/* ==========================================================================
   Logbook — 90s High School Planner
   ========================================================================== */

/* --- Layout Override --- */
main:has(.logbook) {
    max-inline-size: none;
    padding: 0;
}

/* --- Holographic Cover Animation --- */
@property --holo-angle {
    syntax: "<angle>";
    initial-value: 0deg;
    inherits: false;
}

@keyframes holo-rotate {
    to { --holo-angle: 360deg; }
}

/* --- Logbook Container --- */
.logbook {
    position: relative;
    min-block-size: 100dvh;
    padding: 2rem 1.5rem;
}

/* Holographic iridescent cover */
.logbook::before {
    content: "";
    position: absolute;
    inset: 0;
    background: conic-gradient( from var(--holo-angle), #0ff, #8000ff, #ff0080, #cc7f32, #0ff );
    mix-blend-mode: screen;
    opacity: 0.5;
    pointer-events: none;
    z-index: 0;
    animation: holo-rotate 30s linear infinite;
}

/* --- Planner Shell --- */
.planner {
    position: relative;
    z-index: 1;
    display: flex;
    max-inline-size: 52rem;
    margin-inline: auto;
}

/* --- Spiral Binding --- */
.planner-binding {
    --coil-edge: 2rem;
    --coil-overlap: 0.5rem;
    flex-shrink: 0;
    inline-size: var(--coil-edge);
    position: relative;
    z-index: 1;
}

/* Coil arcs — C-shaped loops contained within binding */
.planner-binding::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        radial-gradient(
            circle at 100% 50%,
            transparent 0.45rem,
            #909098 0.45rem,
            #c0c0c8 0.5rem,
            #e8e8f0 0.6rem,
            #c0c0c8 0.7rem,
            #909098 0.75rem,
            transparent 0.75rem
        );
    background-size: 100% 1.75rem;
}

/* Bottom of each coil — curves down past the page edge into the body */
.planner-binding::after {
    content: "";
    position: absolute;
    inset-block: 0;
    inset-inline-end: calc(-1 * var(--coil-overlap));
    inline-size: var(--coil-overlap);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 10 35'%3E%3Cdefs%3E%3ClinearGradient id='w' x1='0' y1='0' x2='0' y2='1'%3E%3Cstop offset='0' stop-color='%23909098'/%3E%3Cstop offset='.2' stop-color='%23c0c0c8'/%3E%3Cstop offset='.5' stop-color='%23e8e8f0'/%3E%3Cstop offset='.8' stop-color='%23c0c0c8'/%3E%3Cstop offset='1' stop-color='%23909098'/%3E%3C/linearGradient%3E%3C/defs%3E%3Cpath d='M0 26.5Q5 27.25 10 28.5L10 34Q5 33.5 0 32.5Z' fill='url(%23w)'/%3E%3C/svg%3E");
    background-size: var(--coil-overlap) 1.75rem;
    background-repeat: repeat-y;
    pointer-events: none;
}

/* --- Planner Body --- */
.planner-body {
    flex: 1;
    min-inline-size: 0;
    background-color: #12121c;
    box-shadow:
        0 2px 20px rgba(0, 0, 0, 0.5),
        0 0 60px rgba(0, 0, 0, 0.3);
}

/* --- Planner Cover (Header) --- */
.planner-cover {
    padding: 2rem 2rem 1rem;
    border-block-end: 1px solid rgba(100, 100, 160, 0.15);
}

.planner-cover h1 {
    font-size: 2rem;
    color: var(--cyan);
    text-shadow: 0 0 12px rgba(0, 229, 255, 0.5), 0 0 30px rgba(0, 229, 255, 0.15);
    margin-block-end: 0.25rem;
}

.planner-cover p {
    font-family: 'Courier New', 'Lucida Console', monospace;
    font-size: 0.875rem;
    color: var(--text-dim);
    letter-spacing: 0.05em;
    margin: 0;
}

/* --- Loading & Empty States --- */
.logbook-loading,
.logbook-empty {
    font-family: 'Courier New', 'Lucida Console', monospace;
    font-size: 0.875rem;
    color: var(--text-dim);
    padding: 2rem;
    letter-spacing: 0.05em;
}

/* --- Navigation Bar --- */
.planner-nav-bar {
    background-color: #0e0e16;
}

/* --- Year Label — DYMO label-maker tape --- */
.planner-year-label {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    padding: 0.6rem 2rem;
}

