/* ═══════════════════════════════════════════════════════
   LPCalc — Web Application Styles
   Premium dark-themed design with glassmorphism
   ═══════════════════════════════════════════════════════ */

/* ── Reset & Base ── */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-primary: #0f1117;
    --bg-secondary: #181b24;
    --bg-card: #1e2230;
    --bg-card-alt: #252a3a;
    --bg-input: #2a2f42;
    --bg-highlight: #32384e;
    --text-primary: #e8eaf0;
    --text-secondary: #9ba1b5;
    --text-muted: #6b7186;
    --accent-green: #22c55e;
    --accent-green-glow: rgba(34, 197, 94, 0.25);
    --accent-red: #ef4444;
    --accent-red-glow: rgba(239, 68, 68, 0.2);
    --accent-blue: #3b82f6;
    --accent-blue-glow: rgba(59, 130, 246, 0.2);
    --accent-amber: #f59e0b;
    --accent-amber-glow: rgba(245, 158, 11, 0.2);
    --accent-purple: #a855f7;
    --border-color: #2e3348;
    --border-glow: rgba(59, 130, 246, 0.3);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    font-size: 15px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ── Login Overlay ── */
.login-overlay {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #0f1117 0%, #1a1e2e 50%, #0f1117 100%);
    backdrop-filter: blur(12px);
}

.login-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 3rem 2.5rem;
    width: min(420px, 92vw);
    text-align: center;
    box-shadow: var(--shadow-lg), 0 0 80px rgba(59, 130, 246, 0.06);
    animation: slideUp 0.5s ease-out;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(30px) scale(0.97); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.login-icon {
    font-size: 3rem;
    margin-bottom: 0.5rem;
    filter: drop-shadow(0 0 12px rgba(59, 130, 246, 0.4));
}

.login-card h1 {
    font-size: 1.8rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.25rem;
}

.login-divider {
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple));
    border-radius: 4px;
    margin: 0.75rem auto 1.5rem;
}

.login-field {
    text-align: left;
    margin-bottom: 1.5rem;
}

.login-field label {
    display: block;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.login-field input {
    width: 100%;
    padding: 0.85rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-input);
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 1.05rem;
    text-align: center;
    letter-spacing: 0.15em;
    transition: var(--transition);
}

.login-field input:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px var(--accent-blue-glow);
}

.login-buttons {
    display: flex;
    gap: 0.75rem;
}

.login-error {
    color: var(--accent-red);
    font-size: 0.85rem;
    font-weight: 600;
    margin-top: 1rem;
    animation: shake 0.4s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-6px); }
    75% { transform: translateX(6px); }
}

/* ── App Container ── */
.app-container {
    max-width: 960px;
    margin: 0 auto;
    padding: 1.5rem 1rem 2rem;
    animation: fadeIn 0.4s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* ── Header ── */
.app-header {
    text-align: center;
    margin-bottom: 1.5rem;
    padding: 1.25rem;
    background: linear-gradient(135deg, var(--bg-card) 0%, var(--bg-card-alt) 100%);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.app-title {
    font-size: 1.65rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent-green), #4ade80);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.app-subtitle {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

/* ── Action Bar ── */
.action-bar {
    display: flex;
    gap: 0.6rem;
    margin-bottom: 1.25rem;
    flex-wrap: wrap;
}

/* ── Buttons ── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.65rem 1.25rem;
    font-family: var(--font-family);
    font-size: 0.88rem;
    font-weight: 600;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.btn:active {
    transform: scale(0.97);
}

.btn-success {
    background: linear-gradient(135deg, #16a34a, var(--accent-green));
    color: #fff;
    border-color: var(--accent-green);
    box-shadow: 0 2px 12px var(--accent-green-glow);
}

.btn-success:hover {
    box-shadow: 0 4px 20px var(--accent-green-glow);
    filter: brightness(1.1);
}

.btn-danger {
    background: linear-gradient(135deg, #dc2626, var(--accent-red));
    color: #fff;
    border-color: var(--accent-red);
    box-shadow: 0 2px 12px var(--accent-red-glow);
}

.btn-danger:hover {
    box-shadow: 0 4px 20px var(--accent-red-glow);
    filter: brightness(1.1);
}

.btn-outline-warn {
    background: transparent;
    color: var(--accent-amber);
    border: 1px solid var(--accent-amber);
}

.btn-outline-warn:hover {
    background: var(--accent-amber-glow);
    box-shadow: 0 0 16px var(--accent-amber-glow);
}

.btn-outline-accent {
    background: transparent;
    color: var(--accent-blue);
    border: 1px solid var(--accent-blue);
}

.btn-outline-accent:hover {
    background: var(--accent-blue-glow);
    box-shadow: 0 0 16px var(--accent-blue-glow);
}

.btn-outline-success {
    background: transparent;
    color: var(--accent-green);
    border: 1px solid var(--accent-green);
}

.btn-outline-success:hover {
    background: var(--accent-green-glow);
    box-shadow: 0 0 16px var(--accent-green-glow);
}

.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    flex: 1;
}

.btn-sm {
    padding: 0.4rem 0.75rem;
    font-size: 0.82rem;
    border-radius: var(--radius-sm);
    background: var(--bg-input);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-sm:hover {
    background: var(--bg-highlight);
}

.btn-block {
    width: 100%;
    margin-top: 0.75rem;
}

.btn-icon {
    font-size: 1.1rem;
}

/* ── Cards ── */
.main-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
}

@media (max-width: 700px) {
    .main-grid {
        grid-template-columns: 1fr;
    }
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    padding: 0.75rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-card-alt);
}

