/* File: generator.css (FINAL LAYOUT) */

/* --- THEME DEFINITIONS --- */
body.dark-theme {
    --bg-color: #1a1d21; --surface-color: #2c2f33; --surface-alt-color: #1f2937;
    --primary-text: #e0e0e0; --secondary-text: #a9a9a9; --border-color: #4f545c;
    --accent-color: #3b82f6; --accent-color-text: #ffffff; --error-text-color: #f87171;
}
body.light-theme {
    --bg-color: #f1f5f9; --surface-color: #ffffff; --surface-alt-color: #f8fafc;
    --primary-text: #1e293b; --secondary-text: #64748b; --border-color: #e2e8f0;
    --accent-color: #2563eb; --accent-color-text: #ffffff; --error-text-color: #ef4444;
}

/* --- Base Styling --- */
body {
    margin: 0; font-family: 'Inter', 'Kanit', sans-serif; background-color: var(--bg-color);
    color: var(--primary-text); display: flex; justify-content: center; align-items: flex-start;
    min-height: 100vh; padding: 2rem 1rem; box-sizing: border-box; transition: background-color 0.3s, color 0.3s;
}

/* --- Theme Toggle Button --- */
#theme-toggle {
    position: fixed; top: 20px; right: 20px; background: var(--surface-color); border: 1px solid var(--border-color);
    color: var(--primary-text); width: 40px; height: 40px; border-radius: 50%;
    cursor: pointer; font-size: 18px; display: flex; justify-content: center;
    align-items: center; z-index: 1000; transition: all 0.3s;
}
#theme-toggle:hover { transform: scale(1.1); }

/* --- Layout --- */
.container { width: 100%; max-width: 56rem; margin: 0 auto; }
.main-card {
    background-color: var(--surface-color); border-radius: 1rem;
    box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1); padding: 1.5rem;
    border: 1px solid var(--border-color);
}
@media (min-width: 640px) { .main-card { padding: 2rem; } }
body.dark-theme .main-card { box-shadow: 0 10px 15px -3px rgba(0,0,0,0.2); }

/* --- Header --- */
.page-header { text-align: center; margin-bottom: 2rem; }
.page-header h1 { font-size: 1.875rem; font-weight: 700; color: var(--primary-text); }
.page-header p { color: var(--secondary-text); margin-top: 0.5rem; }

/* --- Controls Section (FINAL STACKED LAYOUT) --- */
.controls-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-bottom: 2rem;
    align-items: center; 
}
.control-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    width: 100%;
    max-width: 450px;
}
.control-group label {
    font-weight: 500;
    color: var(--secondary-text);
    margin-bottom: 0.25rem;
}
/* On wider screens, put label and control side-by-side */
@media (min-width: 500px) {
    .control-group {
        flex-direction: row;
        justify-content: space-between;
    }
    .control-group label {
        margin-bottom: 0;
        text-align: right;
        flex-basis: 150px;
        flex-shrink: 0;
        margin-right: 1rem;
    }
}