.planner-year-text {
    font-family: 'Courier New', 'Lucida Console', monospace;
    font-size: 0.875rem;
    font-weight: bold;
    letter-spacing: 0.25em;
    color: #e8e8f0;
    background: linear-gradient(180deg, #2a2a3a 0%, #1e1e2e 100%);
    padding: 0.25rem 1.25rem;
    border: 1px solid rgba(100, 100, 160, 0.25);
    /* Embossed tape effect */
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.06),
        inset 0 -1px 0 rgba(0, 0, 0, 0.3),
        0 1px 2px rgba(0, 0, 0, 0.4);
}

.planner-year-arrow {
    font-size: 0.5rem;
    color: var(--text-dim);
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.25rem;
    line-height: 1;
    transition: color 0.2s ease;
}

.planner-year-arrow:hover {
    color: var(--accent);
}

/* --- Month Divider Tabs — plastic tab separators --- */
.planner-dividers {
    display: flex;
    padding: 0 2rem;
    /* Tabs sit flush against the calendar below, no gap */
}

.planner-divider {
    flex: 1;
    position: relative;
    padding: 0.5rem 0 0.35rem;
    font-family: 'Courier New', 'Lucida Console', monospace;
    font-size: 0.625rem;
    letter-spacing: 0.06em;
    text-align: center;
    cursor: pointer;
    user-select: none;
    border: none;
    border-radius: 5px 5px 0 0;
    transition: all 0.15s ease;

    /* Default: faded empty month */
    color: rgba(96, 96, 120, 0.5);
    background: linear-gradient(180deg, #16161f 0%, #111119 100%);
    /* Plastic bevel */
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.03),
        inset 1px 0 0 rgba(255, 255, 255, 0.02),
        inset -1px 0 0 rgba(0, 0, 0, 0.15);
}

/* Subtle quarter-color tinting on the tab edges — like real colored dividers */
.planner-divider:nth-child(-n+3) {
    border-block-start: 2px solid rgba(180, 60, 80, 0.15);
}
.planner-divider:nth-child(n+4):nth-child(-n+6) {
    border-block-start: 2px solid rgba(60, 140, 80, 0.15);
}
.planner-divider:nth-child(n+7):nth-child(-n+9) {
    border-block-start: 2px solid rgba(60, 100, 180, 0.15);
}
.planner-divider:nth-child(n+10) {
    border-block-start: 2px solid rgba(180, 140, 60, 0.15);
}

.planner-divider:hover {
    color: var(--text-secondary);
    background: linear-gradient(180deg, #1c1c2a 0%, #151520 100%);
}

/* Months that have entries: tab looks "used" — bolder, more visible */
.planner-divider--has-entries {
    color: var(--text-secondary);
    background: linear-gradient(180deg, #1a1a28 0%, #141420 100%);
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.05),
        inset 1px 0 0 rgba(255, 255, 255, 0.03),
        inset -1px 0 0 rgba(0, 0, 0, 0.2);
}

/* Quarter tinting stronger on has-entries */
.planner-divider--has-entries:nth-child(-n+3) {
    border-block-start-color: rgba(180, 60, 80, 0.35);
}
.planner-divider--has-entries:nth-child(n+4):nth-child(-n+6) {
    border-block-start-color: rgba(60, 140, 80, 0.35);
}
.planner-divider--has-entries:nth-child(n+7):nth-child(-n+9) {
    border-block-start-color: rgba(60, 100, 180, 0.35);
}
.planner-divider--has-entries:nth-child(n+10) {
    border-block-start-color: rgba(180, 140, 60, 0.35);
}

/* Active month: tab is "pulled forward" — connects to the page */
.planner-divider--active {
    color: var(--cyan);
    background: linear-gradient(180deg, #1a1a2a 0%, #12121c 100%);
    z-index: 1;
    /* Remove bottom edge so it flows into the calendar */
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.06),
        inset 1px 0 0 rgba(255, 255, 255, 0.04),
        inset -1px 0 0 rgba(0, 0, 0, 0.2),
        0 2px 0 #12121c;
    padding-block-start: 0.6rem;
    margin-block-start: -0.1rem;
}

/* Active quarter tinting at full strength */
.planner-divider--active:nth-child(-n+3) {
    border-block-start-color: rgba(180, 60, 80, 0.6);
}
.planner-divider--active:nth-child(n+4):nth-child(-n+6) {
    border-block-start-color: rgba(60, 140, 80, 0.6);
}
.planner-divider--active:nth-child(n+7):nth-child(-n+9) {
    border-block-start-color: rgba(60, 100, 180, 0.6);
}
.planner-divider--active:nth-child(n+10) {
    border-block-start-color: rgba(180, 140, 60, 0.6);
}

