:root {
    --primary: #2c3e50;
    --accent: #e74c3c;
    --accent-hover: #c0392b;
    --secondary: #3498db;
    --success: #27ae60;
    --success-hover: #219e50;
    --gray: #95a5a6;
    --light-gray: #ecf0f1;
    --text: #2c3e50;
    --container-bg: white;
    --shadow: 0 10px 25px rgba(0,0,0,0.25);
    --border-radius: 18px;
    --transition: all 0.3s ease;
}

body.dark-mode {
    --primary: #ecf0f1;
    --text: #ecf0f1;
    --success: #27ae60;
    --container-bg: #1E123C;
    --shadow: 0 10px 25px rgba(0,0,0,0.4);
}

.tip-container {
    max-width: 100%;
    margin: auto;
    background: var(--container-bg);
    border-radius: 0;
    padding: 50px 30px;
    overflow: hidden;
    position: relative;
    transition: background 0.5s;
}

.theme-toggle {
    position: absolute;
    top: 5px;
    right: 35px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
    cursor: pointer;
    z-index: 10;
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(5px);
    padding: 8px 12px;
    border-radius: 20px;
    border: 1px solid rgba(255,255,255,0.2);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.tip-calculator-title-suite{
    color:#e74c3ce6 !important;
}

.tip-calculator-title{
    color:#ffffff !important;
}

body.dark-mode .theme-toggle {
    background: rgba(0,0,0,0.3);
    border-color: rgba(255,255,255,0.1);
}

.theme-toggle .sun { opacity: 1; }
.theme-toggle .moon { opacity: 0.25; }
body.dark-mode .theme-toggle .sun { opacity: 0.25; }
body.dark-mode .theme-toggle .moon { opacity: 1; }

.tool-wrapper {
    width: 100%;
    max-width: 82rem;
    margin-left: auto;
    margin-right: auto;
    display: grid;
    grid-template-columns: repeat(1, minmax(0, 1fr));
    gap: 2rem;
    align-items: start;
    padding-bottom: 30px;
}

@media (min-width: 1024px) {
    .tool-wrapper { grid-template-columns: repeat(12, minmax(0, 1fr)); }
}

.controls {
    color: var(--text);
    border-radius: 1rem;
    box-shadow: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
    padding: 1.5rem;
    border: 1px solid #e5e7eb;
}

@media (min-width: 1024px) {
    .controls { grid-column: span 6 / span 6; }
}

body.dark-mode .controls { border-color: rgba(255,255,255,0.1); }

.calculator-modes {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    margin-bottom: 30px;
}

.mode-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 16px;
    background: white;
    border: 2px solid #bdc3c7;
    border-radius: 12px;
    color: var(--text);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

body.dark-mode .mode-btn { background: #2c2c3e; border-color: #555; }

.mode-btn:hover {
    border-color: var(--accent);
    background: rgba(231,76,60,0.05);
    transform: translateY(-2px);
}

.mode-btn.active {
    background: var(--accent) !important;
    border-color: var(--accent) !important;
    color: white;
}

.mode-btn svg { flex-shrink: 0; }

.calc-mode { display: none; }
.calc-mode.active { display: block; animation: fadeIn 0.3s ease; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to   { opacity: 1; transform: translateY(0); }
}

.mode-title { font-size: 1.4rem; color: var(--text) !important; margin-bottom: 8px; font-weight: 700; }
.mode-description { color: var(--text); opacity: 0.7; margin-bottom: 25px; font-size: 0.95rem; }

.input-group { margin-bottom: 20px; position: relative; }
.input-group label { display: block; font-size: 0.95rem; font-weight: 600; color: var(--text); margin-bottom: 8px; }

.calc-input {
    width: 100%;
    font-size: 1.1rem;
    font-weight: 600;
    border: 2px solid #bdc3c7;
    border-radius: 12px;
    background: white;
    color: var(--text);
    transition: var(--transition);
    box-sizing: border-box;
}

body.dark-mode .calc-input { background: #2c2c3e; border-color: #555; color: #fff; }

