12px; border-bottom: 2px solid var(--border); font-size: 13px; color: var(--text-light); font-weight: 600; }
td { padding: 10px 12px; border-bottom: 1px solid var(--border); }
.msg-cell { max-width: 280px; font-size: 13px; color: var(--text-light); }
.empty { text-align: center; color: var(--text-light); padding: 24px 12px; }

/* Badges */
.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}
.badge-simulated { background: #fef3c7; color: #92400e; }
.badge-sent { background: #d1fae5; color: #065f46; }
.badge-failed { background: #fecaca; color: #991b1b; }
.badge-pending { background: #e5e7eb; color: #6b7280; }
.badge-scheduled { background: #dbeafe; color: #1e40af; }
.badge-returning { background: #dbeafe; color: #1e40af; margin-left: 6px; }
.badge-segment { background: #f3e8ff; color: #6b21a8; }

/* New row animation */
.new-row { animation: fadeIn 0.3s ease; }
@keyframes fadeIn { from { background: #ecfdf5; } to { background: transparent; } }

/* Login */
.login-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
}
.login-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 48px 40px;
    text-align: center;
    max-width: 360px;
    width: 100%;
}
.login-card h1 { font-size: 1.8rem; margin-bottom: 4px; }
.login-sub { color: var(--text-light); margin-bottom: 24px; font-size: 14px; }
.login-card input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 16px;
    margin-bottom: 12px;
}
.login-card input:focus { border-color: var(--primary); outline: none; }
.login-card button {
    width: 100%;
    padding: 12px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
}
.login-card button:hover { background: var(--primary-dark); }

/* Responsive */
@media (max-width: 640px) {
    .donate-form .form-row { flex-direction: column; }
    .tier-row { flex-direction: column; }
    .tier-range { flex-wrap: wrap; }
}