/* --- Calendar Containers --- */
.planner-calendar {
    display: none;
    padding: 1.5rem 2rem 2rem;
}

.planner-calendar--active {
    display: block;
}

/* --- Calendar Header (Day Names) --- */
.calendar-header {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 1px;
    margin-block-end: 1px;
}

.calendar-header span {
    font-family: 'Courier New', 'Lucida Console', monospace;
    font-size: 0.6875rem;
    color: var(--text-dim);
    text-align: center;
    padding: 0.5rem 0.25rem;
    letter-spacing: 0.08em;
}

/* --- Calendar Grid --- */
.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 1px;
    background-color: rgba(100, 100, 160, 0.08);
}

/* --- Calendar Day Cells --- */
.calendar-day {
    aspect-ratio: 1 / 1;
    background-color: #12121c;
    padding: 0.4rem;
    display: flex;
    flex-direction: column;
    font-family: 'Courier New', 'Lucida Console', monospace;
}

.calendar-day--empty {
    background-color: #10101a;
}

.day-number {
    font-size: 0.8125rem;
    color: var(--text-dim);
}

/* --- Days With Entries --- */
.day-has-entry {
    text-decoration: none;
    transition: background-color 0.2s ease;
}

.day-has-entry .day-number {
    color: var(--cyan);
}

.day-has-entry .day-title {
    font-size: 0.5625rem;
    color: var(--cyan-dim);
    margin-block-start: auto;
    line-height: 1.3;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

.day-has-entry:hover {
    background-color: #1a1a2a;
}

.day-has-entry:hover .day-number {
    color: var(--accent);
}

.day-has-entry:hover .day-title {
    color: var(--accent);
}

/* --- Planner Page (Entry View) --- */
.planner-page {
    position: relative;
    padding: 2rem 2rem 2rem 3rem;
    /* Grid paper: horizontal + vertical lines */
    background-color: #12121c;
    background-image:
        /* Vertical lines */
        repeating-linear-gradient(
            to right,
            transparent,
            transparent calc(2rem - 1px),
            rgba(100, 100, 160, 0.08) calc(2rem - 1px),
            rgba(100, 100, 160, 0.08) 2rem
        ),
        /* Horizontal lines */
        repeating-linear-gradient(
            to bottom,
            transparent,
            transparent calc(1.65em - 1px),
            rgba(100, 100, 160, 0.08) calc(1.65em - 1px),
            rgba(100, 100, 160, 0.08) 1.65em
        );
    background-size: 2rem 100%, 100% 1.65em;
    background-attachment: local;
    line-height: 1.65;
}

/* Three-hole punch */
.planner-page::before {
    content: "";
    position: absolute;
    inset-inline-start: 0.75rem;
    inset-block-start: 15%;
    block-size: 70%;
    inline-size: 10px;
    background:
        radial-gradient(circle at center, #0a0a0f 4px, transparent 4px) center 0% / 10px 10px no-repeat,
        radial-gradient(circle at center, #0a0a0f 4px, transparent 4px) center 50% / 10px 10px no-repeat,
        radial-gradient(circle at center, #0a0a0f 4px, transparent 4px) center 100% / 10px 10px no-repeat;
    pointer-events: none;
}

/* --- Date Header --- */
.planner-date-header {
    display: flex;
    flex-direction: column;
    border-inline-start: 3px solid var(--cyan-dim);
    padding-inline-start: 0.75rem;
    margin-block-end: 2rem;
}

.planner-day-name {
    font-family: 'Courier New', 'Lucida Console', monospace;
    font-size: 1.25rem;
    font-weight: bold;
    color: var(--accent);
    letter-spacing: 0.1em;
    line-height: 1.3;
}

.planner-full-date {
    font-family: 'Courier New', 'Lucida Console', monospace;
    font-size: 0.875rem;
    color: var(--text-secondary);
    letter-spacing: 0.05em;
}

/* --- Entry Content --- */
.planner-entry {
    margin-block-end: 2rem;
}

.planner-entry p {
    margin-block-end: 1rem;
    color: var(--text-primary);
}

.planner-entry p:last-child {
    margin-block-end: 0;
}

/* Markdown heading styles */
.planner-entry h1,
.planner-entry h2,
.planner-entry h3 {
    font-family: 'Courier New', 'Lucida Console', monospace;
    color: var(--accent);
    letter-spacing: 0.05em;
    margin-block: 1.5rem 0.75rem;
}

.planner-entry h1 { font-size: 1.25rem; }
.planner-entry h2 { font-size: 1.1rem; }
.planner-entry h3 { font-size: 1rem; color: var(--text-secondary); }

