:root {
    --primary: hsl(220, 90%, 56%);
    --primary-hover: hsl(220, 90%, 46%);
    --bg: hsl(210, 20%, 98%);
    --surface: hsl(0, 0%, 100%);
    --text-main: hsl(220, 20%, 20%);
    --text-muted: hsl(220, 10%, 45%);
    --border: hsl(220, 15%, 90%);
    --danger: hsl(348, 83%, 47%);
    --success: hsl(141, 71%, 48%);
    
    --radius: 8px;
    --shadow: 0 4px 6px -1px hsl(0 0% 0% / 0.1), 0 2px 4px -2px hsl(0 0% 0% / 0.1);
    --shadow-lg: 0 10px 15px -3px hsl(0 0% 0% / 0.1), 0 4px 6px -4px hsl(0 0% 0% / 0.1);
}

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

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

.hidden {
    display: none !important;
}

/* Header */
.app-header {
    background-color: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 10;
}
.header-container {
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.header-container h1 {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}
#main-nav {
    display: flex;
    gap: 1rem;
}
.nav-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius);
    transition: all 0.2s ease;
}
.nav-btn:hover, .nav-btn.active {
    color: var(--primary);
    background-color: var(--bg);
}

/* Layout */
#app-content {
    max-width: 1000px;
    margin: 2rem auto;
    padding: 0 2rem;
    min-height: 70vh;
}

/* Components */
.card {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    margin-bottom: 1.5rem;
}

.card-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    letter-spacing: -0.01em;
}

/* Forms */
.form-group {
    margin-bottom: 1.25rem;
}
.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}
.form-control {
    width: 100%;
    padding: 0.6rem 0.8rem;
    font-size: 1rem;
    font-family: inherit;
    border: 1px solid var(--border);
    border-radius: 6px;
    background-color: var(--surface);
    transition: border-color 0.2s, box-shadow 0.2s;
}
.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px hsl(220 90% 56% / 0.15);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.6rem 1.2rem;
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid transparent;
}
.btn-primary {
    background-color: var(--primary);
    color: white;
}
.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}
.btn-block {
    width: 100%;
}

.error-text {
    color: var(--danger);
    font-size: 0.85rem;
    margin-top: 0.25rem;
    display: block;
}

/* --- Responsive 3-Tier Breakpoints --- */

/* Tablet (Medium) */
@media (max-width: 1024px) {
    #app-content {
        padding: 0 1.5rem;
    }
    
    .card {
        padding: 1.5rem;
    }
}

/* Mobile (Small) */
@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    #main-nav {
        flex-wrap: wrap;
        justify-content: center;
    }

    #app-content {
        margin: 1rem auto;
        padding: 0 1rem;
    }
    
    .card {
        padding: 1rem;
    }
    
    .header-container h1 {
        font-size: 1.5rem;
    }
}

/* Responsive Layouts */
.responsive-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.responsive-layout {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

@media (min-width: 768px) {
    .responsive-layout {
        flex-direction: row;
    }
}


/* =========================================================================
   Mobile UI Refactor Styles
   ========================================================================= */

/* Hamburger Button */
.hamburger-btn {
    background: transparent;
    border: none;
    color: var(--text);
    cursor: pointer;
    padding: 0.5rem;
    display: none;
}

@media (max-width: 767px) {
    .hamburger-btn {
        display: block;
    }
    
    /* Hide the original nav layout when hamburger is active (already handled by Drawer styles, 
       but we ensure the button replaces the row layout) */
    .header-container > nav#main-nav:not(.Drawer-sheet) {
        display: none !important;
    }
}

/* -------------------------------------------------------------------------
   Navigation Drawer (popover)
   Based on modern-web-guidance for navigation-drawer
   ------------------------------------------------------------------------- */
.Drawer {
    --drawer-width: min(20em, 80dvw);
    --drawer-backdrop: 0;

    width: auto;
    height: auto;
    background: transparent;
    border: 0;
    overflow: visible;
}

.Drawer::backdrop {
    background: #000;
    opacity: calc(var(--drawer-backdrop) / 2);
}

.Drawer-scroller {
    position: relative;
    display: grid;
    grid-template-columns: var(--drawer-width) 100%;
    overflow-x: scroll;
    overscroll-behavior: none;
    scrollbar-width: none;
    scroll-snap-type: x mandatory;
}
.Drawer-scroller::-webkit-scrollbar {
    display: none;
}

@media (prefers-reduced-motion: no-preference) {
    .Drawer-scroller {
        scroll-behavior: smooth;
    }
}

.Drawer-scroller::after {
    content: '';
    scroll-snap-align: end;
    scroll-initial-target: nearest;
}

.Drawer-sheet:not(.hidden) {
    display: grid;
    grid-template-rows: auto 1fr;
    height: 100svh;
    background: var(--bg);
    color: var(--text);
    overflow-y: auto;
    scroll-snap-align: start;
    scrollbar-width: none;
    
    /* Convert the original row of buttons to a column */
    display: flex;
    flex-direction: column;
    padding: 2rem 1rem;
    gap: 1rem;
    align-items: flex-start;
}
.Drawer-sheet::-webkit-scrollbar {
    display: none;
}

@supports (animation-timeline: scroll()) {
    .Drawer {
        timeline-scope: --drawer-fade;
        animation: fade-drawer-backdrop linear both;
        animation-timeline: --drawer-fade;
    }
    .Drawer-scroller {
        scroll-timeline: --drawer-fade x;
    }
    @property --drawer-backdrop {
        syntax: '<number>';
        inherits: true;
        initial-value: 0;
    }
    @keyframes fade-drawer-backdrop {
        0% { --drawer-backdrop: 1; }
        100% { --drawer-backdrop: 0; }
    }
}

/* -------------------------------------------------------------------------
   Goal Details (Accordion)
   ------------------------------------------------------------------------- */
.goal-details summary {
    list-style: none; /* Hide default triangle */
}
.goal-details summary::-webkit-details-marker {
    display: none;
}
/* Add a custom icon for expansion (optional) */
.expand-icon::before {
    content: '+';
    display: block;
}
.goal-details[open] .expand-icon {
    transform: rotate(180deg);
}
.goal-details[open] .expand-icon::before {
    content: '-';
}

/* -------------------------------------------------------------------------
   Responsive Grid (Settings & Admin)
   ------------------------------------------------------------------------- */
.responsive-grid {
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
}


/* -------------------------------------------------------------------------
   Desktop Overrides for Drawer (Keep as normal nav row on desktop)
   ------------------------------------------------------------------------- */
@media (min-width: 768px) {
    .Drawer {
        display: block !important;
        position: static !important;
        margin: 0 !important;
        padding: 0 !important;
        border: none !important;
        background: transparent !important;
        width: auto !important;
        height: auto !important;
        overflow: visible !important;
        inset: auto !important;
    }
    .Drawer::backdrop {
        display: none !important;
    }
    .Drawer-scroller {
        display: block !important;
        overflow: visible !important;
    }
    .Drawer-sheet:not(.hidden) {
        display: flex !important;
        flex-direction: row !important;
        height: auto !important;
        padding: 0 !important;
        background: transparent !important;
        color: inherit !important;
        overflow: visible !important;
        align-items: center;
    }
}