.calc-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(231,76,60,0.1);
}

/* Tip % quick buttons */
.tip-percent-btns {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.pct-btn {
    flex: 1;
    padding: 10px 6px;
    background: white;
    border: 2px solid #bdc3c7;
    border-radius: 10px;
    color: var(--text);
    font-size: 0.9rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    min-width: 48px;
}

body.dark-mode .pct-btn { background: #2c2c3e; border-color: #555; color: #fff; }

.pct-btn:hover { border-color: var(--accent); background: rgba(231,76,60,0.05); }
.pct-btn.active { background: var(--accent) !important; border-color: var(--accent); color: white; }

/* People counter */
.people-counter {
    display: flex;
    align-items: center;
    gap: 10px;
}

.counter-btn {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    border: 2px solid #bdc3c7;
    background: white;
    color: var(--text);
    font-size: 1.4rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

body.dark-mode .counter-btn { background: #2c2c3e; border-color: #555; color: #fff; }
.counter-btn:hover { border-color: var(--accent); background: rgba(231,76,60,0.05); }

.counter-input { text-align: center; flex: 1; }

/* Quality buttons */
.quality-btns {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.quality-btn {
    flex: 1;
    min-width: 60px;
    padding: 12px 6px;
    background: white;
    border: 2px solid #bdc3c7;
    border-radius: 12px;
    color: var(--text);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

body.dark-mode .quality-btn { background: #2c2c3e; border-color: #555; color: #fff; }
.quality-btn:hover { border-color: var(--accent); transform: translateY(-2px); }
.quality-btn.active { background: var(--accent); border-color: var(--accent); color: white; }

.quality-emoji { font-size: 1.4rem; }
.quality-label { font-size: 0.75rem; font-weight: 700; }
.quality-pct { font-size: 0.8rem; opacity: 0.85; }

/* Calculate Button */
.calculate-btn {
    width: 100%;
    padding: 16px;
    background: var(--success);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.15);
    margin-bottom: 20px;
}

.calculate-btn:hover { opacity: 0.9; transform: translateY(-2px); }
.calculate-btn:active { transform: translateY(0); }
.calculate-btn.calculating { animation: pulse 0.3s ease-in-out; }

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50%       { transform: scale(0.98); }
}

/* Result Box */
.result-box {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 25px;
    border-radius: 16px;
    text-align: center;
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
    margin-bottom: 20px;
}

.result-main { font-size: 3rem; font-weight: 700; color: white; margin-bottom: 10px; text-shadow: 0 2px 4px rgba(0,0,0,0.2); }
.result-formula { font-size: 1.1rem; color: rgba(255,255,255,0.9); margin-bottom: 8px; font-weight: 500; }
.result-detail { font-size: 0.95rem; color: rgba(255,255,255,0.8); font-weight: 500; margin-bottom: 5px; }
.result-detail:last-child { margin-bottom: 0; }

/* History */
.calculation-history { margin-top: 30px; padding-top: 30px; border-top: 2px solid rgba(0,0,0,0.1); }
body.dark-mode .calculation-history { border-top-color: rgba(255,255,255,0.1); }
.calculation-history p { font-size: 18px; margin-bottom: 15px; color: var(--text) !important; font-weight: 600; }

#tipHistoryList { max-height: 300px; overflow-y: auto; margin-bottom: 15px; }
#tipHistoryList::-webkit-scrollbar { width: 6px; }
#tipHistoryList::-webkit-scrollbar-track { background: rgba(0,0,0,0.05); border-radius: 3px; }
body.dark-mode #tipHistoryList::-webkit-scrollbar-track { background: rgba(255,255,255,0.05); }
#tipHistoryList::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 3px; }

.no-history { text-align: center; padding: 20px; color: var(--text); opacity: 0.5; font-style: italic; }