/* Inline styles */
.planner-entry strong {
    color: var(--accent);
    font-weight: bold;
}

.planner-entry em {
    font-style: italic;
    color: var(--text-secondary);
}

.planner-entry a {
    color: var(--cyan);
}

.planner-entry a:hover {
    color: var(--accent);
}

/* Code */
.planner-entry code {
    font-family: 'Courier New', 'Lucida Console', monospace;
    font-size: 0.9em;
    color: var(--cyan);
    background-color: rgba(0, 229, 255, 0.06);
    padding: 0.1em 0.3em;
    border-radius: 2px;
}

.planner-entry pre {
    background-color: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(100, 100, 160, 0.15);
    padding: 1rem;
    overflow-x: auto;
    margin-block: 1rem;
}

.planner-entry pre code {
    background: none;
    padding: 0;
}

/* Blockquote */
.planner-entry blockquote {
    border-inline-start: 3px solid rgba(100, 100, 160, 0.3);
    padding-inline-start: 1rem;
    margin-inline: 0;
    margin-block: 1rem;
    color: var(--text-dim);
    font-style: italic;
}

/* Lists */
.planner-entry ul,
.planner-entry ol {
    padding-inline-start: 1.5rem;
    margin-block: 0.75rem;
    color: var(--text-primary);
}

.planner-entry li {
    margin-block-end: 0.35rem;
}

.planner-entry ul { list-style-type: disc; }
.planner-entry ol { list-style-type: decimal; }

/* Horizontal rule */
.planner-entry hr {
    border: none;
    border-block-start: 1px solid rgba(100, 100, 160, 0.2);
    margin-block: 1.5rem;
}

/* --- Section Labels --- */
.planner-section-label {
    font-family: 'Courier New', 'Lucida Console', monospace;
    font-size: 0.6875rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.15em;
    text-decoration: underline;
    text-underline-offset: 3px;
    text-decoration-color: rgba(100, 100, 160, 0.3);
    margin-block-end: 0.75rem;
    text-shadow: none;
}

/* --- Notes Section --- */
.planner-notes {
    margin-block-start: 2rem;
    padding-block-start: 1rem;
    border-block-start: 1px solid rgba(100, 100, 160, 0.1);
}

.planner-notes p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    margin-block-end: 1rem;
}

/* --- Navigation --- */
.planner-nav {
    margin-block-start: 3rem;
    padding-block-start: 1rem;
    border-block-start: 1px solid rgba(100, 100, 160, 0.1);
}

.planner-nav a {
    font-family: 'Courier New', 'Lucida Console', monospace;
    font-size: 0.875rem;
    color: var(--cyan-dim);
}

/* --- Responsive — Medium --- */
@media screen and (max-width: 50rem) {
    .logbook {
        padding: 1rem 0.75rem;
    }

    .planner-binding {
        --coil-edge: 1.5rem;
        --coil-overlap: 0.35rem;
    }

    .planner-cover {
        padding: 1.5rem 1.5rem 0.75rem;
    }

    .planner-calendar {
        padding: 1rem 1.5rem 1.5rem;
    }

    .planner-dividers {
        padding-inline: 1.5rem;
    }

    .planner-year-label {
        padding-inline: 1.5rem;
    }

    .calendar-day {
        aspect-ratio: auto;
        min-block-size: 3rem;
    }

    .planner-page {
        padding: 1.5rem 1.5rem 1.5rem 2.5rem;
    }
}

/* --- Responsive — Small --- */
@media screen and (max-width: 30rem) {
    .logbook {
        padding: 0.5rem 0.25rem;
    }

    .planner-binding {
        display: none;
    }

    .planner-cover {
        padding: 1rem;
    }

    .planner-cover h1 {
        font-size: 1.5rem;
    }

    .planner-calendar {
        padding: 0.75rem 1rem 1rem;
    }

    .planner-dividers {
        padding-inline: 0.75rem;
    }

    .planner-divider {
        padding: 0.35rem 0 0.25rem;
        font-size: 0.5rem;
        border-radius: 3px 3px 0 0;
    }

    .planner-year-label {
        padding-inline: 1rem;
    }

    .calendar-header span {
        font-size: 0.5625rem;
    }

    .calendar-day {
        padding: 0.25rem;
        min-block-size: 2.5rem;
    }

    .day-number {
        font-size: 0.6875rem;
    }

    .day-has-entry .day-title {
        font-size: 0.5rem;
    }

    .planner-page {
        padding: 1rem;
    }

    /* Hide punch holes on small screens */
    .planner-page::before {
        display: none;
    }
}

/* --- Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
    .logbook::before {
        animation: none;
    }
}