:root {
    --bg-color: #f8fafc;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --secondary: #e2e8f0;
    --secondary-hover: #cbd5e1;
    --card-bg: #ffffff;
    --border: #e2e8f0;
    --radius: 16px;
    --radius-sm: 8px;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    
    /* Risk Colors */
    --risk-green-bg: #f0fdf4;
    --risk-green-text: #166534;
    --risk-yellow-bg: #fffbeb;
    --risk-yellow-text: #b45309;
    --risk-red-bg: #fef2f2;
    --risk-red-text: #991b1b;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

.hidden {
    display: none !important;
}

/* App Header */
.app-header {
    background-color: var(--card-bg);
    padding: 20px;
    text-align: center;
    border-bottom: 1px solid var(--border);
}
.app-header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}
.app-header p {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* Navigation */
.app-nav {
    display: flex;
    overflow-x: auto;
    background: var(--card-bg);
    padding: 0 10px;
    border-bottom: 1px solid var(--border);
    -ms-overflow-style: none;  /* IE and Edge */
    scrollbar-width: none;  /* Firefox */
}
.app-nav::-webkit-scrollbar {
    display: none;
}
.nav-btn {
    flex: 1;
    background: none;
    border: none;
    padding: 15px 10px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-muted);
    cursor: pointer;
    white-space: nowrap;
    border-bottom: 2px solid transparent;
    transition: all 0.2s ease;
}
.nav-btn.active {
    color: var(--primary);
    border-bottom: 2px solid var(--primary);
}

/* Main Content */
.app-content {
    padding: 15px;
    max-width: 600px;
    margin: 0 auto;
    padding-bottom: 40px;
}
.tab-section {
    display: none;
    animation: fadeIn 0.3s ease;
}
.tab-section.active {
    display: block;
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Cards */
.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 15px;
    box-shadow: var(--shadow);
}
.card h2 {
    font-size: 1.125rem;
    margin-bottom: 15px;
    color: var(--text-main);
}
.result-card {
    background: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 100%);
    color: white;
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 15px;
    box-shadow: 0 10px 15px -3px rgb(59 130 246 / 0.4);
}
.result-card h2 {
    color: white;
    margin-bottom: 15px;
    font-size: 1.125rem;
}

/* Forms & Inputs */
.form-row {
    display: flex;
    gap: 15px;
    margin-bottom: 15px;
}
.input-group {
    flex: 1;
    display: flex;
    flex-direction: column;
    margin-bottom: 15px;
}
.form-row .input-group {
    margin-bottom: 0;
}
label {
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 5px;
    color: var(--text-muted);
}
input, select {
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    background-color: var(--bg-color);
    transition: border-color 0.2s;
    font-family: inherit;
    width: 100%;
}
input:focus, select:focus {
    outline: none;
    border-color: var(--primary);
}
.help-text {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 5px;
}

/* Result Grid */
.result-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}
.stat-box {
    background: rgba(255,255,255,0.1);
    padding: 12px;
    border-radius: var(--radius-sm);
    display: flex;
    flex-direction: column;
}
.stat-box.highlight {
    background: rgba(255,255,255,0.25);
    border: 1px solid rgba(255,255,255,0.5);
}
.stat-label {
    font-size: 0.75rem;
    opacity: 0.9;
    margin-bottom: 4px;
}
.stat-val {
    font-size: 1.25rem;
    font-weight: 700;
}

/* Dynamic Risk Block */
.risk-block {
    margin-top: 15px;
    padding: 12px;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
}
.risk-block.hidden {
    display: none;
}
.risk-block h3 {
    font-size: 1rem;
    margin-bottom: 4px;
}
.advice-text {
    font-weight: 600;
    margin-top: 8px;
}
.risk-norm { background: var(--risk-green-bg); color: var(--risk-green-text); }
.risk-warn { background: var(--risk-yellow-bg); color: var(--risk-yellow-text); }
.risk-crit { background: var(--risk-red-bg); color: var(--risk-red-text); }

/* Coffee Steppers */
.coffee-shots {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 10px;
}
.shot-control {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-color);
    padding: 10px 15px;
    border-radius: var(--radius-sm);
}
.shot-control span {
    font-weight: 500;
}
.stepper {
    display: flex;
    align-items: center;
    gap: 15px;
}
.stepper button {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    border: none;
    background: var(--secondary);
    color: var(--text-main);
    font-size: 1.2rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}
.stepper button:hover { background: var(--secondary-hover); }
.stepper span {
    font-weight: 600;
    min-width: 20px;
    text-align: center;
}

/* Quick Foods Chips */
.food-baza h4 {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 10px;
    margin-top: 15px;
}
.chip-container {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
.chip {
    background: var(--secondary);
    color: var(--text-main);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.875rem;
    cursor: pointer;
    border: none;
    transition: background 0.2s;
}
.chip:hover {
    background: var(--secondary-hover);
}

/* Buttons */
.btn-primary, .btn-secondary {
    width: 100%;
    padding: 14px;
    border-radius: var(--radius-sm);
    border: none;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.1s, background 0.2s;
}
.btn-primary {
    background: var(--primary);
    color: white;
    margin-top: 10px;
}
.btn-primary:active { transform: scale(0.98); }
.btn-secondary {
    background: var(--secondary);
    color: var(--text-main);
}
.btn-secondary:active { transform: scale(0.98); }

/* Table */
.table-responsive {
    overflow-x: auto;
}
table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}
th, td {
    padding: 10px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    white-space: nowrap;
}
th {
    color: var(--text-muted);
    font-weight: 500;
}
.stat-summary .stat-box {
    background: var(--bg-color);
    color: var(--text-main);
    border: 1px solid var(--border);
}
.stat-summary .stat-label {
    color: var(--text-muted);
}

/* Language Switcher */
.lang-switcher .lang-btn:hover {
    background: rgba(255,255,255,0.4);
}
.lang-switcher .lang-btn.active {
    background: var(--primary);
    color: white !important;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}