.history-item { background: rgba(0,0,0,0.03); padding: 12px; border-radius: 8px; margin-bottom: 10px; transition: all 0.3s; cursor: pointer; }
body.dark-mode .history-item { background: rgba(255,255,255,0.05); }
.history-item:hover { background: rgba(0,0,0,0.06); transform: translateX(5px); }
body.dark-mode .history-item:hover { background: rgba(255,255,255,0.08); }

.history-header { display: flex; justify-content: space-between; margin-bottom: 8px; font-size: 12px; opacity: 0.7; }
.history-time { color: var(--text); }
.history-mode { font-weight: 600; color: var(--accent); }
.history-calculation { font-size: 14px; color: var(--text); font-weight: 500; }

.clear-btn { width: 100%; padding: 10px; background: var(--accent); color: white; border: none; border-radius: 8px; font-weight: 600; cursor: pointer; transition: all 0.3s; font-size: 14px; }
.clear-btn:hover { opacity: 0.9; transform: translateY(-2px); }

/* Info Display */
.info-display-container { display: flex; flex-direction: column; gap: 30px; }

@media (min-width: 1024px) {
    .info-display-container { grid-column: span 6 / span 6; }
}

.steps-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

.step {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 14px;
    background: var(--container-bg);
    border-radius: 14px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.06);
    transition: all 0.3s ease;
    text-align: left;
    border: 1px solid #e5e7eb;
}

body.dark-mode .step { border-color: rgba(255,255,255,0.1); }
.step:hover { transform: translateY(-3px); box-shadow: 0 6px 14px rgba(0,0,0,0.12); }

.step-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: #d70932;
    color: white;
    font-weight: bold;
    border-radius: 50%;
    flex-shrink: 0;
    font-size: 15px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

.step p { margin: 0; font-size: 13px; color: var(--text); }
.steps-grid-mobile { display: none; }

.info-section { display: grid; grid-template-columns: 1fr; gap: 20px; }

.info-card {
    background: var(--container-bg);
    padding: 25px;
    border-radius: var(--border-radius);
    box-shadow: 0 3px 10px rgba(0,0,0,0.06);
    border: 1px solid #e5e7eb;
}

body.dark-mode .info-card { border-color: rgba(255,255,255,0.1); }
.info-card p { font-size: 1.2rem; margin-bottom: 15px; color: var(--text) !important; }
.info-card ul { list-style: none; padding: 0; margin: 0; }
.info-card li { padding: 8px 0; padding-left: 25px; position: relative; color: var(--text); line-height: 1.6; }
.info-card li::before { content: '✓'; position: absolute; left: 0; color: var(--success); font-weight: bold; }
.info-card li strong { color: var(--accent); }

/* Mobile */
@media (max-width: 768px) {
    .tip-container { padding: 50px 0; }
    .controls { margin-top: 0; border: none !important; box-shadow: none !important; }
    .tool-wrapper { width: 95%; gap: 0 !important; }
    .calculator-modes { grid-template-columns: repeat(2, 1fr); gap: 8px; }
    .mode-btn { padding: 10px 8px; font-size: 0.85rem; }
    .result-main { font-size: 2.5rem; }
    .steps-grid { display: none; }
    .steps-grid-mobile { display: block !important; padding-bottom: 50px; }
    .steps-grid-mobile .step { margin-bottom: 16px; }
    .info-section { padding: 0 10px; }
    .quality-btns { gap: 5px; }
    .quality-btn { min-width: 50px; padding: 10px 4px; }
}

@media (max-width: 480px) {
    .mode-btn { font-size: 0.75rem; padding: 8px 6px; }
    .mode-btn svg { width: 16px; height: 16px; }
    .result-main { font-size: 2rem; }
    .result-formula { font-size: 1rem; }
    .pct-btn { font-size: 0.8rem; padding: 8px 4px; }
}