.button-group {
    display: inline-flex; background-color: var(--bg-color); padding: 0.25rem;
    border-radius: 0.5rem; border: 1px solid var(--border-color);
}
.term-btn {
    padding: 0.375rem 1rem; border-radius: 0.375rem; font-size: 0.875rem; font-weight: 600;
    border: none; background-color: transparent; color: var(--secondary-text);
    cursor: pointer; transition: all 0.2s;
}
.term-btn.active {
    background-color: var(--accent-color); color: var(--accent-color-text);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}
.number-input-group { display: flex; align-items: center; }
.number-input-group button {
    width: 2.5rem; height: 2.5rem; font-weight: 700; font-size: 1.5rem;
    background-color: var(--surface-alt-color); color: var(--secondary-text);
    border: 1px solid var(--border-color); cursor: pointer; transition: background-color 0.2s;
}
.number-input-group button:hover { background-color: var(--border-color); }
.number-input-group button:first-child { border-radius: 0.5rem 0 0 0.5rem; }
.number-input-group button:last-child { border-radius: 0 0.5rem 0.5rem 0; }
.number-input-group input {
    width: 7rem; height: 2.5rem; text-align: center; font-weight: 600; font-size: 1rem;
    border: 1px solid var(--border-color); border-left: none; border-right: none;
    background-color: var(--surface-color); color: var(--primary-text);
    -moz-appearance: textfield;
}
.number-input-group input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.number-input-group input:focus { outline: none; box-shadow: inset 0 0 0 2px var(--accent-color); }
.range-group { 
    display: flex; align-items: center; gap: 0.5rem; justify-content: center;
    flex-wrap: wrap; 
}
.range-separator { color: var(--secondary-text); font-weight: 500; padding: 0 0.5rem; }
.checkbox-group { display: flex; align-items: center; gap: 0.75rem; cursor: pointer; font-weight: 500; color: var(--secondary-text); padding: 0.5rem; }
input[type="checkbox"] { width: 1.25em; height: 1.25em; accent-color: var(--accent-color); }

/* --- Generate Button --- */
.generate-section { text-align: center; padding-top: 1.5rem; border-top: 1px solid var(--border-color); }
.btn-primary {
    background-color: var(--accent-color); color: var(--accent-color-text);
    font-weight: 700; padding: 0.75rem 2.5rem; border-radius: 0.5rem;
    border: none; cursor: pointer; transition: all 0.3s;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1); display: inline-flex;
    align-items: center; justify-content: center; min-height: 48px; width: 100%;
}
@media (min-width: 640px) { .btn-primary { width: auto; } }
.btn-primary:hover { opacity: 0.9; box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1); transform: translateY(-2px); }
.btn-primary:disabled { background-color: var(--secondary-text); opacity: 0.7; cursor: not-allowed; transform: none; box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1);}
.spinner { height: 1.25rem; width: 1.25rem; animation: spin 1s linear infinite; }
@keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
.hidden { display: none; }

/* --- Result Area --- */
.result-container {
    background-color: var(--surface-alt-color); border: 1px solid var(--border-color);
    border-radius: 0.5rem; padding: 1.5rem; margin-top: 2rem;
    min-height: 200px; display: flex; align-items: center; justify-content: center;
}
.result-container p { color: var(--secondary-text); }
.error-text { color: var(--error-text-color); font-weight: 600; }
.result-content {
    font-family: monospace; font-size: 1.125rem; text-align: left; width: 100%;
    display: flex; flex-direction: column; gap: 1.5rem; word-break: break-all;
}
.result-set { background-color: var(--surface-color); padding: 1rem; border-radius: 0.5rem; border: 1px solid var(--border-color); }
.result-set .set-title { font-size: 1.25rem; font-weight: 700; margin-bottom: 0.5rem; color: var(--secondary-text); }
.result-set .equations-block { display: flex; flex-direction: column; gap: 0.5rem; color: var(--primary-text); }
.result-set hr { border-color: var(--border-color); opacity: 0.5; margin: 0.75rem 0; }
.result-set .set-total, .result-set .set-surcharge, .result-set .set-grand-total {
    display: flex; justify-content: space-between;
}
.result-set .set-total { font-weight: 500; color: var(--secondary-text); }
.result-set .set-surcharge { font-weight: 500; color: var(--secondary-text); }
.result-set .set-grand-total { font-weight: 700; color: var(--accent-color); font-size: 1.25rem; margin-top: 0.25rem; }

/* --- Footer --- */
.footer-link { text-align: center; }
.footer-link a { color: var(--secondary-text); text-decoration: none; font-size: 0.875rem; }
.footer-link a:hover { text-decoration: underline; }
.page-footer { text-align: center; margin-top: 1.5rem; font-size: 0.875rem; color: var(--secondary-text); }