.card-header h2 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
}

.card-body {
    padding: 1.25rem;
}

/* ── Form Fields ── */
.field-group {
    margin-bottom: 1rem;
}

.field-group label,
.section-label {
    display: block;
    font-weight: 600;
    font-size: 0.82rem;
    color: var(--text-secondary);
    margin-bottom: 0.4rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.field-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.35rem;
}

.sub-label {
    font-size: 0.84rem !important;
    font-weight: 600 !important;
    color: var(--text-secondary) !important;
    text-transform: none !important;
    letter-spacing: 0 !important;
    min-width: 80px;
    margin-bottom: 0 !important;
}

.input-field,
.select-field {
    padding: 0.6rem 0.8rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-input);
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 0.95rem;
    font-weight: 600;
    transition: var(--transition);
    text-align: center;
    flex: 1;
    min-width: 0;
}

.select-field {
    cursor: pointer;
    appearance: auto;
}

.select-dark {
    background: #3a3f55;
}

.input-highlight {
    background: #3a2e1f;
    border-color: var(--accent-amber);
}

.input-field:focus,
.select-field:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px var(--accent-blue-glow);
}

.unit {
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--text-muted);
    min-width: 24px;
}

.field-highlight {
    background: var(--bg-card-alt);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.75rem;
}

/* ── Remainder Panel ── */
.remainder-panel {
    background: linear-gradient(135deg, #2a1f0f, #1e2230);
    border: 1px solid #4a3520;
    border-radius: var(--radius-md);
    padding: 0.75rem;
    margin-top: 1rem;
}

.remainder-row {
    display: flex;
    align-items: center;
    padding: 0.3rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.remainder-row:last-child {
    border-bottom: none;
}

.rem-label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--accent-green);
    flex: 1;
}

.rem-value {
    font-size: 1.05rem;
    font-weight: 800;
    color: var(--accent-red);
    margin-right: 0.35rem;
}

.rem-unit {
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--text-muted);
}

/* ── Total Panel ── */
.total-panel {
    background: linear-gradient(135deg, #1f2a0f, #1e2a17);
    border: 2px solid var(--accent-green);
    border-radius: var(--radius-md);
    padding: 0.85rem 1rem;
    margin-top: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    box-shadow: 0 0 20px var(--accent-green-glow);
    animation: glowPulse 2s ease-in-out infinite alternate;
}

@keyframes glowPulse {
    from { box-shadow: 0 0 12px var(--accent-green-glow); }
    to { box-shadow: 0 0 28px var(--accent-green-glow); }
}

.total-label {
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--accent-green);
}

.total-value {
    font-weight: 800;
    font-size: 1.3rem;
    color: #fff;
}

/* ── Results ── */
.result-row {
    display: flex;
    align-items: center;
    padding: 0.65rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    transition: var(--transition);
}

.result-row:hover {
    background: rgba(255, 255, 255, 0.02);
    border-radius: var(--radius-sm);
}

.result-row:last-child {
    border-bottom: none;
}

.res-label {
    font-size: 0.84rem;
    font-weight: 600;
    color: var(--text-secondary);
    flex: 1;
}

.res-value {
    font-size: 1.15rem;
    font-weight: 800;
    color: var(--accent-green);
    min-width: 40px;
    text-align: right;
}

.res-extra {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--accent-green);
    margin-left: 0.5rem;
    opacity: 0.8;
}

.result-detail {
    font-size: 0.78rem;
    color: var(--accent-red);
    padding: 0 0 0.35rem 1rem;
    font-weight: 500;
    opacity: 0.9;
    min-height: 0.78rem;
}

/* ── Modals ── */
.modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 900;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(6px);
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.2s ease;
}

.modal-content {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    animation: slideUp 0.3s ease-out;
    max-height: 92vh;
    overflow-y: auto;
}

.modal-schema {
    width: min(850px, 95vw);
}

.modal-prices {
    width: min(440px, 92vw);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-card-alt);
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.modal-header h2 {
    font-size: 1.05rem;
    font-weight: 700;
}

.modal-body {
    padding: 1.5rem;
}

/* ── Schema Canvas ── */
.schema-legend {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    padding: 0.6rem 1.5rem;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.legend-color {
    width: 14px;
    height: 4px;
    border-radius: 2px;
    display: inline-block;
}

.canvas-wrapper {
    padding: 1rem;
    background: #ffffff;
    border-radius: 0 0 var(--radius-xl) var(--radius-xl);
    overflow: auto;
    max-height: 70vh;
}

.schema-controls {
    display: flex;
    gap: 0.4rem;
}

/* ── Price Fields ── */
.price-field {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    margin-bottom: 0.85rem;
}

.price-field label {
    font-weight: 600;
    font-size: 0.88rem;
    color: var(--text-secondary);
    min-width: 100px;
}

.price-field .input-field {
    flex: 1;
}

/* ── Footer ── */
.app-footer {
    text-align: center;
    padding: 1.5rem 1rem;
    margin-top: 1.5rem;
    font-size: 0.75rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border-color);
}

/* ── Notification Toast ── */
.toast {
    position: fixed;
    top: 1.5rem;
    right: 1.5rem;
    z-index: 2000;
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-md);
    font-size: 0.88rem;
    font-weight: 600;
    color: #fff;
    box-shadow: var(--shadow-md);
    animation: toastIn 0.35s ease-out;
    pointer-events: none;
}

.toast-success {
    background: linear-gradient(135deg, #16a34a, var(--accent-green));
}

.toast-error {
    background: linear-gradient(135deg, #dc2626, var(--accent-red));
}

.toast-info {
    background: linear-gradient(135deg, #2563eb, var(--accent-blue));
}

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

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

/* ── Scrollbar ── */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--bg-highlight);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}